subject:(Titanium Alloys Microstructure)

Indian Institute of Science

1. Nair, Shanoob Balachandran. Effect of Thermomechanical Processing on Microstructure And Microtexture Evolution in Titanium Alloys.

Degree: PhD, Faculty of Engineering, 2017, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/2678

► The properties of titanium alloys are based on alloy compositions and microstructures that consist of mixtures of the two allotropic modifications of titanium, the low… (more)

▼ The properties of titanium alloys are based on alloy compositions and microstructures that consist of mixtures of the two allotropic modifications of titanium, the low temperature α (hcp) and the high temperature β (bcc) phases. This thesis deals with the hot working behaviour of three commercial titanium alloy compositions designated IMI834, Ti17 and Ti5553 with a focus and detailed analysis of the Ti5553 alloy. These alloys represent the differing uses of titanium alloys in the aerospace industry. IMI834 is a near α alloy used in high temperature creep resistant applications as compressor discs and blades in aeroengines. Ti17 is a high strength alloy α+β used at intermediate temperatures in fan and compressor discs of aeroengines, while Ti5553 is a high strength-high toughness metastable β alloy used in the undercarriages of aircraft. The three alloys have widely differing β transus temperatures (related to α phase stability) and compositions. Titanium alloys are vacuum arc melted and thermomechanically processed. This process involves ingot breakdown in β (bcc) phase, and subsequent thermomechanical processing in two-phase α+β (hcp+bcc) region at temperatures that typically involve volume fractions of α in lath or plate form ranging from 15% to about 30%. The thermomechanical processing breaks down lath α to spheroidal particles, a process known as globularisation. Chapter I of this thesis reviews the current understanding of the hot working of titanium alloys and microstructure evolution during the hot working process. Chapter II summarises the main experimental techniques used: the hot compression test, and subsequent microstructure and microtexture analysis by scanning electron microscopy and related electron back scattered diffraction techniques (EBSD), transmission electron microscopy and related precession electron diffraction techniques (PED) for orientation imaging. The starting structure in the α+β domain of hot work is generally not a random distribution of the 12 variant Burgers Orientation Relationship (BOR) between the α and β phases, (11̅0)β || (0001)α and <111>β || <112̅0>α . A variety of morphologies and distributions ranging from the typical colony structures of near α and α+β alloys to the fine distributions of variants arranged in a triangular fashion are observed with specific growth directions and habit planes. Chapter III describes a quantitative evaluation of α distribution that are typical of some of the starting structures for the hot working conditions used in this thesis, specifically in the Ti5553 alloy. For this purpose, a Matlab based script has been developed to measure the spatially correlated misorientation distribution. It was found that experimental spatially correlated misorientation distribution varies significantly from a random frequency for both pair and triplet wise distribution of α laths. The analysis of these structures by established techniques of analysis of self-accommodated structures based on strain energy minimisation shows that the observed variant… Advisors/Committee Members: Banerjee, Dipankar (advisor).

Subjects/Keywords: Titanium Alloys; Titanium Alloys Microstructure; Titanium Alloys Microtexture; Microstructure Evolution; Ti5553 Alloy; Materials Engineering

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APA (6^th Edition):

Nair, S. B. (2017). Effect of Thermomechanical Processing on Microstructure And Microtexture Evolution in Titanium Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2678

Chicago Manual of Style (16^th Edition):

Nair, Shanoob Balachandran. “Effect of Thermomechanical Processing on Microstructure And Microtexture Evolution in Titanium Alloys.” 2017. Doctoral Dissertation, Indian Institute of Science. Accessed January 23, 2021. http://etd.iisc.ac.in/handle/2005/2678.

MLA Handbook (7^th Edition):

Nair, Shanoob Balachandran. “Effect of Thermomechanical Processing on Microstructure And Microtexture Evolution in Titanium Alloys.” 2017. Web. 23 Jan 2021.

Vancouver:

Nair SB. Effect of Thermomechanical Processing on Microstructure And Microtexture Evolution in Titanium Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2017. [cited 2021 Jan 23]. Available from: http://etd.iisc.ac.in/handle/2005/2678.

Council of Science Editors:

Nair SB. Effect of Thermomechanical Processing on Microstructure And Microtexture Evolution in Titanium Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2017. Available from: http://etd.iisc.ac.in/handle/2005/2678

Indian Institute of Science

2. Sen, Indrani. Mechanical Behavior Of B-Modified Ti-6Al-4V Alloys.

Degree: PhD, Faculty of Engineering, 2011, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/1430

► Titanium alloys are important engineering alloys that are extensively used in various industries. This is due to their unique combination of mechanical and physical properties… (more)

▼ Titanium alloys are important engineering alloys that are extensively used in various industries. This is due to their unique combination of mechanical and physical properties such as low density combined with high strength and toughness as well as outstanding corrosion resistance. An additional benefit associated with Ti alloys, in general, is that their properties are relatively temperature-insensitive between cryogenic temperature and ~500 °C. Amongst the Ti alloys, Ti-6Al-4V (referred as Ti64) is a widely used alloy. Conventionally cast Ti64 possesses classical Widmanstätten microstructure of (hcp) α and (bcc) β phases. However this microstructure suffers from large prior β grain size, which tends be in the order of a few mm. Such large grain sizes are associated with poor processability as well as inferior mechanical performance. The necessity to break this coarse as-cast microstructure down, through several successive thermo-mechanical processing steps, adds considerably to the cost of finished Ti alloy products, making them expensive vis-à-vis other competing alloys. The addition of small amount of B (~0.1%) to Ti64 alloys, on the other hand reduces the cast grain size from couple of mm to ~200 µm. Moreover, addition of B to Ti alloys produces the intermetallic TiB needles during solidification by an in situ chemical reaction. The overall objective of this work is to gain insights into the role of microstructural modifications, induced by B addition to Ti64, on the mechanical performance of the alloys, in particular the room temperature damage tolerance (fracture toughness and fatigue crack growth) characteristics. The key questions we seek to answer through this study are the following: (a) What role does the microstructural refinement plays on the quasistatic as well as fracture and fatigue behavior and high temperature deformability of the alloys? (c) A hierarchy of microstructural length scales exist in Ti alloys. These are the lath, colony and grain sizes. Which of these microstructural parameters control the mechanical performance of the alloy? (b) What (possibly detrimental) role, if any, do the TiB needles play in influencing the mechanical performance of Ti64 alloys? This is because TiB being much stiffer, strain incompatibility between the matrix and the TiB phase could lead to easy nucleation of cracks during cyclic loading as well as can pose problems during dynamic deformation. (d) What is the optimum amount of B that can be added to Ti64 such that the most desirable combination of properties can be achieved? Five B-modified Ti64 alloys with B content varying from 0.0 to 0.55 wt.% were utilised to answer the above questions. Marked prior β grain size reduction was noted with up to 0.1 wt.% B addition. Simultaneous refinement of α/β colony size has also been observed. The addition of B to Ti64, on the other hand increases the α lath size. The TiB needles that form in-situ during casting are arranged in a necklace like structure surrounding the grain boundaries for higher B added Ti64 alloys. An… Advisors/Committee Members: Ramamurty, U (advisor).

Subjects/Keywords: Titanium Alloys - Mechanical Properties; Titanium Alloys - Fatigue; Titanium Alloys - Aerospace Applications; Titaniuim Alloys - Deformation; Titanium Alloys - Microstructure; Titanium Alloys - Tensile Behavior; Fracture Mechanics; Ti Alloys; Metallurgy

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APA (6^th Edition):

Sen, I. (2011). Mechanical Behavior Of B-Modified Ti-6Al-4V Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/1430

Chicago Manual of Style (16^th Edition):

Sen, Indrani. “Mechanical Behavior Of B-Modified Ti-6Al-4V Alloys.” 2011. Doctoral Dissertation, Indian Institute of Science. Accessed January 23, 2021. http://etd.iisc.ac.in/handle/2005/1430.

MLA Handbook (7^th Edition):

Sen, Indrani. “Mechanical Behavior Of B-Modified Ti-6Al-4V Alloys.” 2011. Web. 23 Jan 2021.

Vancouver:

Sen I. Mechanical Behavior Of B-Modified Ti-6Al-4V Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2011. [cited 2021 Jan 23]. Available from: http://etd.iisc.ac.in/handle/2005/1430.

Council of Science Editors:

Sen I. Mechanical Behavior Of B-Modified Ti-6Al-4V Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2011. Available from: http://etd.iisc.ac.in/handle/2005/1430

Hong Kong University of Science and Technology

3. Hua, Peng MAE. Cyclic deformation behavior of NiTi shape memory alloys at microscale.

Degree: 2019, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-98392 ; https://doi.org/10.14711/thesis-991012699268203412 ; http://repository.ust.hk/ir/bitstream/1783.1-98392/1/th_redirect.html

► The superelastic cyclic deformation behavior of nanocrystalline NiTi at microscale is investigated. Cuboidal micropillars with sizes of 2 μm to 500 nm are fabricated by… (more)

Subjects/Keywords: Shape memory alloys ; Microstructure ; Elastic properties ; Nickel-titanium alloys ; Nanocrystals

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APA (6^th Edition):

Hua, P. M. (2019). Cyclic deformation behavior of NiTi shape memory alloys at microscale. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-98392 ; https://doi.org/10.14711/thesis-991012699268203412 ; http://repository.ust.hk/ir/bitstream/1783.1-98392/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hua, Peng MAE. “Cyclic deformation behavior of NiTi shape memory alloys at microscale.” 2019. Thesis, Hong Kong University of Science and Technology. Accessed January 23, 2021. http://repository.ust.hk/ir/Record/1783.1-98392 ; https://doi.org/10.14711/thesis-991012699268203412 ; http://repository.ust.hk/ir/bitstream/1783.1-98392/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hua, Peng MAE. “Cyclic deformation behavior of NiTi shape memory alloys at microscale.” 2019. Web. 23 Jan 2021.

Vancouver:

Hua PM. Cyclic deformation behavior of NiTi shape memory alloys at microscale. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2019. [cited 2021 Jan 23]. Available from: http://repository.ust.hk/ir/Record/1783.1-98392 ; https://doi.org/10.14711/thesis-991012699268203412 ; http://repository.ust.hk/ir/bitstream/1783.1-98392/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hua PM. Cyclic deformation behavior of NiTi shape memory alloys at microscale. [Thesis]. Hong Kong University of Science and Technology; 2019. Available from: http://repository.ust.hk/ir/Record/1783.1-98392 ; https://doi.org/10.14711/thesis-991012699268203412 ; http://repository.ust.hk/ir/bitstream/1783.1-98392/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

4. Babu, R Prasath. Microstructural Stability of Fully Lamellar and Duplex y-TiAl Alloys During Creep.

Degree: PhD, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/3234

► γ-TiAl based alloys have attracted considerable research interest in the past few decades and have gained niche high temperature applications in aero-engines and automobiles. As… (more)

▼ γ-TiAl based alloys have attracted considerable research interest in the past few decades and have gained niche high temperature applications in aero-engines and automobiles. As high temperature structural materials, these alloys require stable microstructures. This thesis aims at addressing knowledge gaps in the understanding of microstructural stability in two technologically important γ-TiAl based alloys in different microstructures, viz. fully lamellar (FL) and duplex. Creep and exposure tests were complemented with a variety of microstructural characterization tools (SEM, EBSD, TEM, XRD). Density functional theory based calculations were also performed to further the understanding of stability of phases. In the first part of the thesis, microstructural stability of a FL microstructure was studied under creep and high temperature exposure conditions. An aim of these studies was to probe the effect of stress orientation with respect to lamellar plates on microstructural changes during primary creep. It was observed that retention of excess α2 resulted in an unstable microstructure and so under stress and temperature, excess α2 was lost. However, depending on stress orientation, the sequence of precipitates formed was different. In particular, for certain stress orientations, the formation of the non-equilibrium C14 phase was observed. The stress dependence of microstructural evolution was found to be stem from internal stresses due to lattice misfit and elastic moduli mismatch between α2 and γ. In the second part of this thesis, microstructural stability of a duplex alloy was probed, with an emphasis on understanding mechanisms that lead to tertiary creep. The as-extruded microstructure consisted of bands of equiaxed grains and lamellar grains. During creep, loss of lamellar grains was observed and this was attended by kinking of laths and formation of dynamically recrystallized equiaxed grains. Significant dislocation activity was seen in both lamellar and equiaxed grains at all stages of creep. Initially, dislocation activity leads to strengthening and primary creep behavior, but at later stages, it triggers dynamic recrystallization. Dynamic recrystallization was found to be the rate controlling creep mechanism. Accelerating creep behavior was due to strain localization during the constant load tensile test resulting from microstructural instabilities such as kinking. Advisors/Committee Members: Karthikeyan, S (advisor).

Subjects/Keywords: Titanium Alluminide Alloys; Titanium Alluminide Alloys - Creep; Titanium Alluminide Alloys - Microstructural Stability; Fully Lamellar Microstructure; Duplex Microstructure - Stabililty; Duplex Titanium Alluminide Alloys; Fully Lamellar Titanium Alluminide Alloys; γ-TiAl Alloys; Creep; Metallurgy

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APA (6^th Edition):

Babu, R. P. (2018). Microstructural Stability of Fully Lamellar and Duplex y-TiAl Alloys During Creep. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3234

Chicago Manual of Style (16^th Edition):

Babu, R Prasath. “Microstructural Stability of Fully Lamellar and Duplex y-TiAl Alloys During Creep.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 23, 2021. http://etd.iisc.ac.in/handle/2005/3234.

MLA Handbook (7^th Edition):

Babu, R Prasath. “Microstructural Stability of Fully Lamellar and Duplex y-TiAl Alloys During Creep.” 2018. Web. 23 Jan 2021.

Vancouver:

Babu RP. Microstructural Stability of Fully Lamellar and Duplex y-TiAl Alloys During Creep. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 23]. Available from: http://etd.iisc.ac.in/handle/2005/3234.

Council of Science Editors:

Babu RP. Microstructural Stability of Fully Lamellar and Duplex y-TiAl Alloys During Creep. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3234

Colorado School of Mines

5. Tello Araya, Karem Eva. Phase transformations and equilibria of titanium platinum alloys in the composition range 30-50 atomic percent platinum.

Degree: PhD, Metallurgical and Materials Engineering, 2012, Colorado School of Mines

URL: http://hdl.handle.net/11124/76823

► The Ti-Pt phase binary phase diagram and the corresponding phase transformations in the composition range 30-50 at.percent Pt have been investigated using a variety of… (more)

▼ The Ti-Pt phase binary phase diagram and the corresponding phase transformations in the composition range 30-50 at.percent Pt have been investigated using a variety of characterization methods (DTA, SEM and TEM). This study was inspired by ongoing work on some experimental Ti-Ni-Pt and Ti-Pt-Ni-Hf high temperature shape memory alloys that were found to contain unexpected phases not reported previously in such alloys. Furthermore, close analysis of the peritectoid invariant proposed by Biggs et al. revealed a range of confusing and somewhat contradictory results and, as a result, it was decided to attempt to determine the true nature of the diagram in this composition range and to understand the complicating effects of interstitial contamination on the observed microstructures and phase equilibria. The microstructure of as-cast and heat treated alloys contains more than two phases after equilibration treatments suggesting interstitial contamination. In addition, the microstructures revealed that the peritectoid transformation (Ti3Pt plus TiPt Ti4Pt3) proposed in the literature exists but, because of sluggish transformation kinetics, the actual peritectoid reaction is limited and does not account for the observed DTA peaks that Biggs et al. used to estimate the invariant temperature. Rather, it will be shown that the peaks are due to the transformation of TiPt to a lamellar TiPt plus Ti4Pt3 structure at approximately 1230 degrees C. In addition, a modification to the phase diagram is proposed based on other experimental evidence. Characterization of the various phases observed in the microstructures (using SADP and CBED in the TEM) confirmed the presence of the known phases Ti3Pt and TiPt. In addition, a new phase with stoichiometry Ti5Pt3 was observed in both as-cast and heat treated samples. This phase is shown to be stabilized by oxygen and to have a hexagonal structure with lattice parameters a approx. 8.0 nm and c approx. 5:0 nm (space group P63/mcm). The Ti4Pt3 phase appears to be a true binary phase that tends to be highly faulted and be structurally related to the Ti4Pt3 phase with a pseudo-hexagonal structure with a approx. 7.96 nm and c approx. 23.6 nm. Detailed electron diffraction evidence indicates that the crystal structure is probably triclinic although it was difficult to determine the actual point and space group. Advisors/Committee Members: Kaufman, Michael J. (advisor), Gorman, Brian P. (committee member), Liu, Stephen (committee member), Speer, J. G. (committee member), Ohno, Timothy R. (committee member).

Subjects/Keywords: microstructure formation mechanism; high temperature shape memory alloys; titanium-platinum alloys; phase transfromations; phase diagram; phase characterization; Shape memory alloys; Titanium alloys; Phase diagrams; Steel – Microstructure

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APA (6^th Edition):

Tello Araya, K. E. (2012). Phase transformations and equilibria of titanium platinum alloys in the composition range 30-50 atomic percent platinum. (Doctoral Dissertation). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/76823

Chicago Manual of Style (16^th Edition):

Tello Araya, Karem Eva. “Phase transformations and equilibria of titanium platinum alloys in the composition range 30-50 atomic percent platinum.” 2012. Doctoral Dissertation, Colorado School of Mines. Accessed January 23, 2021. http://hdl.handle.net/11124/76823.

MLA Handbook (7^th Edition):

Tello Araya, Karem Eva. “Phase transformations and equilibria of titanium platinum alloys in the composition range 30-50 atomic percent platinum.” 2012. Web. 23 Jan 2021.

Vancouver:

Tello Araya KE. Phase transformations and equilibria of titanium platinum alloys in the composition range 30-50 atomic percent platinum. [Internet] [Doctoral dissertation]. Colorado School of Mines; 2012. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11124/76823.

Council of Science Editors:

Tello Araya KE. Phase transformations and equilibria of titanium platinum alloys in the composition range 30-50 atomic percent platinum. [Doctoral Dissertation]. Colorado School of Mines; 2012. Available from: http://hdl.handle.net/11124/76823

Georgia Tech

6. Lieberman, Scott Ian. Microstructural Characterization, Visualization, and Simulation of Ti-B Materials.

Degree: PhD, Materials Science and Engineering, 2007, Georgia Tech

URL: http://hdl.handle.net/1853/14578

► Additions of boron in modified titanium alloys and Ti-B composites result in the in situ formation during high temperature processing of TiB reinforcement phases that… (more)

▼ Additions of boron in modified titanium alloys and Ti-B composites result in the in situ formation during high temperature processing of TiB reinforcement phases that improve the mechanical properties and wear resistance of unreinforced titanium alloys, while still utilizing the high strength-to-weight ratio and excellent corrosion resistance of titanium. Several boron-modified titanium alloys and Ti-B composites in a Ti-6Al-4V matrix have been investigated to determine the effect of processing parameters on the TiB reinforcement phases and resultant microstructures and mechanical properties. Using optical microscopy, scanning electron microscopy, conventional characterization techniques, and newly developed methodologies for three-dimensional visualization, the microstructures of these Ti-B materials have been studied. Observations included a similar anisotropic whisker morphology with roughly hexagonal cross-sections among all TiB phases; alignment of all TiB phases with extrusion, with the extent of alignment affected by thermomechanical processing parameters; brittle fracture behavior of TiB whiskers, with fracture down the length of whiskers not aligned in the tensile direction and across the width of whiskers aligned in the tensile direction; and discoveries of the anisotropic morphologies of the coarse primary TiB phase and the sub-micron precipitated TiB phase. It has been observed that extruded boron-modified alloys with compositions in the hypoeutectic regime of the quaternary system of titanium, alloying elements aluminum and vanadium, and boron, containing a unimodal size distribution of eutectic TiB whiskers, significantly improve the strength and stiffness compared to unreinforced Ti-6Al-4V alloy while also demonstrating tensile elongation to failure within the fracture-critical limits required for aerospace structural applications. Materials design methodologies have been developed using Ti-B materials, and they show promise for predicting the effects of processing parameters and the resultant microstructures and mechanical properties for boron-modified titanium alloys and Ti-B composites optimized for a variety of commercial and industrial applications. Advisors/Committee Members: Gokhale, Arun (Committee Chair), Garmestani, Hamid (Committee Member), Graham, Samuel (Committee Member), Kurtis, Kimberly (Committee Member), McDowell, David (Committee Member).

Subjects/Keywords: titanium alloys; three-dimensional microstructure

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APA (6^th Edition):

Lieberman, S. I. (2007). Microstructural Characterization, Visualization, and Simulation of Ti-B Materials. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/14578

Chicago Manual of Style (16^th Edition):

Lieberman, Scott Ian. “Microstructural Characterization, Visualization, and Simulation of Ti-B Materials.” 2007. Doctoral Dissertation, Georgia Tech. Accessed January 23, 2021. http://hdl.handle.net/1853/14578.

MLA Handbook (7^th Edition):

Lieberman, Scott Ian. “Microstructural Characterization, Visualization, and Simulation of Ti-B Materials.” 2007. Web. 23 Jan 2021.

Vancouver:

Lieberman SI. Microstructural Characterization, Visualization, and Simulation of Ti-B Materials. [Internet] [Doctoral dissertation]. Georgia Tech; 2007. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1853/14578.

Council of Science Editors:

Lieberman SI. Microstructural Characterization, Visualization, and Simulation of Ti-B Materials. [Doctoral Dissertation]. Georgia Tech; 2007. Available from: http://hdl.handle.net/1853/14578

University of North Texas

7. Gray, Alyn M. An Initial Study of Binary and Ternary Ti-based Alloys Manufactured Using Laser Engineered Net Shaping (LENSTM).

Degree: 2015, University of North Texas

URL: https://digital.library.unt.edu/ark:/67531/metadc822823/

► In this study an initial assessment of the composition – microstructure – property relationships in binary and ternary Ti – based systems are made possible… (more)

Subjects/Keywords: LENSTM; titanium; microstructure; composition; iron; tungsten; aluminum; molybdenum; Titanium alloys.; Lasers – Industrial applications.; Manufacturing processes.

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APA (6^th Edition):

Gray, A. M. (2015). An Initial Study of Binary and Ternary Ti-based Alloys Manufactured Using Laser Engineered Net Shaping (LENSTM). (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc822823/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gray, Alyn M. “An Initial Study of Binary and Ternary Ti-based Alloys Manufactured Using Laser Engineered Net Shaping (LENSTM).” 2015. Thesis, University of North Texas. Accessed January 23, 2021. https://digital.library.unt.edu/ark:/67531/metadc822823/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gray, Alyn M. “An Initial Study of Binary and Ternary Ti-based Alloys Manufactured Using Laser Engineered Net Shaping (LENSTM).” 2015. Web. 23 Jan 2021.

Vancouver:

Gray AM. An Initial Study of Binary and Ternary Ti-based Alloys Manufactured Using Laser Engineered Net Shaping (LENSTM). [Internet] [Thesis]. University of North Texas; 2015. [cited 2021 Jan 23]. Available from: https://digital.library.unt.edu/ark:/67531/metadc822823/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gray AM. An Initial Study of Binary and Ternary Ti-based Alloys Manufactured Using Laser Engineered Net Shaping (LENSTM). [Thesis]. University of North Texas; 2015. Available from: https://digital.library.unt.edu/ark:/67531/metadc822823/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

8. Roy, Shibayan. Role Of Boron On The Evolution Of Microstructure And Texture In Ti-6AL-4V-0.1B Alloy.

Degree: PhD, Faculty of Engineering, 2013, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/2025

► Titanium and its alloys constitute an important class of materials for aerospace, biomedical, and chemical industries, primarily due to their high specific strength and fracture… (more)

▼ Titanium and its alloys constitute an important class of materials for aerospace, biomedical, and chemical industries, primarily due to their high specific strength and fracture toughness with good corrosion resistance. Owing to their hexagonal crystal structure at room temperature, both microstructure and texture play a crucial role in the processing and hence the properties of titanium alloys. The basis for tailoring the microstructure and texture in titanium alloys centers around the transformation of high temperature β (body-centered cubic) to the low temperature α (hexagonal close packed) phase. One of the most widely used titanium alloy is Ti-6Al-4V, which exists as two phase (α+β) alloy at room temperature. The cast structure of the alloy Ti-6Al-4V is generally coarse and has strong solidification texture that leads to inferior properties. Recently, trace boron addition has been reported to produce substantial refinement in cast microstructure for Ti-6Al-4V. Significant improvements in some of the mechanical properties have been reported for the Ti-6Al-4V-0.1B alloy in the as-cast condition. The reasons for microstructural refinement in the boron modified alloy and associated improvements in properties, however, needs to be investigated since the property attributes strongly depend on finer microstructural details including crystallographic texture. In addition, the titanium alloys are processed through thermo-mechanical treatments that involve deformation and annealing response of the alloy. The effect of boron modification on the processing response during thermo-mechanical treatments (TMP) has also not been studied. All these aspects shape the framework of the thesis, wherein microstructure and texture evolution is probed from starting cast condition through different stages of TMP. Micro-mechanisms are identified at every stage from the interrelation of these two intrinsic factors. In the first part of the study, the spatial variation of microstructure and texture in the cast ingot has been studied using SEM-EBSD technique. It has been found that trace boron addition (0.1 wt%) to Ti-6Al-4V alloy ensures excellent microstructural homogeneity throughout the cast ingot. A subdued thermal gradient due to constitutional undercooling persists during solidification and maintains equivalent β grain growth kinetics at different locations in the ingot. For Ti-6Al-4V-0.1B alloy, both high temperature β and room temperature α phase textures weaken. The microstructural attributes of boron addition manifests as the absence of grain boundary α-phase and the presence of TiB particles. Both these features strongly affect the mechanism of β→α phase transformation and consequently weaken the α phase texture. The evolution of microstructure and texture during β-processing of Ti-6Al-4V-0.1B alloy is examined in the second part of the work. Boron modified alloy shows the typical features of β worked microstructure with fine prior β grains, however without the formation of shear bands, which is generally observed in the… Advisors/Committee Members: Suwas, Satyam (advisor).

Subjects/Keywords: Microstructure Evolution; Alloys; Titanium; Titanium Alloys; Ti-6Al-4V Alloy; Texture Evolution; Ti-6Al-4V-0.1B Alloy; Metallurgy

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APA (6^th Edition):

Roy, S. (2013). Role Of Boron On The Evolution Of Microstructure And Texture In Ti-6AL-4V-0.1B Alloy. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2025

Chicago Manual of Style (16^th Edition):

Roy, Shibayan. “Role Of Boron On The Evolution Of Microstructure And Texture In Ti-6AL-4V-0.1B Alloy.” 2013. Doctoral Dissertation, Indian Institute of Science. Accessed January 23, 2021. http://etd.iisc.ac.in/handle/2005/2025.

MLA Handbook (7^th Edition):

Roy, Shibayan. “Role Of Boron On The Evolution Of Microstructure And Texture In Ti-6AL-4V-0.1B Alloy.” 2013. Web. 23 Jan 2021.

Vancouver:

Roy S. Role Of Boron On The Evolution Of Microstructure And Texture In Ti-6AL-4V-0.1B Alloy. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2013. [cited 2021 Jan 23]. Available from: http://etd.iisc.ac.in/handle/2005/2025.

Council of Science Editors:

Roy S. Role Of Boron On The Evolution Of Microstructure And Texture In Ti-6AL-4V-0.1B Alloy. [Doctoral Dissertation]. Indian Institute of Science; 2013. Available from: http://etd.iisc.ac.in/handle/2005/2025

Indian Institute of Science

9. Suresh, K S. Evolution Of Texture And Microstructure In Some NiTi Based Alloys And Their Impact On Shape Memory Behavior.

Degree: PhD, Faculty of Engineering, 2015, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/2444

► NiTi based shape memory alloys (SMA) cover most of the commercially produced shape memory devices and components. The reversible martensitic transformation between the phases B2… (more)

▼ NiTi based shape memory alloys (SMA) cover most of the commercially produced shape memory devices and components. The reversible martensitic transformation between the phases B2 (austenite) and B19′ (martensite) is responsible for the shape memory effect in these alloys. The amount of strain which can be regained after a permanent deformation through thermal activation, known as the recoverable strain, is a strong function of crystallographic texture and microstructure. Texture influences the activation of a specific martensite variant during stress induced martensitic (SIM) transformation and also the re-orientation of twinned variants during further deformation. The variant selection decides the amount of recoverable strain. Since the NiTi based shape memory alloys inevitably undergo thermo-mechanical processing in the course of component design, the consequent evolution of texture and microstructure regulate the shape memory behavior. The present thesis is aimed to address this issue in some NiTi alloys that are technologically important for different applications, namely a binary Ni-rich NiTi alloy, a copper containing NiTi alloy and a hafnium containing NiTi alloy. The Ni rich NiTi alloy displays pseudoelastic behavior that can be used for couplings, the NiTiCu alloy provides a controlled thermal hysteresis suitable for actuator applications and the NiTiHf alloy can be used for high temperature applications. The first Chapter of the thesis provides a detailed overview of the existing knowledge related to evolution of microstructure and texture during processing, the transformation texture and its role on the shape memory behavior in NiTi alloys. The second chapter includes the experimental procedure followed to generate different textures, namely unidirectional and cross rolling with and without a subsequent annealing and also the details of the techniques used to characterize the structure, microstructure, texture and mechanical properties. The evolution of texture during thermo-mechanical processing of a Ni rich NiTi alloy and its impact on shape memory behavior is addressed in Chapter 3. The two modes of rolling employed at higher temperature led to the formation of different textures. The texture of unidirectionally rolled samples was characterized by a strong <111>||ND fiber, while a strong Goss {100}<110> component along with <111>||ND fiber was observed in the texture of the cross rolled samples. Annealing of the unidirectionally rolled samples generated a strong <100>||ND fiber, and a weak <111>||ND fiber was observed for the cross rolled samples. Microtexture analyses indicated that dynamically recrystallized grains had significantly different texture compared to the statically annealed material. One of the salient features of this study is the analysis of different twin boundaries with coincident site lattice (CSL) relations that has been observed in the hot rolled material. The origin of these twins has been attributed to deformation. The evolution of twin boundaries with CSL relation has strong… Advisors/Committee Members: Suwas, Satyam (advisor).

Subjects/Keywords: Nickel Alloys - Microstructure; Shape Memory Alloys (SMA); Nickel-Titanium Alloys; Nickel-Titanium Shape Memory Alloys; Nickel-Titanium Alloys - Evolution of Texture; Nickel-Titanium Alloys - Shape Memory Behavior; NiTi Alloys; Shape Memory Effect (SME); Metallurgy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Suresh, K. S. (2015). Evolution Of Texture And Microstructure In Some NiTi Based Alloys And Their Impact On Shape Memory Behavior. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2444

Chicago Manual of Style (16^th Edition):

Suresh, K S. “Evolution Of Texture And Microstructure In Some NiTi Based Alloys And Their Impact On Shape Memory Behavior.” 2015. Doctoral Dissertation, Indian Institute of Science. Accessed January 23, 2021. http://etd.iisc.ac.in/handle/2005/2444.

MLA Handbook (7^th Edition):

Suresh, K S. “Evolution Of Texture And Microstructure In Some NiTi Based Alloys And Their Impact On Shape Memory Behavior.” 2015. Web. 23 Jan 2021.

Vancouver:

Suresh KS. Evolution Of Texture And Microstructure In Some NiTi Based Alloys And Their Impact On Shape Memory Behavior. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2015. [cited 2021 Jan 23]. Available from: http://etd.iisc.ac.in/handle/2005/2444.

Council of Science Editors:

Suresh KS. Evolution Of Texture And Microstructure In Some NiTi Based Alloys And Their Impact On Shape Memory Behavior. [Doctoral Dissertation]. Indian Institute of Science; 2015. Available from: http://etd.iisc.ac.in/handle/2005/2444

Colorado School of Mines

10. Mitzner, Scott Vogel. Grain refinement and epitaxial interruption of freeform fabricated Ti-6Al-4V alloy.

Degree: MS(M.S.), Metallurgical and Materials Engineering, 2012, Colorado School of Mines

URL: http://hdl.handle.net/11124/170398

Subjects/Keywords: Titanium alloys – Microstructure; Fabrication; Grain boundaries

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APA (6^th Edition):

Mitzner, S. V. (2012). Grain refinement and epitaxial interruption of freeform fabricated Ti-6Al-4V alloy. (Masters Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170398

Chicago Manual of Style (16^th Edition):

Mitzner, Scott Vogel. “Grain refinement and epitaxial interruption of freeform fabricated Ti-6Al-4V alloy.” 2012. Masters Thesis, Colorado School of Mines. Accessed January 23, 2021. http://hdl.handle.net/11124/170398.

MLA Handbook (7^th Edition):

Mitzner, Scott Vogel. “Grain refinement and epitaxial interruption of freeform fabricated Ti-6Al-4V alloy.” 2012. Web. 23 Jan 2021.

Vancouver:

Mitzner SV. Grain refinement and epitaxial interruption of freeform fabricated Ti-6Al-4V alloy. [Internet] [Masters thesis]. Colorado School of Mines; 2012. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11124/170398.

Council of Science Editors:

Mitzner SV. Grain refinement and epitaxial interruption of freeform fabricated Ti-6Al-4V alloy. [Masters Thesis]. Colorado School of Mines; 2012. Available from: http://hdl.handle.net/11124/170398

Edith Cowan University

11. Rabadia, Chirag Dhirajlal. Microstructure and mechanical behavior of metastable beta type titanium alloys.

Degree: 2020, Edith Cowan University

URL: https://ro.ecu.edu.au/theses/2278

► Current biomaterials such as stainless steel, Co-Cr alloys, commercially pure titanium and Ti-6Al- 4V either possess poor mechanical compatibility and/or produce toxic effects in the… (more)

▼ Current biomaterials such as stainless steel, Co-Cr alloys, commercially pure titanium and Ti-6Al- 4V either possess poor mechanical compatibility and/or produce toxic effects in the human body after several years of usage. Consequently, there is an enormous demand for long-lasting biomaterials which provide a better combination of mechanical, corrosion and biological properties. In addition to this, alloys used in high-strength applications possess either high-strength or large plasticity. However, a high-strength alloy should possess a better blend of both strength and plasticity when used in high-strength applications. Metastable β-titanium alloys are the best suited alloys for biomedical and high-strength applications because they demonstrate a wide range of superior mechanical, corrosion and biological properties. In this PhD study, the Ti-27Nb-7Fe-xCr (x = 0, 2, 4, 6, 8 wt%) alloys using inexpensive elements (Fe, Mn, Cr etc.) have been designed to check their suitability for biomedical applications, whereas the Ti-33Zr-xFe-yCr (x = 3, 5, 7 and y = 2, 4 wt%), Ti-35Zr-5Fe-xMn (x = 0, 2, 4, 6, 8 wt%) and Ti-xZr-7Fe-ySn (x = 25, 30, 35 and y = 2, 4 wt%) alloys have been designed to check their suitability for high-strength applications. Later, all the investigated alloys have been cast using a cold crucible levitation melting technique. In the Ti-27Nb-7Fe-xCr alloys, only 2 wt% quantity of Cr is enough to retain a single β phase. Young’s moduli of the Ti-27Nb-7Fe-xCr alloys decrease from 116 GPa (in Ti-27Nb-7Fe) to 72 GPa (in Ti-27Nb-7Fe-8Cr) as the β stability improves. The Ti-33Zr-xFe-yCr alloys, except Ti- 33Zr-3Fe-2Cr alloy, demonstrate a C15 type Laves phase and a dominating β phase. Moreover, the Ti-35Zr-5Fe-xMn and Ti-xZr-7Fe-ySn alloys show C14 type Laves and β phases. It is quite interesting to investigate the deformation and strength characteristics of hexagonal close-packed C14 and face-centered cubic C15 type Laves phases in the soft β matrix. Therefore, the deformation and strength characteristics of C14 phase in Ti-35Zr-5Fe-6Mn and C15 phase in Ti- 33Zr-7Fe-4Cr, considering the same volume fraction of Laves phase (~7.0%) have been evaluated and compared using a micro-indentation method. Remarkably, dislocation activity and plastic deformation features are evident in the C15 phase, whereas the C14 phase strongly blocks dislocation motion. The Ti-33Zr-xFe-yCr, Ti-35Zr-5Fe-xMn and Ti-xZr-7Fe-ySn alloys, designed for high-strength applications, demonstrate yield strength from 1048 to 1580 MPa, ultimate compressive strength from 1498 to 2140 MPa and plastic strain from 2.6 to 33.6%. Further, the appropriate variation in the volume fraction of Laves phase helps in achieving an improved trade-off between strength and plasticity. Moreover, fracture analyses have also been executed for the Ti-33Zr-xFe-yCr, Ti-35Zr- 5Fe-xMn and Ti-xZr-7Fe-ySn alloys. It has been found that the crack propagates along the corresponding Laves phase present in these alloys. The results of the investigated alloys suggest that…

Subjects/Keywords: Titanium alloys; Mechanical properties; Microstructure; Deformation; Fracture analysis; Engineering; Materials Science and Engineering; Mechanical Engineering

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APA (6^th Edition):

Rabadia, C. D. (2020). Microstructure and mechanical behavior of metastable beta type titanium alloys. (Thesis). Edith Cowan University. Retrieved from https://ro.ecu.edu.au/theses/2278

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rabadia, Chirag Dhirajlal. “Microstructure and mechanical behavior of metastable beta type titanium alloys.” 2020. Thesis, Edith Cowan University. Accessed January 23, 2021. https://ro.ecu.edu.au/theses/2278.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rabadia, Chirag Dhirajlal. “Microstructure and mechanical behavior of metastable beta type titanium alloys.” 2020. Web. 23 Jan 2021.

Vancouver:

Rabadia CD. Microstructure and mechanical behavior of metastable beta type titanium alloys. [Internet] [Thesis]. Edith Cowan University; 2020. [cited 2021 Jan 23]. Available from: https://ro.ecu.edu.au/theses/2278.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rabadia CD. Microstructure and mechanical behavior of metastable beta type titanium alloys. [Thesis]. Edith Cowan University; 2020. Available from: https://ro.ecu.edu.au/theses/2278

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Michigan State University

12. Wang, Leyun. Evolution of deformation twins and dislocations near grain boundaries in commercial purity titanium.

Degree: 2011, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:1587

►

Thesis Ph. D. Michigan State University. Materials Science Engineering 2011.

Deformation of bulk polycrystalline materials often results in the development of dislocation slip bands and… (more)

▼

Thesis Ph. D. Michigan State University. Materials Science Engineering 2011.

Deformation of bulk polycrystalline materials often results in the development of dislocation slip bands and deformation twins in individual grains. Evolution of deformation microstructures is closely tied to the plasticity and service conditions of the material. This study employed two modern characterization tools, Electron Backscattered Diffraction (EBSD) and Differential Aperture X-ray Microscopy (DAXM), to study deformation twins and dislocations developed in deformed polycrystalline Ti. Through extensive EBSD characterization, it was found that many {10-12}<-1011> T1 twins nucleated from grain boundaries through a slip transfer process: dislocations gliding on a prismatic slip system stimulated twin nucleation in a neighboring grain. This slip transfer twin nucleation mechanism requires a good geometric alignment between the active slip system in one grain and the stimulated twinning system in the neighboring grain, represented by a high slip transfer parameter m'. The value of m' dictates which twinning system will be activated and suggests at which grain boundaries slip-stimulated twin nucleation will occur. Another important scenario for twin nucleation features pairs of twins that are connected with each other at grain boundaries. Statistical analysis of existing examples of paired twins indicates that the two operating twinning systems often have a good geometric alignment (high m'), and at least one of them must have a high Schmid factor. Paired twins are more often observed at low angle grain boundaries than at high angle grain boundaries. This finding was interpreted using the m' rule. DAXM is a non-destructive technique for characterizing subsurface microstructure, which reveals grain size, grain boundary inclination, and dislocation content. A method that relates the direction of peak streak in Laue patterns with local geometrically necessary dislocations (GNDs) was established. This method was used to analyze residual GNDs near grain boundaries. Combining high-resolution EBSD and DAXM, a comprehensive study of {11-21}<-1-126> T2 twins was conducted. Most T2 twins nucleated at grain boundaries with one or more tensile twins formed from the same place in the neighboring grain. Significant orientation gradients were observed in some T2 twins. Small T1 twins, transition regions with intermediate orientations, surface ledges, and microcracks were often observed near T2 twin boundaries. <c+a> dislocations, whose Burgers vector belong to the T2 twinning plane, were also identified in the vicinity of some T2 twins. Overall, this work provides new knowledge of microscopic deformation mechanisms in Ti, especially with regard to twinning, which can be incorporated into crystal plasticity constitutive models. In addition, the research methodology developed in this work is beneficial for other metallurgical studies.

Description based on online resource; title from PDF t.p. (ProQuest, viewed Feb. 10, 2012).

Advisors/Committee Members: Bieler, Thomas, Crimp, Martin, Grummon, David, Morelli, Donald, Pourboghrat, Farhang.

Subjects/Keywords: Metal crystals; Metallurgy; Grain boundaries; Titanium; Metals – Fracture; Alloys – Microstructure; Materials Science

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APA (6^th Edition):

Wang, L. (2011). Evolution of deformation twins and dislocations near grain boundaries in commercial purity titanium. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:1587

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wang, Leyun. “Evolution of deformation twins and dislocations near grain boundaries in commercial purity titanium.” 2011. Thesis, Michigan State University. Accessed January 23, 2021. http://etd.lib.msu.edu/islandora/object/etd:1587.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wang, Leyun. “Evolution of deformation twins and dislocations near grain boundaries in commercial purity titanium.” 2011. Web. 23 Jan 2021.

Vancouver:

Wang L. Evolution of deformation twins and dislocations near grain boundaries in commercial purity titanium. [Internet] [Thesis]. Michigan State University; 2011. [cited 2021 Jan 23]. Available from: http://etd.lib.msu.edu/islandora/object/etd:1587.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang L. Evolution of deformation twins and dislocations near grain boundaries in commercial purity titanium. [Thesis]. Michigan State University; 2011. Available from: http://etd.lib.msu.edu/islandora/object/etd:1587

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of North Texas

13. Thomas, Jonova. Microstructural Phase Evolution In Laser Deposited Compositionally Graded Titanium Chromium Alloys.

Degree: 2016, University of North Texas

URL: https://digital.library.unt.edu/ark:/67531/metadc849610/

► A compositionally graded Ti-xCr (10≤x≤30 wt%) alloy has been fabricated using Laser Engineered Net Shaping (LENSTM) to study the microstructural phase evolution along a compositional… (more)

Subjects/Keywords: Laser Engineered Net Shaping; Titanium alloys; Microstructure evolution; Material characterization; SEM; XRD; EDS; TEM; EBSD; Microhardness; Titanium-Chromium Binary alloy; Heat Treatment; Phase transformation; Compositional Gradient; β stabilized Ti alloy.; Titanium alloys – Microstructure.; Lasers in engineering.; Chromium alloys – Microstructure.

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APA (6^th Edition):

Thomas, J. (2016). Microstructural Phase Evolution In Laser Deposited Compositionally Graded Titanium Chromium Alloys. (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc849610/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Thomas, Jonova. “Microstructural Phase Evolution In Laser Deposited Compositionally Graded Titanium Chromium Alloys.” 2016. Thesis, University of North Texas. Accessed January 23, 2021. https://digital.library.unt.edu/ark:/67531/metadc849610/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Thomas, Jonova. “Microstructural Phase Evolution In Laser Deposited Compositionally Graded Titanium Chromium Alloys.” 2016. Web. 23 Jan 2021.

Vancouver:

Thomas J. Microstructural Phase Evolution In Laser Deposited Compositionally Graded Titanium Chromium Alloys. [Internet] [Thesis]. University of North Texas; 2016. [cited 2021 Jan 23]. Available from: https://digital.library.unt.edu/ark:/67531/metadc849610/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Thomas J. Microstructural Phase Evolution In Laser Deposited Compositionally Graded Titanium Chromium Alloys. [Thesis]. University of North Texas; 2016. Available from: https://digital.library.unt.edu/ark:/67531/metadc849610/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

14. Stemshorn, Andrew. Structural stability and compressibility of group IV transition metals based bulk metallic glasses.

Degree: MS, 2010, University of Alabama – Birmingham

URL: http://contentdm.mhsl.uab.edu/u?/etd,743

►

High pressure x-ray diffraction was carried out for two group IV transition metal based BMG’s Zr57Cu15.4Ni12.6Al10Nb5 and Ti42Zr24Cu15.5Ni14.5Be4. In the first run samples are taken… (more)

Subjects/Keywords: Metallic glasses – Microstructure <; br>; Metallic glasses – Mechanical properties <; br>; Metallic glasses – Compression testing <; br>; Compressibility <; br>; Zirconium alloys – Microstructure <; br>; Zirconium alloys – Mechanical properties <; br>; Zirconium alloys – Compression testing <; br>; Titanium alloys – Microstructure <; br>; Titanium alloys – Mechanical properties <; br>; Titanium alloys – Compression testing

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APA (6^th Edition):

Stemshorn, A. (2010). Structural stability and compressibility of group IV transition metals based bulk metallic glasses. (Masters Thesis). University of Alabama – Birmingham. Retrieved from http://contentdm.mhsl.uab.edu/u?/etd,743

Chicago Manual of Style (16^th Edition):

Stemshorn, Andrew. “Structural stability and compressibility of group IV transition metals based bulk metallic glasses.” 2010. Masters Thesis, University of Alabama – Birmingham. Accessed January 23, 2021. http://contentdm.mhsl.uab.edu/u?/etd,743.

MLA Handbook (7^th Edition):

Stemshorn, Andrew. “Structural stability and compressibility of group IV transition metals based bulk metallic glasses.” 2010. Web. 23 Jan 2021.

Vancouver:

Stemshorn A. Structural stability and compressibility of group IV transition metals based bulk metallic glasses. [Internet] [Masters thesis]. University of Alabama – Birmingham; 2010. [cited 2021 Jan 23]. Available from: http://contentdm.mhsl.uab.edu/u?/etd,743.

Council of Science Editors:

Stemshorn A. Structural stability and compressibility of group IV transition metals based bulk metallic glasses. [Masters Thesis]. University of Alabama – Birmingham; 2010. Available from: http://contentdm.mhsl.uab.edu/u?/etd,743

Brno University of Technology

15. Prachař, Václav. Makro a mikrostruktura svarových spojů titanové slitiny TiAl6V4 zhotovených elektronovým paprskem: Macro and microstructure of weld joints made of titanium alloy TiAl6V4 by electron beam.

Degree: 2018, Brno University of Technology

URL: http://hdl.handle.net/11012/81376

► The aim of this bachelor thesis is to evaluate macro and microstructures of weld joints made of titanium alloy Ti6Al4V by electron beam welding with… (more)

Subjects/Keywords: titan; titanové slitiny; Ti6Al4V; svařování elektronovým svazkem; makrostruktura; mikrostruktura; titanium; titanium alloys; Ti6Al4V; electron beam welding; macrostructure; microstructure

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APA (6^th Edition):

Prachař, V. (2018). Makro a mikrostruktura svarových spojů titanové slitiny TiAl6V4 zhotovených elektronovým paprskem: Macro and microstructure of weld joints made of titanium alloy TiAl6V4 by electron beam. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/81376

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Prachař, Václav. “Makro a mikrostruktura svarových spojů titanové slitiny TiAl6V4 zhotovených elektronovým paprskem: Macro and microstructure of weld joints made of titanium alloy TiAl6V4 by electron beam.” 2018. Thesis, Brno University of Technology. Accessed January 23, 2021. http://hdl.handle.net/11012/81376.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Prachař, Václav. “Makro a mikrostruktura svarových spojů titanové slitiny TiAl6V4 zhotovených elektronovým paprskem: Macro and microstructure of weld joints made of titanium alloy TiAl6V4 by electron beam.” 2018. Web. 23 Jan 2021.

Vancouver:

Prachař V. Makro a mikrostruktura svarových spojů titanové slitiny TiAl6V4 zhotovených elektronovým paprskem: Macro and microstructure of weld joints made of titanium alloy TiAl6V4 by electron beam. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11012/81376.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Prachař V. Makro a mikrostruktura svarových spojů titanové slitiny TiAl6V4 zhotovených elektronovým paprskem: Macro and microstructure of weld joints made of titanium alloy TiAl6V4 by electron beam. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/81376

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado School of Mines

16. Hudish, Grant A. Influence of microstructure on the shape memory properties of two Ti-lean, Ni-Ti-Pt high temperature shape memory alloys.

Degree: PhD, Metallurgical and Materials Engineering, 2013, Colorado School of Mines

URL: http://hdl.handle.net/11124/78987

► Because of NiTi's superior properties (work output, strength, ductility, recoverable strain, etc.) it is the base system of choice for development of derivative high-temperature shape… (more)

▼ Because of NiTi's superior properties (work output, strength, ductility, recoverable strain, etc.) it is the base system of choice for development of derivative high-temperature shape memory alloys (HTSMAs). Ternary additions of Hf, Zr, Pt, Pd, and Au can be made, in quantities greater than [approximate] 10 at.%, to increase the transformation temperature of Ni-Ti based SMAs. Pt as an alloying addition is attractive because of (1) its efficiency in raising the martensitic transformation temperature, (2) the relatively stable properties during thermal cycling of Pt-containing Nitinol (NiTi), and (3) the high work outputs of Ni-Ti-Pt alloys relative to other HTSMAs. Platinum containing samples of NiTi were thermally processed to explore the utility of Ti-lean precipitates for matrix strengthening and stabilization of shape memory properties during thermomechanical cycling. Two alloys, Ti48.5Ni30.5Pt21 and Ti49.5Ni29.5Pt21 were heat treated for 1, 5, 24 and 100h at 500, 550, 600, 650, and 700 degrees C and examined using SEM, EDS, DTA, XRD and TEM techniques. Two relevant precipitate phases, the PL and Ti2(Ni,Pt)3 phases, were identified, characterized and the thermodynamic stability and relevant behavior during thermal processing determined. Samples were then subjected to thermomechanical testing that consisted of two parts, (1) two thermal cycles (75 degrees C to 500 degrees C to 75 degrees C) each at stresses of 0, 50, 100, 150, 200, 250, and 300MPa, and (2) 100 thermal cycles at 200MPa. With this combination of systematic microstructural characterization and isobaric thermal cycling, the link between microstructure and shape memory performance was made. The influence the PL and Ti2(Ni,Pt)3 phases have on properties such as martensitic transformation temperatures, transformation strain, and accumulated irrecoverable strain are explained and discussed. Specifically, it was found that the PL-phase suppresses transformation temperatures and strains through a matrix strengthening effect, but also stabilizes property evolution, while the Ti2(Ni,Pt)3 phase plays a dominant role in modifying matrix chemistry, and subsequent transformation temperatures. Advisors/Committee Members: Kaufman, Michael J. (advisor), Eberhart, Mark E. (committee member), Gorman, Brian P. (committee member), Noebe, R. D. (committee member), Speer, J. G. (committee member).

Subjects/Keywords: high temperature shape memory alloys; shape memory alloys; precipitates; Ni-Ti-Pt; Nitinol; Shape memory alloys; Nickel-titanium alloys; Platinum; Microstructure; Precipitation (Chemistry)

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APA (6^th Edition):

Hudish, G. A. (2013). Influence of microstructure on the shape memory properties of two Ti-lean, Ni-Ti-Pt high temperature shape memory alloys. (Doctoral Dissertation). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/78987

Chicago Manual of Style (16^th Edition):

Hudish, Grant A. “Influence of microstructure on the shape memory properties of two Ti-lean, Ni-Ti-Pt high temperature shape memory alloys.” 2013. Doctoral Dissertation, Colorado School of Mines. Accessed January 23, 2021. http://hdl.handle.net/11124/78987.

MLA Handbook (7^th Edition):

Hudish, Grant A. “Influence of microstructure on the shape memory properties of two Ti-lean, Ni-Ti-Pt high temperature shape memory alloys.” 2013. Web. 23 Jan 2021.

Vancouver:

Hudish GA. Influence of microstructure on the shape memory properties of two Ti-lean, Ni-Ti-Pt high temperature shape memory alloys. [Internet] [Doctoral dissertation]. Colorado School of Mines; 2013. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11124/78987.

Council of Science Editors:

Hudish GA. Influence of microstructure on the shape memory properties of two Ti-lean, Ni-Ti-Pt high temperature shape memory alloys. [Doctoral Dissertation]. Colorado School of Mines; 2013. Available from: http://hdl.handle.net/11124/78987

Michigan State University

17. Ng, Boon-Chai. Studies of crack propagation and microcrack initiation in a near-gamma TiAl alloy.

Degree: PhD, Department of Chemical Engineering and Materials Science, 2005, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:33405

Subjects/Keywords: Titanium alloys – Fatigue; Aluminum alloys – Fatigue; Alloys – Microstructure; Metals – Fracture; Grain boundaries

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ng, B. (2005). Studies of crack propagation and microcrack initiation in a near-gamma TiAl alloy. (Doctoral Dissertation). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:33405

Chicago Manual of Style (16^th Edition):

Ng, Boon-Chai. “Studies of crack propagation and microcrack initiation in a near-gamma TiAl alloy.” 2005. Doctoral Dissertation, Michigan State University. Accessed January 23, 2021. http://etd.lib.msu.edu/islandora/object/etd:33405.

MLA Handbook (7^th Edition):

Ng, Boon-Chai. “Studies of crack propagation and microcrack initiation in a near-gamma TiAl alloy.” 2005. Web. 23 Jan 2021.

Vancouver:

Ng B. Studies of crack propagation and microcrack initiation in a near-gamma TiAl alloy. [Internet] [Doctoral dissertation]. Michigan State University; 2005. [cited 2021 Jan 23]. Available from: http://etd.lib.msu.edu/islandora/object/etd:33405.

Council of Science Editors:

Ng B. Studies of crack propagation and microcrack initiation in a near-gamma TiAl alloy. [Doctoral Dissertation]. Michigan State University; 2005. Available from: http://etd.lib.msu.edu/islandora/object/etd:33405

18. Gozdecki, Nicolas. Nouveaux alliages de titane à gradient de propriétés pour l'implantologie dentaire : approches expérimentale et numérique : New titanium-based alloys with functionnally graded properties for dental implantology : experimental and numerical approaches.

Degree: Docteur es, Sciences des matériaux, 2014, Université Pierre et Marie Curie – Paris VI

URL: http://www.theses.fr/2014PA066710

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Dans le domaine des biomatériaux, les alliages de titane sont parmi les matériaux les plus attractifs pour les implants ostéointégrés grâce à leur forte résistance… (more)

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Dans le domaine des biomatériaux, les alliages de titane sont parmi les matériaux les plus attractifs pour les implants ostéointégrés grâce à leur forte résistance à la biocorrosion, une meilleure biocompatibilité et de bonnes propriétés mécaniques spécifiques. Parmi ces propriétés, le faible module élastique des alliages de titane a fortement attiré l'attention par rapport à la transmission des contraintes fonctionnelles de l'implant à l'os environnant. L'objectif de ce travail de thèse consiste à obtenir des alliages de titane aux propriétés mécaniques modulables, possibles grâce au contrôle des traitements thermomécaniques. Ceci permet d'obtenir dans un premier temps un gradient d'élasticité au sein des alliages, ainsi qu'un gradient de tailles de grains dans un second temps. L'obtention de ces gradients est rendue possible grâce à la transformation martensitique réversible β ↔ α’’ ainsi qu'à la dissolution de phase ? par traitements thermiques flash. Il est également possible de contrôler les échelles microstructurales pour obtenir des matériaux nanostructurés, homogènes et stables thermiquement, permettant de mettre en évidence un comportement superplastique à basse température. Ces derniers résultats sont susceptibles de présenter une très bonne alternative aux procédés de SPD utilisés couramment. Une caractérisation complète de ces nouveaux matériaux est réalisée en combinant analyses MEB, MET et DRX. Les valeurs de modules élastiques sont obtenues par essais de traction et localement, par mesures de microindentation instrumentée.

In the field of biomaterials, titanium alloys are among the most attractive materials for osseointegrated implants due to their high biocorrosion resistance, increased general biocompatibility and specific mechanical properties. Among these properties, low elastic modulus of titanium alloys has attracted much attention regarding the transmission of functional loads from the implant to the surrounding bone. The aim of this work consists in developing functionally graded materials, with careful attention to the thermomechanical treatments. In one hand, this allows us to obtain a gradient of elasticity in bulk materials and in the other hand, a gradient of grain sizes. This is possible thanks to the reversible martensitic transformation β ↔ α’’ and also to the α phase dissolution during flash treatments. The microstructural scale is also controlled in order to develop homogeneous materials at the nanoscale, thermally stables, and exhibiting superplasticity at low temperatures. These results are thought to be good strategy to avoid the use of SPD processes. A complete characterization of these new materials is performed with the combination of SEM, TEM and XRD analyses to appreciate the modifications of the microstructures and grain sizes. Values of elastic modulus are obtained by tensile tests, and locally determined with the use of instrumented microindentation measurements.

Advisors/Committee Members: Prima, Frédéric (thesis director).

Subjects/Keywords: Alliages de titane; Superélasticité; Module élastique; Matériaux à gradient; Microstructure; Titanium alloys; Superelasticity; Elastic modulus; 546.3

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gozdecki, N. (2014). Nouveaux alliages de titane à gradient de propriétés pour l'implantologie dentaire : approches expérimentale et numérique : New titanium-based alloys with functionnally graded properties for dental implantology : experimental and numerical approaches. (Doctoral Dissertation). Université Pierre et Marie Curie – Paris VI. Retrieved from http://www.theses.fr/2014PA066710

Chicago Manual of Style (16^th Edition):

Gozdecki, Nicolas. “Nouveaux alliages de titane à gradient de propriétés pour l'implantologie dentaire : approches expérimentale et numérique : New titanium-based alloys with functionnally graded properties for dental implantology : experimental and numerical approaches.” 2014. Doctoral Dissertation, Université Pierre et Marie Curie – Paris VI. Accessed January 23, 2021. http://www.theses.fr/2014PA066710.

MLA Handbook (7^th Edition):

Gozdecki, Nicolas. “Nouveaux alliages de titane à gradient de propriétés pour l'implantologie dentaire : approches expérimentale et numérique : New titanium-based alloys with functionnally graded properties for dental implantology : experimental and numerical approaches.” 2014. Web. 23 Jan 2021.

Vancouver:

Gozdecki N. Nouveaux alliages de titane à gradient de propriétés pour l'implantologie dentaire : approches expérimentale et numérique : New titanium-based alloys with functionnally graded properties for dental implantology : experimental and numerical approaches. [Internet] [Doctoral dissertation]. Université Pierre et Marie Curie – Paris VI; 2014. [cited 2021 Jan 23]. Available from: http://www.theses.fr/2014PA066710.

Council of Science Editors:

Gozdecki N. Nouveaux alliages de titane à gradient de propriétés pour l'implantologie dentaire : approches expérimentale et numérique : New titanium-based alloys with functionnally graded properties for dental implantology : experimental and numerical approaches. [Doctoral Dissertation]. Université Pierre et Marie Curie – Paris VI; 2014. Available from: http://www.theses.fr/2014PA066710

19. Sarre, Benjamin. Influence du soudage laser Nd˸YAG sur les propriétés métallurgiques et mécaniques de l'alliage de titane TA6V : Influence of Laser Beam Welding on the Metallurgical and Mechanical Properties of the Titanium Alloy Ti-6Al-4V.

Degree: Docteur es, Matériaux, Mécanique, Optique et Nanotechnologie, 2018, Troyes

URL: http://www.theses.fr/2018TROY0019

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Le soudage est une opération consistant à assembler deux ou plusieurs pièces afin d’assurer la continuité d’une structure. Toutefois, l'opération de soudage n'est pas sans… (more)

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Le soudage est une opération consistant à assembler deux ou plusieurs pièces afin d’assurer la continuité d’une structure. Toutefois, l'opération de soudage n'est pas sans conséquence pour le matériau cible. En effet, l'état métallurgique et mécanique de ce dernier est profondément affecté. Cette étude vise à une meilleure compréhension de l'influence du procédé de soudage sur l'état métallurgique et mécanique de l'alliage de titane TA6V. L'état métallurgique de la liaison soudée a été caractérisé. Ces analyses ont mis en évidence un fort gradient de microstructure entre la zone fondue et le métal de base. Ces évolutions engendrent des contraintes résiduelles. Ces dernières ont été évaluées par le biais de la diffraction des rayons X. Une campagne d'essais a été réalisée à l'ESRF (ligne BM02). Les champs de contraintes ont été comparés aux prédictions d'un modèle de comportement mécanique. Les évolutions de microstructure sont également la source d'un gradient de propriétés mécaniques. Le comportement mécanique des liaisons soudées a été étudié. La zone fondue présente des caractéristiques mécaniques supérieures à celles du métal de base. La rupture intervient au sein de ce dernier, malgré la présence de défauts dans la zone fondue. Les résultats ont été comparés au modèle de Gurson-Tvergaard-Needleman. Le modèle permet de restituer de façon très satisfaisante le comportement mécanique des liaisons soudées

Welding operation consists of assembling two or more pieces to ensure the continuity of a structure. The resulting assembly may withstand mechanical loads. However, the welding operation modifies the state of materials. In other words, the metallurgical and mechanical behaviour of the latter is deeply affected. This work aims to better understand the influence of welding on the metallurgical and mechanical behavior of the Ti-6Al-4V titanium alloy. Comprehensive metallurgical analyses of the welded joint are carried out and reveal a sharp and strong microstructure gradient between the fusion zone and the base metal. Several residual stress fields are quantified by X-ray diffraction analyzes. Those residual stress fields are then compared with finite element simulations of the welding of a Ti-6Al-4V titanium alloy. The simulation are based on a weakly coupled model that accounts for temperature, stresses and phase transformations. The failure behaviour of the welded joint is studied. An overmatch was highlighted with mechanical tests. The fracture finally occurs in the base metal despite the presence of defects in the fusion zone. A Gurson-Tvergaard-Needleman approach is carried on. The mechanical parameters are quantified from mechanical tests on homogeneous samples of base metal and of a representative microstructure of the welded joint, which has been obtained from heat treatments. The model are in good agreement with mechanical tests

Advisors/Committee Members: Panicaud, Benoît (thesis director).

Subjects/Keywords: TA6V; Titanium alloys; Microstructure; Residual stresse; Numerical simulation; Elastroplasticity; Continuum damage mechanics; Synchrotron radiation; Welded joints; Laser welding; 671.52

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sarre, B. (2018). Influence du soudage laser Nd˸YAG sur les propriétés métallurgiques et mécaniques de l'alliage de titane TA6V : Influence of Laser Beam Welding on the Metallurgical and Mechanical Properties of the Titanium Alloy Ti-6Al-4V. (Doctoral Dissertation). Troyes. Retrieved from http://www.theses.fr/2018TROY0019

Chicago Manual of Style (16^th Edition):

Sarre, Benjamin. “Influence du soudage laser Nd˸YAG sur les propriétés métallurgiques et mécaniques de l'alliage de titane TA6V : Influence of Laser Beam Welding on the Metallurgical and Mechanical Properties of the Titanium Alloy Ti-6Al-4V.” 2018. Doctoral Dissertation, Troyes. Accessed January 23, 2021. http://www.theses.fr/2018TROY0019.

MLA Handbook (7^th Edition):

Sarre, Benjamin. “Influence du soudage laser Nd˸YAG sur les propriétés métallurgiques et mécaniques de l'alliage de titane TA6V : Influence of Laser Beam Welding on the Metallurgical and Mechanical Properties of the Titanium Alloy Ti-6Al-4V.” 2018. Web. 23 Jan 2021.

Vancouver:

Sarre B. Influence du soudage laser Nd˸YAG sur les propriétés métallurgiques et mécaniques de l'alliage de titane TA6V : Influence of Laser Beam Welding on the Metallurgical and Mechanical Properties of the Titanium Alloy Ti-6Al-4V. [Internet] [Doctoral dissertation]. Troyes; 2018. [cited 2021 Jan 23]. Available from: http://www.theses.fr/2018TROY0019.

Council of Science Editors:

Sarre B. Influence du soudage laser Nd˸YAG sur les propriétés métallurgiques et mécaniques de l'alliage de titane TA6V : Influence of Laser Beam Welding on the Metallurgical and Mechanical Properties of the Titanium Alloy Ti-6Al-4V. [Doctoral Dissertation]. Troyes; 2018. Available from: http://www.theses.fr/2018TROY0019

Michigan State University

20. Khademi, Vahid. An experimental-computational study on the plastic deformation behavior of body-centered cubic titanium alloys.

Degree: 2018, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:19672

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Thesis Ph. D. Michigan State University. Dual major, Mechanical Engineering ; Materials Science and Engineering 2018

A combined experimental-computational investigation was performed in the first… (more)

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Thesis Ph. D. Michigan State University. Dual major, Mechanical Engineering ; Materials Science and Engineering 2018

A combined experimental-computational investigation was performed in the first part of this work to quantify the relationship between plastic strain and crystallographic misorientation. Several material characterization techniques including tensile testing, Scanning Electron Microscopy (SEM), Digital Image Correlation (DIC), and Electron Backscatter Diffraction (EBSD) were combined to study the correlation between plastic strain and crystallographic misorientation at the microscale for two body-centered cubic (bcc) titanium (Ti) alloys, namely Ti-13Cr-1Fe-3Al (wt.%) and TIMETAL-21S [Ti 15Mo-3Nb-3Al-0.2Si (wt.%)]. The results revealed that larger grains experienced more misorientation dispersion compared to smaller grains. An empirical equation was proposed to estimate the crystallographic misorientation at the grain scale as a function of plastic strain and grain size. Furthermore, the effects of crystallographic orientation and loading history on the misorientation were investigated. It was observed that {100} oriented grains (with respect to the tensile axis) exhibited more of a tendency for orientation change than {110} and {111} oriented grains. Interrupted loading resulted in higher crystallographic misorientation than monotonic (uninterrupted) loading. A qualitative comparison between the DIC-SEM strain field map and the misorientation maps revealed that there is a better correlation between the hot spots in the KAM map and the DIC-SEM strain field map compares with the correlation between the hot spots in the MD maps and the DIC-SEM stain field map. Some of the metrics, developed in the misorientation analysis, were implemented by EDAX-TSL, Inc. (Mahwah, NJ) in their latest orientation imaging microscopy (OIM) commercial software. Slip trace analysis was performed to characterize the distribution of the plastic deformation modes at RT, 200 ̊C, and 300 ̊C on three bcc Ti alloys: Ti-13Cr-1Fe-3Al (wt.%), TIMETAL-21S, and Ti-29Nb-13Ta-4.6Zr-xO (wt.%), where x is 0.1, 0.3, and 0.7 (wt.%). The results revealed that dislocation slip was the dominant plastic deformation mechanism for Ti-13Cr-1Fe-3Al (wt.%), TIMETAL-21S, Ti-29Nb-13Ta-4.6Zr-0.3O (wt.%), and Ti-29Nb-13Ta-4.6Zr-0.7O (wt.%). The {123}<111> slip systems exhibited the highest contribution, while the {110}<111> showed the least contribution of the observed traces. However, the normalized slip activity (according to the possible slip planes of each system) suggested that the activity of all the systems were relatively equal for the TCFA, while the activity of the {110}<111> was slightly greater than other two slip systems for the TIMETAL-21S. Three deformation mechanisms, i.e., stress-induced martensitic (SIM) transformation (β phase to α” phase), the {332}<113> mechanical twinning, and the slip activity activated and cooperated for the Ti-29Nb-13Ta-4.6Zr-0.1O (wt.%). In the second part of this work, the room temperature (RT) and elevated…

Advisors/Committee Members: Boehlert, Carl J, Bieler, Thomas R, Pence, Thomas J, Eisenlohr, Philip.

Subjects/Keywords: Deformations (Mechanics) – Mathematical models; Titanium alloys – Surfaces; Body-centered cubic metals; Microstructure – Mathematical models; Mechanical engineering; Materials Science

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Khademi, V. (2018). An experimental-computational study on the plastic deformation behavior of body-centered cubic titanium alloys. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:19672

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Khademi, Vahid. “An experimental-computational study on the plastic deformation behavior of body-centered cubic titanium alloys.” 2018. Thesis, Michigan State University. Accessed January 23, 2021. http://etd.lib.msu.edu/islandora/object/etd:19672.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Khademi, Vahid. “An experimental-computational study on the plastic deformation behavior of body-centered cubic titanium alloys.” 2018. Web. 23 Jan 2021.

Vancouver:

Khademi V. An experimental-computational study on the plastic deformation behavior of body-centered cubic titanium alloys. [Internet] [Thesis]. Michigan State University; 2018. [cited 2021 Jan 23]. Available from: http://etd.lib.msu.edu/islandora/object/etd:19672.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Khademi V. An experimental-computational study on the plastic deformation behavior of body-centered cubic titanium alloys. [Thesis]. Michigan State University; 2018. Available from: http://etd.lib.msu.edu/islandora/object/etd:19672

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

21. Ballat-Durand, Dorick. Microstructural characterization and optimization of linear friction welded titanium alloys joints through the influence of the process parameters and post-weld heat treatments : Caractérisation microstructurale de joints d’alliages de titane obtenus par soudage friction linéaire et leur optimisation via l’influence des configurations procédé et le développement de traitements thermiques post-soudage.

Degree: Docteur es, Mécanique et Matériaux : Unité de recherche en Mécanique - Laboratoire Roberval (FRE UTC - CNRS 2012), 2019, Compiègne

URL: http://www.theses.fr/2019COMP2499

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Cette étude s’inscrit dans une démarche de réduction des coûts dus à l’utilisation croissante d’alliages de titane pour des applications structurelles, via des procédés d’assemblage… (more)

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Cette étude s’inscrit dans une démarche de réduction des coûts dus à l’utilisation croissante d’alliages de titane pour des applications structurelles, via des procédés d’assemblage à l’état solide, comme le soudage par friction linéaire (LFW). Cependant, les chargements thermomécaniques transmis au matériau au cours du LFW engendrent d’importantes transformations microstructurales pouvant affecter sévèrement la durabilité mécanique de l’assemblage. Ces transformations sont dépendantes à la fois de l’histoire thermomécanique du matériau et de ses éléments d’alliage. Ainsi, la compréhension des mécanismes régissant ces transformations en lien avec l’impact des configurations procédé et/ou de traitements thermiques sur ces dernières apparaît comme nécessaire pour des applications industrielles. Les travaux présentés dans ce document se focalisent sur la caractérisation/optimisation microstructurale de deux joints obtenus à partir de deux alliages sensiblement différents : le β-métastable Ti-5Al-2Sn-2Zr-4Mo-4Cr (Ti17) et le quasi-α Ti-6Al-2Sn-4Zr-2Mo (Ti6242). Une analyse détaillée des mécanismes impactant les transformations microstructurales et la résorption des défauts sera exposée en s’appuyant sur des études multi-techniques et multi-échelle. Ces campagnes expérimentales ont conduit à l’élaboration d’un traitement thermique permettant d’obtenir des comportements mécaniques quasi-homogènes au sein des structures soudées. De plus, les effets des principaux paramètres de LFW sur les microstructures ont été déterminés fournissant ainsi à la littérature des données essentielles pour la dissipation des défauts et le contrôle des textures de déformation.

The present study follows up two major development axes focusing on the increase in use of Ti-alloys for structur applications through the use of solid-state joining processes such as Linear Friction Welding (LFW). Yet, the therm mechanical loads involved during LFW result in remarkable microstructural changes deeply affecting the associate mechanical performances. These changes are concomitant with the thermo-mechanical processing history and the alloyin compositions of the welded Ti-alloys. Hence, a correct understanding of the microstructure transformation mechanism induced by LFW is required as well as identifying the influence of the process conditions and/or complementary he treatments on these changes. This dissertation is endeavored at characterizing and optimizing the microstructures of two butt-joints of significantl different Ti-alloys: the ß-metastable Ti-5Al-2Sn-2Zr-4Mo-4Cr (Ti17) and the near-α Ti-6Al-2Sn-4Zr-2Mo (Ti6242). The extensive microstructural investigations will focus on identifying the mechanisms responsible for transforming the microstructures and for the formation/resorption of welding defects. These investigations will combine temperatur measurements, micrographs, crystallographic/chemical analysis, hardness/tensile tests. The resulting comprehension the microstructural changes will enable designing a heat treatment capable of a…

Advisors/Committee Members: Bouvier, Salima (thesis director), Risbet-Voitot, Marion (thesis director).

Subjects/Keywords: Études multi-techniques; Linear friction welding (LFW); Titanium alloys; Microstructure; Heat treatment; Thermomechanical treatment; Welded joints

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ballat-Durand, D. (2019). Microstructural characterization and optimization of linear friction welded titanium alloys joints through the influence of the process parameters and post-weld heat treatments : Caractérisation microstructurale de joints d’alliages de titane obtenus par soudage friction linéaire et leur optimisation via l’influence des configurations procédé et le développement de traitements thermiques post-soudage. (Doctoral Dissertation). Compiègne. Retrieved from http://www.theses.fr/2019COMP2499

Chicago Manual of Style (16^th Edition):

Ballat-Durand, Dorick. “Microstructural characterization and optimization of linear friction welded titanium alloys joints through the influence of the process parameters and post-weld heat treatments : Caractérisation microstructurale de joints d’alliages de titane obtenus par soudage friction linéaire et leur optimisation via l’influence des configurations procédé et le développement de traitements thermiques post-soudage.” 2019. Doctoral Dissertation, Compiègne. Accessed January 23, 2021. http://www.theses.fr/2019COMP2499.

MLA Handbook (7^th Edition):

Ballat-Durand, Dorick. “Microstructural characterization and optimization of linear friction welded titanium alloys joints through the influence of the process parameters and post-weld heat treatments : Caractérisation microstructurale de joints d’alliages de titane obtenus par soudage friction linéaire et leur optimisation via l’influence des configurations procédé et le développement de traitements thermiques post-soudage.” 2019. Web. 23 Jan 2021.

Vancouver:

Ballat-Durand D. Microstructural characterization and optimization of linear friction welded titanium alloys joints through the influence of the process parameters and post-weld heat treatments : Caractérisation microstructurale de joints d’alliages de titane obtenus par soudage friction linéaire et leur optimisation via l’influence des configurations procédé et le développement de traitements thermiques post-soudage. [Internet] [Doctoral dissertation]. Compiègne; 2019. [cited 2021 Jan 23]. Available from: http://www.theses.fr/2019COMP2499.

Council of Science Editors:

Ballat-Durand D. Microstructural characterization and optimization of linear friction welded titanium alloys joints through the influence of the process parameters and post-weld heat treatments : Caractérisation microstructurale de joints d’alliages de titane obtenus par soudage friction linéaire et leur optimisation via l’influence des configurations procédé et le développement de traitements thermiques post-soudage. [Doctoral Dissertation]. Compiègne; 2019. Available from: http://www.theses.fr/2019COMP2499

Loughborough University

22. Simonelli, Marco. Microstructure evolution and mechanical properties of selective laser melted Ti-6Al-4V.

Degree: PhD, 2014, Loughborough University

URL: http://hdl.handle.net/2134/15070

► Selective laser melting (SLM) has been shown to be an attractive manufacturing route for the production of ??/?? titanium alloys, and in particular Ti-6Al-4V. A… (more)

▼ Selective laser melting (SLM) has been shown to be an attractive manufacturing route for the production of ??/?? titanium alloys, and in particular Ti-6Al-4V. A thorough understanding of the relationship between the process, microstructure and mechanical properties of the components produced by this technology is however crucial for the establishment of SLM as an alternative manufacturing route. The purpose of the present study is thus to determine the microstructure evolution, crystallographic texture and the mechanical properties of SLM Ti-6Al-4V. The effect of several processing parameters on the density and the microstructure of the SLM samples were initially investigated. It was found that different sets of process parameters can be used to fabricate near fully dense components. It was found that the samples built using the optimised process window consist exclusively of ????? martensitic phase precipitated from prior ?? columnar grains. It was observed that the ?? grain solidification is influenced by the laser scan strategy and that the ?? phase has a strong <001> texture along its grain growth direction. The ????? martensitic laths that originate from the parent ?? grains precipitate according to the Burgers orientation relationship. It was found that ????? laths clusters from the same ?? grain have a specific misorientation that minimise the local shape strain. Texture inheritance across successive deposited layers was also observed and discussed in relation to various variant selection mechanisms. The mechanical properties of as-built and stress relieved SLM Ti-6Al-4V built using the same optimised process parameters were then investigated. It was found that the build orientation affects the tensile properties, and in particular the ductility of the samples. Samples built perpendicularly to the building direction showed higher ductility than those built in the vertical orientation. It was also observed that a stress relief heat treatment was beneficial to the mechanical properties of SLM Ti-6Al-4V. The ductility of the stress relieved samples was indeed higher than those found in the as-built condition. It was found that the predominant fracture mode during tensile testing is inter-granular. In terms of high-cycle fatigue, it was found that SLM Ti-6Al-4V is comparable to HIPed cast Ti-6Al-4V but it has a significantly lower fatigue resistance than that of wrought and annealed alloys. It was observed that porosity and the elongated prior ?? grain boundaries decrease substantially the fatigue life of the components. Cracks propagate either by fatigue striation or ductile tearing mechanisms. Using alternative laser scan strategies it was possible to control the microstructure of the as-built samples. It was observed that the laser scan vector length influences several microstructural features, such as the width of the prior ?? grains and the thickness of the ????? laths. It was found that re-melting the same layer has instead little effect on the microstructure. A novel laser scan strategy characterised by…

Subjects/Keywords: 620.1; Ti-6Al-4V; Titanium alloys; Titanium; EBSD; TEM; Additive manufacturing; 3D printing; Selective laser melting; Microstructure; Texture; Tensile properties; Fatigue properties; Fractography; Martensitic trasformation; Laser; Process parameters

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Simonelli, M. (2014). Microstructure evolution and mechanical properties of selective laser melted Ti-6Al-4V. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/15070

Chicago Manual of Style (16^th Edition):

Simonelli, Marco. “Microstructure evolution and mechanical properties of selective laser melted Ti-6Al-4V.” 2014. Doctoral Dissertation, Loughborough University. Accessed January 23, 2021. http://hdl.handle.net/2134/15070.

MLA Handbook (7^th Edition):

Simonelli, Marco. “Microstructure evolution and mechanical properties of selective laser melted Ti-6Al-4V.” 2014. Web. 23 Jan 2021.

Vancouver:

Simonelli M. Microstructure evolution and mechanical properties of selective laser melted Ti-6Al-4V. [Internet] [Doctoral dissertation]. Loughborough University; 2014. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/2134/15070.

Council of Science Editors:

Simonelli M. Microstructure evolution and mechanical properties of selective laser melted Ti-6Al-4V. [Doctoral Dissertation]. Loughborough University; 2014. Available from: http://hdl.handle.net/2134/15070

The Ohio State University

23. Barry, Erin Patricia. Three-Dimensional Reconstruction of Microstructures in α + β Titanium Alloys.

Degree: MS, Materials Science and Engineering, 2008, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1211214635

► Titanium and its alloys are comparatively recent newcomers to the metallurgical market. They are gaining widespread acceptance for use in the recreational, aerospace, biomedical,… (more)

▼ Titanium and its alloys are comparatively recent newcomers to the metallurgical market. They are gaining widespread acceptance for use in the recreational, aerospace, biomedical, petro-chemical, and commercial processing industries due to their combination of unique and advantageous properties, including high strength, low density, and superior corrosion resistance to most aggressive agents. The material properties of titanium and its alloys can be optimized and tailored by engineering the microstructure via control of chemistry, processing route, and heat treatment. The morphology of the two crystallographic allotropic phases can be manipulated to refine the structure and produce desirable mechanical property combinations. Microstructural constitution of the titanium alloys is classified according to the dominant phase within the alloy; alpha + beta (α + β) titanium alloys are the most widely used alloys. The temperature of the final heat treatment of the α/β components is governed by the service requirements. In order to evaluate the behavior of these alloys for future applications, it is imperative that the microstructural features and characteristics be quantified and examined on a spatial dimension. The Robo-Met.3D is a high precision robotic serial sectioning device that can fulfill this need. Initially, several months were spent resolving problems with the functioning of the Robo.Met.3D. Two-dimensional (2-D) stereology was done on Timetal 550 using automated batch processing with Adobe Photoshop and Fovea Pro. Images from different locations on the gage were obtained and compared. Final data demonstrated quantitative differences which were the result of the heat treatment. Discrepancies and inconsistencies in the data were identified as limiting factors in the reproducibility of the procedure in future work. Serial sectioning using focused ion beam (FIB) was performed using Timetal 550, and three-dimensional (3-D) reconstruction was done using IMOD. Robo-Met.3D procedures and algorithms were identified for serial sectioning collection for titanium alloys using Ti-6Al-4V. Recommendations for future work include developing more efficient procedures for coloring in the microstructural features in the Adobe Photoshop CS™. A new procedure is needed to mount and polish the sample to prevent sample curvature due to the polishing step. Also, the small size of the secondary alpha (α) presents a challenge when examining microstructural features; however, it is imperative that these features be examined in the future to determine their effect on mechanical properties. Advisors/Committee Members: Fraser, Hamish (Advisor).

Subjects/Keywords: Materials Science; titanium alloys; stereology; titanium microstructure; robo-met.3D

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APA (6^th Edition):

Barry, E. P. (2008). Three-Dimensional Reconstruction of Microstructures in α + β Titanium Alloys. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1211214635

Chicago Manual of Style (16^th Edition):

Barry, Erin Patricia. “Three-Dimensional Reconstruction of Microstructures in α + β Titanium Alloys.” 2008. Masters Thesis, The Ohio State University. Accessed January 23, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1211214635.

MLA Handbook (7^th Edition):

Barry, Erin Patricia. “Three-Dimensional Reconstruction of Microstructures in α + β Titanium Alloys.” 2008. Web. 23 Jan 2021.

Vancouver:

Barry EP. Three-Dimensional Reconstruction of Microstructures in α + β Titanium Alloys. [Internet] [Masters thesis]. The Ohio State University; 2008. [cited 2021 Jan 23]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1211214635.

Council of Science Editors:

Barry EP. Three-Dimensional Reconstruction of Microstructures in α + β Titanium Alloys. [Masters Thesis]. The Ohio State University; 2008. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1211214635

24. Tanrikulu, Ahmet Alptug. Microstructure and Mechanical Properties of Additive Manufacturing Titanium Alloys After Thermal Processing.

Degree: MSMatSE, Mechanical and Materials Engineering, 2017, Portland State University

URL: https://pdxscholar.library.pdx.edu/open_access_etds/4088

► Titanium alloys are widely used for aerospace and biomaterial applications since their high specific strength, and high corrosion resistivity. Besides these properties, titanium is… (more)

Subjects/Keywords: Titanium alloys – Microstructure; Titanium alloys – Mechanical properties; Manufacturing processes; Materials Science and Engineering

…titanium alloys ��…..39 Figure 3.13: β-stabilizer effect on microstructure with quenching… …60 Figure 3.25: Typical microstructure of α+β titanium alloys; (a) Fully lamellar… …microstructure for α+β titanium alloys’ (slowly cooled from the bimodal recrystallization… …microstructure of β titanium alloys �� ..69 Figure 3.34: Microstructure of… …C…...31 viii Figure 3.8: Schematically process route of CP:Ti and α titanium alloys…

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APA (6^th Edition):

Tanrikulu, A. A. (2017). Microstructure and Mechanical Properties of Additive Manufacturing Titanium Alloys After Thermal Processing. (Masters Thesis). Portland State University. Retrieved from https://pdxscholar.library.pdx.edu/open_access_etds/4088

Chicago Manual of Style (16^th Edition):

Tanrikulu, Ahmet Alptug. “Microstructure and Mechanical Properties of Additive Manufacturing Titanium Alloys After Thermal Processing.” 2017. Masters Thesis, Portland State University. Accessed January 23, 2021. https://pdxscholar.library.pdx.edu/open_access_etds/4088.

MLA Handbook (7^th Edition):

Tanrikulu, Ahmet Alptug. “Microstructure and Mechanical Properties of Additive Manufacturing Titanium Alloys After Thermal Processing.” 2017. Web. 23 Jan 2021.

Vancouver:

Tanrikulu AA. Microstructure and Mechanical Properties of Additive Manufacturing Titanium Alloys After Thermal Processing. [Internet] [Masters thesis]. Portland State University; 2017. [cited 2021 Jan 23]. Available from: https://pdxscholar.library.pdx.edu/open_access_etds/4088.

Council of Science Editors:

Tanrikulu AA. Microstructure and Mechanical Properties of Additive Manufacturing Titanium Alloys After Thermal Processing. [Masters Thesis]. Portland State University; 2017. Available from: https://pdxscholar.library.pdx.edu/open_access_etds/4088

Universidade Estadual de Campinas

25. Cremasco, Alessandra, 1983-. Deformação plástica a frio, transformações de fases e propriedades mecânicas de ligas Ti-Nb-Sn para uso biomédico: Cold deformation, phases transformations and mechanical strength of Ti-Nb-Sn alloys for biomedical uses.

Degree: 2012, Universidade Estadual de Campinas

URL: http://repositorio.unicamp.br/jspui/handle/REPOSIP/263167

► Abstract: Titanium alloys with high _ stabilizing elements content, solution heat treated at high temperatures and rapidly cooled to room temperature, exhibit limited mechanical strength… (more)

▼ Abstract: Titanium alloys with high _ stabilizing elements content, solution heat treated at high temperatures and rapidly cooled to room temperature, exhibit limited mechanical strength and good ductility as a result of orthorhombic martensite formation or maintenance of the _ metastable phase. However, mechanical strength may be significantly improved by applying aging heat treatment, which leads to precipitation of new phases, combined with hardening provided by cold plastic deformation. The aim of this work is the development of alloys in the Ti-Nb-Sn system with optimized mechanical properties to be applied as biomaterial. Initially, titanium alloys with different alloying elements were tested in terms of cytocompatibility. The results suggest that Ti-Nb-Sn alloys are biocompatible. Following, Ti-Nb-Sn samples were prepared in arc furnace, heat treated aiming chemical and microstructural homogeneity, solution heat treated at high temperature, rapidly cooled to room temperature and cold plastically deformed. These samples were heat treated to promote recovery, recrystallization and aging of the microstructure. The results indicate that application of plastic deformation and annealing produces very refined microstructure. Application of aging heat treatments at 350 ° C resulted in decomposition of orthorhombic martensite phase and formation of _, w and a phases. It was found that mechanical properties of aged samples reflect the combination of such phases and their volume fractions. Microstructural refinement and a phase precipitation resulted in significant increase in hardness, elastic modulus and mechanical strength, as well as a decrease in ductility. Finally, application of optimal processing conditions resulted in samples with high mechanical strength and reasonable ductility. The Ti-35Nb-4Sn alloy showed lower elastic modulus and superior tensile strength. These results consist in ideal conditions for biomedical applications Advisors/Committee Members: UNIVERSIDADE ESTADUAL DE CAMPINAS (CRUESP), Caram Junior, Rubens, 1958- (advisor), Junior, Rubens Caram (advisor), Universidade Estadual de Campinas. Faculdade de Engenharia Mecânica (institution), Programa de Pós-Graduação em Engenharia Mecânica (nameofprogram), Fogagnolo, João Batista (committee member), Santos, Rezende Gomes dos (committee member), Afonso, Conrado Ramos Moreira (committee member), Oliveira, Marcelo Falcão de (committee member).

Subjects/Keywords: Ligas de titânio; Microestrutura; Metais - Propriedades mecânicas; Metais - Tratamento térmico; Materiais biomédicos; Titanium alloys; Microstructure; Mechanical properties of metals; Heat treatment of metals; Biomedical materials

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APA (6^th Edition):

Cremasco, Alessandra, 1. (2012). Deformação plástica a frio, transformações de fases e propriedades mecânicas de ligas Ti-Nb-Sn para uso biomédico: Cold deformation, phases transformations and mechanical strength of Ti-Nb-Sn alloys for biomedical uses. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/263167

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cremasco, Alessandra, 1983-. “Deformação plástica a frio, transformações de fases e propriedades mecânicas de ligas Ti-Nb-Sn para uso biomédico: Cold deformation, phases transformations and mechanical strength of Ti-Nb-Sn alloys for biomedical uses.” 2012. Thesis, Universidade Estadual de Campinas. Accessed January 23, 2021. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263167.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cremasco, Alessandra, 1983-. “Deformação plástica a frio, transformações de fases e propriedades mecânicas de ligas Ti-Nb-Sn para uso biomédico: Cold deformation, phases transformations and mechanical strength of Ti-Nb-Sn alloys for biomedical uses.” 2012. Web. 23 Jan 2021.

Vancouver:

Cremasco, Alessandra 1. Deformação plástica a frio, transformações de fases e propriedades mecânicas de ligas Ti-Nb-Sn para uso biomédico: Cold deformation, phases transformations and mechanical strength of Ti-Nb-Sn alloys for biomedical uses. [Internet] [Thesis]. Universidade Estadual de Campinas; 2012. [cited 2021 Jan 23]. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/263167.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cremasco, Alessandra 1. Deformação plástica a frio, transformações de fases e propriedades mecânicas de ligas Ti-Nb-Sn para uso biomédico: Cold deformation, phases transformations and mechanical strength of Ti-Nb-Sn alloys for biomedical uses. [Thesis]. Universidade Estadual de Campinas; 2012. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/263167

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Université de Lorraine

26. Wen, Jing. Effet de l'hydrogène sur la microstructure et la déformation en laminage à froid du titane de pureté commerciale et d'un alliage de titane β métastable : Effect of Hydrogen on the Microstructure and Cold Rolling Behavior of Commercially Pure Titanium and β-metastable Titanium Alloy.

Degree: Docteur es, Sciences des matériaux, 2017, Université de Lorraine

URL: http://www.theses.fr/2017LORR0167

► En raison d’une combinaison de propriétés physiques, chimiques et mécaniques remarquables, les alliages de titane et de titane sont devenus des candidats prometteurs dans le… (more)

▼ En raison d’une combinaison de propriétés physiques, chimiques et mécaniques remarquables, les alliages de titane et de titane sont devenus des candidats prometteurs dans le domaine de l'industrie chimique, de l’aéronautique, de l'aérospatiale et des matériaux biomédicaux. Durant les procédures de fabrication ainsi qu’en service, les composants sont exposés à des environnements tels que la surface de ces composant seront exposées à l’hydrogène. Par conséquent, la compréhension de l’interaction de ces matériaux avec l'hydrogène lors de divers procédés de d’élaboration et de mise en forme est importante afin que leurs propriétés et leurs performances puissent être contrôlées et prédites de manière fiable. Dans le but d'améliorer les propriétés et les performances du titane et de réduire le coût de fabrication des produits en titane, le présent travail se concentre principalement sur les effets de l'hydrogène sur le laminage à froid et le phénomène de recristallisation de deux titanes caractérisés par une structure cristalline différente, c'est-à-dire une structure hexagonale et cubique cubique pour respectivement le titane de pureté commerciale Ti50A et l'alliage de titane β-métastable β-21S. Étant donné que la microstructure du titane et de ses alliages est le facteur contrôlant leurs propriétés et leurs performances, l'évolution microstructurale en présence d'hydrogène introduit par deux méthodes distinctes a été analysée par une combinaison de techniques expérimentales incluant DRX, SEM-EBSD et TEM. L'introduction de l'hydrogène dans le Ti50A par une méthode électrolytique a conduit à la précipitation de deux types d'hydrures (δ-TiHx, ε-TiH2) dans la matrice de phase , et il a été constaté que la fraction volumique de ces hydrures augmentait avec la durée du temps de chargement électrolytique. En raison du mode de formation par précipitation à partir des joints de grains, cinq relations d'orientation (OR) entre la -phase et l'hydrure δ-TiHx ont été déterminées par analyses des projections stéréographiques, et parmi celles-ci trois nouvelles relations d'orientation ont pu être mise en évidence. En outre, la corrélation entre la texture de laminage et la précipitation à l'hydrure a pu être établie. On a constaté que l'existence de la texture de de laminage facilitait la précipitation d'hydrure δ suivant l'orientation d’orientation de type OR2. Les analyses de rayons X révélaient un élargissement des pics de diffraction de la phase , ce qui indiquait une augmentation de la densité de dislocation, ces dislocations étant nécessaires pour tenir compte de l'inadéquation du réseau entre les hydrures et la matrice. Sur la surface d’échantillons déformés en compression, l'observation des traces de glissement et de macle de tension de type TT1 {10 2} < 011> dans les -grains contenant des hydrures a suggéré que les hydrures avaient une certaine capacité à supporter une déformation de cisaillement, en fonction des relations d'orientation entre la matrice et les hydrures mais aussi de leur épaisseur. Bien qu'aucune… Advisors/Committee Members: Fleury, Éric (thesis director), Bonasso, Nathalie (thesis director).

Subjects/Keywords: Alliages de titane; Hydrogène charge; Évolution de la microstructure; Propriétés mécaniques; Recristallisation; Titanium alloys; Hydrogen charging; Microstructural evolution; Mechanical properties; Recrystallization; 671.32

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wen, J. (2017). Effet de l'hydrogène sur la microstructure et la déformation en laminage à froid du titane de pureté commerciale et d'un alliage de titane β métastable : Effect of Hydrogen on the Microstructure and Cold Rolling Behavior of Commercially Pure Titanium and β-metastable Titanium Alloy. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2017LORR0167

Chicago Manual of Style (16^th Edition):

Wen, Jing. “Effet de l'hydrogène sur la microstructure et la déformation en laminage à froid du titane de pureté commerciale et d'un alliage de titane β métastable : Effect of Hydrogen on the Microstructure and Cold Rolling Behavior of Commercially Pure Titanium and β-metastable Titanium Alloy.” 2017. Doctoral Dissertation, Université de Lorraine. Accessed January 23, 2021. http://www.theses.fr/2017LORR0167.

MLA Handbook (7^th Edition):

Wen, Jing. “Effet de l'hydrogène sur la microstructure et la déformation en laminage à froid du titane de pureté commerciale et d'un alliage de titane β métastable : Effect of Hydrogen on the Microstructure and Cold Rolling Behavior of Commercially Pure Titanium and β-metastable Titanium Alloy.” 2017. Web. 23 Jan 2021.

Vancouver:

Wen J. Effet de l'hydrogène sur la microstructure et la déformation en laminage à froid du titane de pureté commerciale et d'un alliage de titane β métastable : Effect of Hydrogen on the Microstructure and Cold Rolling Behavior of Commercially Pure Titanium and β-metastable Titanium Alloy. [Internet] [Doctoral dissertation]. Université de Lorraine; 2017. [cited 2021 Jan 23]. Available from: http://www.theses.fr/2017LORR0167.

Council of Science Editors:

Wen J. Effet de l'hydrogène sur la microstructure et la déformation en laminage à froid du titane de pureté commerciale et d'un alliage de titane β métastable : Effect of Hydrogen on the Microstructure and Cold Rolling Behavior of Commercially Pure Titanium and β-metastable Titanium Alloy. [Doctoral Dissertation]. Université de Lorraine; 2017. Available from: http://www.theses.fr/2017LORR0167

27. Gonser, Matthew J. Microstructure Evolution and Material Flow Behavior in Friction-Stir Welded Dissimilar Titanium Alloys.

Degree: PhD, Welding Engineering, 2010, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1268138325

► In certain aerospace structures the joining of dissimilar titanium alloys may be necessary. Fusion welding of these alloys together results in the formation of… (more)

▼ In certain aerospace structures the joining of dissimilar titanium alloys may be necessary. Fusion welding of these alloys together results in the formation of large beta grains and transformed-beta microstructures that can be deleterious to mechanical performance. Friction-stir welding (FSW) was proposed due to the reported microstructural advantages afforded by the process. The purpose of this study was to friction-stir weld dissimilar titanium alloys (Ti-6Al-4V and Timetal 21S, both 1.27 mm in thickness) together and to investigate how macroscopic flow in the stir zone and the resulting weld microstructure affect mechanical properties. Welds were produced using a refractory tool with travel speeds from 50 to 100 mm/min and tool rotation speeds of 2000 to 3500 revolutions per minute (RPM). Basketweave and colony alpha and beta phase in the prior-beta grains formed on the Ti-6Al-4V side of the stir zone and near-HAZ. The Timetal 21S region of the stir zone consisted of refined (approximately 18 μm in diameter) metastable-beta grains compared to 30 μm diameter grains in the Timetal 21S base material. Metallurgical mixing between the two alloys resulted in a unique alpha-beta microstructure in the stir zone with high hardness (450 Vicker’s Hardness Number (VHN)). The hardness increase was attributed to a fine distribution of alpha and beta phase. The highest tensile strength (1.1 GPa, 158 ksi) and elongation (8%) for as-welded specimens occurred when lower rotation speeds (3000 RPM) and highest travel speeds (100 mm/min) were used. Placement of the Timetal 21S on the retreating side resulted in the failure of tensile samples in the Timetal 21S base material. If the Ti-6Al-4V was placed on the retreating side, the failure occurred in the SZ/TMAZ region on the Timetal 21S side of the weld. Placement of the Ti-6Al-4V alloy on the retreating side increased the amount of metallurgical mixing between the two alloys by 40% compared to when the Timetal 21S was placed on the retreating side. Electron back-scatter diffraction (EBSD) clearly showed the presence of a TMAZ adjacent to the stir zone on the Timetal 21S side of the weld. This was confirmed by the large number of low angle subgrains within the deformed metastable-beta matrix. A series of aging and solution treatment plus aging heat treatments was given to select as-welded samples. The peak hardness for all regions was obtained for the 500°C-8 hour heat treatment, while the 600°C-8 hour heat treatment effectively equalized the hardness values across the entire weld. The heat treatment response of the metallurgically-mixed alpha-beta microstructure was dependent on alpha stabilizer content. In terms of material flow, the material directly ahead of the tool shoulder and pin is swept into the stir zone as high-temperature beta phase, so the transport of material in the stir zone during friction-stir welding was, therefore, found to be dependent on the flow stress-dependent viscosity of the alloys. In addition, subgrain formation leads to harder… Advisors/Committee Members: Babu, Sudarsanam Suresh (Advisor).

Subjects/Keywords: Engineering; Friction-stir welding; titanium alloys; material flow; microstructure evolution

…Microstructure and Properties of Fusion and Solid-State Welded Titanium Alloys… …8.2.3 Mechanical Behavior and Microstructure of Titanium Alloys 144 149 149 152 156 9… …136 8.1 Microstructure of α+β titanium alloys for a given cooling rate [13]… …titanium alloys that can result in a fine beta grain microstructure. The FSW of alpha-beta and… …Microstructure and Properties of Fusion and SolidState Welded Titanium Alloys While titanium alloys…

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APA (6^th Edition):

Gonser, M. J. (2010). Microstructure Evolution and Material Flow Behavior in Friction-Stir Welded Dissimilar Titanium Alloys. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1268138325

Chicago Manual of Style (16^th Edition):

Gonser, Matthew J. “Microstructure Evolution and Material Flow Behavior in Friction-Stir Welded Dissimilar Titanium Alloys.” 2010. Doctoral Dissertation, The Ohio State University. Accessed January 23, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1268138325.

MLA Handbook (7^th Edition):

Gonser, Matthew J. “Microstructure Evolution and Material Flow Behavior in Friction-Stir Welded Dissimilar Titanium Alloys.” 2010. Web. 23 Jan 2021.

Vancouver:

Gonser MJ. Microstructure Evolution and Material Flow Behavior in Friction-Stir Welded Dissimilar Titanium Alloys. [Internet] [Doctoral dissertation]. The Ohio State University; 2010. [cited 2021 Jan 23]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1268138325.

Council of Science Editors:

Gonser MJ. Microstructure Evolution and Material Flow Behavior in Friction-Stir Welded Dissimilar Titanium Alloys. [Doctoral Dissertation]. The Ohio State University; 2010. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1268138325

28. Zheng, Yufeng. Nucleation Mechanisms of Refined Alpha Microstructure in Beta Titanium Alloys.

Degree: PhD, Materials Science and Engineering, 2013, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1366296464

► Due to a great combination of physical and mechanical properties, beta titanium alloys have become promising candidates in the field of chemical industry, aerospace and… (more)

Subjects/Keywords: Materials Science; titanium alloys; microstructure evolution; phase transformation; electron microscopy

…microstructure and properties relationship. 1 In recent years,  titanium alloys start to attract… …titanium alloys; while as-quenched state microstructure is good for qualitative indication of Mo… …Precipitation Mediated by Compositional Fluctuation in Titanium Alloys”, Acta Materialla (2012… …1 Chapter 2: Physical Metallurgy of Titanium and Titanium Alloys… …Titanium �� ….7 2.4 Phases in titanium alloys �� ..9 2.4.1…

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APA (6^th Edition):

Zheng, Y. (2013). Nucleation Mechanisms of Refined Alpha Microstructure in Beta Titanium Alloys. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1366296464

Chicago Manual of Style (16^th Edition):

Zheng, Yufeng. “Nucleation Mechanisms of Refined Alpha Microstructure in Beta Titanium Alloys.” 2013. Doctoral Dissertation, The Ohio State University. Accessed January 23, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366296464.

MLA Handbook (7^th Edition):

Zheng, Yufeng. “Nucleation Mechanisms of Refined Alpha Microstructure in Beta Titanium Alloys.” 2013. Web. 23 Jan 2021.

Vancouver:

Zheng Y. Nucleation Mechanisms of Refined Alpha Microstructure in Beta Titanium Alloys. [Internet] [Doctoral dissertation]. The Ohio State University; 2013. [cited 2021 Jan 23]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1366296464.

Council of Science Editors:

Zheng Y. Nucleation Mechanisms of Refined Alpha Microstructure in Beta Titanium Alloys. [Doctoral Dissertation]. The Ohio State University; 2013. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1366296464

The Ohio State University

29. Kar, Sujoy Kumar. Modeling of mechanical properties in alpha/beta-titanium alloys.

Degree: PhD, Materials Science and Engineering, 2005, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1122570452

► The accelerated insertion of titanium alloys in component application requires the development of predictive capabilities for various aspects of their behavior, for example, phase stability,… (more)

▼ The accelerated insertion of titanium alloys in component application requires the development of predictive capabilities for various aspects of their behavior, for example, phase stability, microstructural evolution and property-microstructure relationships over a wide range of length and time scales. In this presentation some novel aspects of property-microstructure relationships and microstructural evolution in alpha/beta Ti alloys will be discussed. Neural Network (NN) Models based on a Bayesian framework have been developed to predict the mechanical properties of alpha/beta Ti alloys. The development of such rules-based model requires the population of extensive databases, which in the present case are microstructurally-based. The steps involved in database development include producing controlled variations of the microstructure using novel approaches to heat-treatments, the use of standardized stereology protocols to characterize and quantify microstructural features rapidly, and mechanical testing of the heat-treated specimens. These databases have been used to train and test NN Models for prediction of mechanical properties. In addition, these models have been used to identify the influence of individual microstructural features on the mechanical properties, consequently guiding the efforts towards development of more robust mechanistically based models. In order to understand the property-microstructure relationships, a detailed understanding of microstructure evolution is imperative. The crystallography of the microstructure developing as a result of the solid-state beta to beta + alpha transformation has been studied in detail by employing Scanning Electron Microscopy (SEM), Orientation Imaging Microscopy (in a high resolution SEM), site-specific TEM sample preparation using focused ion beam, and TEM based techniques. The influence of variant selection on the evolution of microstructure will be specifically addressed. Advisors/Committee Members: Fraser, Hamish (Advisor).

Subjects/Keywords: Neural Network; Mcrostructure-Property Relationships; Microstructure Evolution; alpha/beta Titanium alloys

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APA (6^th Edition):

Kar, S. K. (2005). Modeling of mechanical properties in alpha/beta-titanium alloys. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1122570452

Chicago Manual of Style (16^th Edition):

Kar, Sujoy Kumar. “Modeling of mechanical properties in alpha/beta-titanium alloys.” 2005. Doctoral Dissertation, The Ohio State University. Accessed January 23, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1122570452.

MLA Handbook (7^th Edition):

Kar, Sujoy Kumar. “Modeling of mechanical properties in alpha/beta-titanium alloys.” 2005. Web. 23 Jan 2021.

Vancouver:

Kar SK. Modeling of mechanical properties in alpha/beta-titanium alloys. [Internet] [Doctoral dissertation]. The Ohio State University; 2005. [cited 2021 Jan 23]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1122570452.

Council of Science Editors:

Kar SK. Modeling of mechanical properties in alpha/beta-titanium alloys. [Doctoral Dissertation]. The Ohio State University; 2005. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1122570452

Universidade Estadual de Campinas

30. Aleixo, Giorgia Taiacol. Obtenção, caracterização microestrutural e mecanica de ligas Ti-Nb-Sn aplicadas em implantes ortopedicos: Obtaining and microstructualand mechanical characterization of Ti-Nb-Sn alloys applied as biomaterial.

Degree: 2009, Universidade Estadual de Campinas

URL: http://repositorio.unicamp.br/jspui/handle/REPOSIP/263184

► Abstract: This work deals with preparation, processing and microstructural and mechanical characterization of ß type Ti-Nb-Sn alloys aiming the manufacturing of orthopedic devices for implants.… (more)

▼ Abstract: This work deals with preparation, processing and microstructural and mechanical characterization of ß type Ti-Nb-Sn alloys aiming the manufacturing of orthopedic devices for implants. Ti samples containing Nb at levels of 25, 30 and 35 wt % and Sn at levels of 2, 4 and 8 wt % were prepared by arc melting, homogenized at 1000ºC/8 h and plastically deformed by swaging. These samples were submitted to continuous cooling experiments to evaluate conditions for obtaining metastable phase. Then, samples heated to 1000ºC were rapidly cooled and analyzed by using differential scanning calorimetry and X-ray diffraction at medium temperatures, which allowed the evaluation of martensite decomposition. Next, samples in the ß field were air-cooled, which resulted in microstructures with a phase precipitated into ß matrix. These samples were characterized concerning the microstructure by applying optical, scanning electron and transmission electron microscopies and X-ray diffraction, while the mechanical behavior was evaluated by Vickers hardness test, elastic modulus measurement using acoustic techniques, tensile and fatigue tests. The results obtained indicate that martensite decomposition results in ß, ? and finally a phases. It was also found that ? phase acts as substrate for a phase nucleation. The sample mechanical behavior directly depends on the phases present in the microstructure, as well as their volumetric fraction. It was also observed that elastic modulus, hardness and tensile strength of air cooled samples show higher values than those of rapidly quenched samples, while ductility decreases. Finally, it was observed that fatigue resistance of air cooled samples is higher for low Nb content alloys, however, it decreases with Sn addition Advisors/Committee Members: UNIVERSIDADE ESTADUAL DE CAMPINAS (CRUESP), Caram Junior, Rubens, 1958- (advisor), Junior, Rubens Caram (advisor), Afonso, Conrado Ramos Moreira (coadvisor), Universidade Estadual de Campinas. Faculdade de Engenharia Mecânica (institution), Programa de Pós-Graduação em Engenharia Mecânica (nameofprogram), Ferreira, Itamar (committee member), Freire, Celia Marina de Alvarenga (committee member), Fogagnolo, João Batista (committee member), Oliveira, Marcelo Falcão de (committee member).

Subjects/Keywords: Ligas de titânio; Microestrutura; Titanio - Metalurgia; Ligas de titanio - Resfriamento; Metais - Tempera; Titanium alloys; Microstructure; Titanium sponge; Titanium alloys cooling; Quenching og metals

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APA (6^th Edition):

Aleixo, G. T. (2009). Obtenção, caracterização microestrutural e mecanica de ligas Ti-Nb-Sn aplicadas em implantes ortopedicos: Obtaining and microstructualand mechanical characterization of Ti-Nb-Sn alloys applied as biomaterial. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/263184

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Aleixo, Giorgia Taiacol. “Obtenção, caracterização microestrutural e mecanica de ligas Ti-Nb-Sn aplicadas em implantes ortopedicos: Obtaining and microstructualand mechanical characterization of Ti-Nb-Sn alloys applied as biomaterial.” 2009. Thesis, Universidade Estadual de Campinas. Accessed January 23, 2021. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263184.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Aleixo, Giorgia Taiacol. “Obtenção, caracterização microestrutural e mecanica de ligas Ti-Nb-Sn aplicadas em implantes ortopedicos: Obtaining and microstructualand mechanical characterization of Ti-Nb-Sn alloys applied as biomaterial.” 2009. Web. 23 Jan 2021.

Vancouver:

Aleixo GT. Obtenção, caracterização microestrutural e mecanica de ligas Ti-Nb-Sn aplicadas em implantes ortopedicos: Obtaining and microstructualand mechanical characterization of Ti-Nb-Sn alloys applied as biomaterial. [Internet] [Thesis]. Universidade Estadual de Campinas; 2009. [cited 2021 Jan 23]. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/263184.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Aleixo GT. Obtenção, caracterização microestrutural e mecanica de ligas Ti-Nb-Sn aplicadas em implantes ortopedicos: Obtaining and microstructualand mechanical characterization of Ti-Nb-Sn alloys applied as biomaterial. [Thesis]. Universidade Estadual de Campinas; 2009. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/263184

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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