subject:(Ni Al Zr Alloys)

Indian Institute of Science

1. Gunjal, Vilas Vishnu. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys.

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

URL: http://etd.iisc.ac.in/handle/2005/2965

► The excellent high temperature microstructure stability, high strength, and oxidation resistance of intermetallics has for long driven the development of intermetallic based alloys. More recent… (more)

▼ The excellent high temperature microstructure stability, high strength, and oxidation resistance of intermetallics has for long driven the development of intermetallic based alloys. More recent studies demonstrated attractive properties of eutectic intermetallic in the Ni-Al-Zr systems. This thesis deals with study of binary Ni3Al+Ni7Zr2, NiAl+Ni7Zr2 and Ni3Al+NiAl+Ni7Zr2 ternary intermetallic eutectic alloys in this system and includes the identification of compositions that would yield each eutectic structure and their microstructural characterization, mechanical and oxidation behavior. The thesis is divided into six chapters. Chapter 1 reviews the study on high temperature materials development and presents the objectives of work in the current thesis. Various experimental techniques used for alloy preparation (vacuum arc melting and vacuum suction casting), microstructural characterization (optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray Diffraction (XRD), electron probe micro analyzer (EPMA), differential scanning calorimetry (DSC)), compression tests, microhardness tests and thermo gravimetric analysis (TGA) are described in Chapter 2. The specific background of work related to each chapter together with experimental results and discussion are given in next three chapters. Chapter 3 reports the method of identification of the composition for each of the eutectic alloys referred to above. The identification of alloy compositions of binary eutectics Ni3Al+Ni7Zr2 (Ni-13.5Al-11Zr), NiAl+Ni7Zr2 (Ni-19Al-12Zr) and Ni3Al+NiAl+Ni7Zr2 ternary eutectic (Ni-18.4Al-11.6Zr) is carried out with the help of available liquidus projection of Ni-Al-Zr system, and the iterative melting of numerous compositions that were refined to define the critical compositions for each eutectic. The microstructural features of these alloys have been characterized using optical and electron microscopy. Phase identification is confirmed by X ray diffraction, EPMA and TEM. The microstructure of Ni3Al+Ni7Zr2 and Ni3Al+NiAl+Ni7Zr2 ternary eutectic alloy shows similar eutectic morphologies. The eutectic colony consists of lamellar plates at center and intermixed lamellar-rod irregular morphologies towards the boundaries of the colonies. However, the NiAl+Ni7Zr2 eutectic alloy shows a fine, lamellar plate morphology throughout the microstructure. The orientation relationship between eutectic phases is determined using TEM technique for each alloy composition. Onsets of melting and liquidus temperatures have been identified by Differential Scanning Calorimetry. Modified liquidus projections of Ni-Al-Zr system near the Ni3Al+NiAl+Ni7Zr2 ternary eutectic region have been derived from present experimental work. Chapter 4 focuses on understanding the mechanical behaviour of these individual eutectics at room temperature and high temperature. An attempt has been made to correlate the microstructure and mechanical properties of eutectics by measuring room temperature hardness, compressive yield strength… Advisors/Committee Members: Banerjee, D (advisor).

Subjects/Keywords: Intermetallic Eutectic Alloy; Nickel Aluminium Zirconium Alloys; Binary Eutectics; Ternary Eutectics; Eutectic Alloys; Eutectics; Ni3Al; Ni-Al-Zr Alloys; Ni7Zr2; Ni-Al-Zr System; Materials Engineering

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APA (6^th Edition):

Gunjal, V. V. (2018). Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2965

Chicago Manual of Style (16^th Edition):

Gunjal, Vilas Vishnu. “Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/2965.

MLA Handbook (7^th Edition):

Gunjal, Vilas Vishnu. “Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys.” 2018. Web. 16 Jan 2021.

Vancouver:

Gunjal VV. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/2965.

Council of Science Editors:

Gunjal VV. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/2965

Indian Institute of Science

2. Tiwary, Chandra Sekhar. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys.

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

URL: http://etd.iisc.ac.in/handle/2005/2991

► The thesis introduces a novel alloy system based on submicron distributions of intermetallic phases realised through eutectic solidification in the ternary system Ni-Al-Zr. Various compositions… (more)

▼ The thesis introduces a novel alloy system based on submicron distributions of intermetallic phases realised through eutectic solidification in the ternary system Ni-Al-Zr. Various compositions in this system comprising of intermetallic phases distributed in different eutectic structures show ultra-high strength at temperatures upto 700°C combined with reasonable tensile plasticity, exceptional oxidation resistance and high temperature structural stability. Intermetallics have long been used in high temperature alloys systems such as in the classical Ni-base superalloys that derive their strength from nanoscale dispersions of the aluminide, Ni3Al(γ’) in a matrix of disordered fcc Ni (γ), alloyed with expensive, high density refractory elements such as Re and Ru. The high temperature applications of intermetallics derive from their strength retention to high temperatures, creep resistance enabled by low diffusion rates, and attractive oxidation resistance based on high concentration of elements such as Al that forms stable oxides. Several decades of effort on the development of new generation of intermetallic alloys through the 80’s and 90’s have gone unrewarded, with the exception of TiAl based alloys that are now used in recent generation aircraft engines. The promise of intermetallics as high temperature candidate materials is limited by their poor ductility or toughness arising from several intrinsic properties such as low grain boundary cohesive strength (in the case of Ni3Al) or an insufficient number of slip systems (as in NiAl) or extrinsic effects such as embrittlement by hydrogen (Fe3Al) that derive fundamentally from the existence of directionality in bonding. However, low ductility or toughness can often be alleviated by limiting the length scale for slip. We have therefore examined the possibility of combining intermetallics in the form of eutectic structures, potentially limiting slip lengths within each intermetallic constituent. Eutectic structures in binary systems limit the choice of intermetallic combinations so that finding such combinations with engineering potential is difficult. On the other hand combinations of three elements or more would enable a significantly larger set of permutations of eutectic intermetallics, provided the constituent binary phase diagrams contain either eutectic or peritectic reactions involving intermetallic phases, as well as intermediate intermetallic phases. The ternary Ni-Al-Zr system met our criterion in several ways. The Ni-Al binary phase diagram shows a peritectic reaction from liquid and NiAl (Pm 3m, B2 with a lattice parameter of 0.288nm) to form Ni3Al (Pm 3m, L12 with a lattice parameter of 0.356 nm), intermetallics that have been extensively investigated in earlier literature. The Ni-Zr system shows a peritectic reaction between liquid and the Ni7Zr2 (C12/m1 with a lattice parameters a=0.469nm, b=0.823nm, c=1.219nm) phase to form the intermetallic Ni5Zr (F 43m with a lattice parameter of 0.670nm). Further the NiAl and Ni7Zr2 are both intermediate phases… Advisors/Committee Members: Chattopadhyay, K (advisor), Banerjee, Dipankar (advisor).

Subjects/Keywords: Intermetallic Alloys; Nickel-Aluminium-Zirconium Eutectic Alloys; Ni-Al-Zr Alloys; Ternary Alloys; Intermetallic Eutectic Composites; Metallurgy

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APA (6^th Edition):

Tiwary, C. S. (2018). Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2991

Chicago Manual of Style (16^th Edition):

Tiwary, Chandra Sekhar. “Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/2991.

MLA Handbook (7^th Edition):

Tiwary, Chandra Sekhar. “Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys.” 2018. Web. 16 Jan 2021.

Vancouver:

Tiwary CS. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/2991.

Council of Science Editors:

Tiwary CS. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/2991

Indian Institute of Science

3. Padaikathan, P. Development of High Temperature Aluminium Alloys through Microstructure Control.

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

URL: http://etd.iisc.ac.in/handle/2005/3890

► A large number of advanced structural materials are based on metallic materials where alloying additions play a key role in imparting the required properties. Most… (more)

▼ A large number of advanced structural materials are based on metallic materials where alloying additions play a key role in imparting the required properties. Most of the commercially important aluminium alloys are classified by the nature of the alloying additions. Among them the 2219, 2618, 5086, and 7075 are important class of lightweight alloys that plays critical role in modern engineering application. However, despite having a series of commercially useful aluminum alloys for commercial applications the increasing need of improved performance requires newer development in particular for applications that require high strength at elevated temperatures and performance at extreme environments. Precipitations of the intermetallic compounds containing copper during thermal treatments play a very important role in developing high strength aluminium alloys. Although,these precipitates are stable at fairly high temperatures, the rapid coarsening of these second phase precipitates (e.g. Al2Cu), leads to loss of strength at elevated temperature. Several approaches are explored to overcome this problem. One of them is to utilize non-equilibrium solidification route, which can increase solid solubility and hence increasing the precipitate density. Nonequilibrium processing can also alter the selection pathway of the competitive phases and evolution of the microstructure. Recently, non–equilibrium solidification by suction casting technique is becoming increasingly popular for casting of metallic materials of any shape. In this technique solidification is effected by sucking the molten alloy into water cooled copper mold using a suction force resulting from the differences between the melting chamber in Argon gas pressure and casting chamber under vacuum. The present thesis aims to develop a set of newer alloys with small amount of alloying additions primarily based on nickel that can retain reasonable strength at high temperature by utilizing the non-equilibrium solidification route. In addition to Ni (≤ 0.10at.%), the thesis present results of the effect of minor addition of Sc and Zr as ternary and quaternary additions. Following a short review in chapter 2, Chapter 3 presents the experimental techniques adopted for both preparation of alloys and their characterization. Chapter 4 deals with the results of alloying of aluminum with minor amount of nickel. The Ni in the range of 0.05-0.20at% was used to develop a high temperature template, containing a set of hardening intermetallic compounds to increase the strength of the host matrix. The microstructural investigations of the suction cast alloys reveal a characteristic feathery microstructure. At higher magnification the microstructure reveals the presence of fine dispersions of a second phase. Both x-ray and transmission electron microscopy confirms the phase in the dispersions to be primarily crystalline Al9Ni2 phase having a monoclinic crystal structure. This phase does not exist in equilibrium phase diagram. Only at higher concentration one can observe equilibrium… Advisors/Committee Members: Chattopadhyay, Kamanio (advisor).

Subjects/Keywords: Aluminium Alloys - Microstructure Ccontrol; Aluminium High Tempreture; Metallography - Aluminium Alloys; Metallic Material Structure; High Temperature Aluminum Alloys; Al-Ni-Zr Alloys; Al-Ni Alloys; Al-Ni-Sc-Zr Alloys; Materials Engineering

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

APA (6^th Edition):

Padaikathan, P. (2018). Development of High Temperature Aluminium Alloys through Microstructure Control. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3890

Chicago Manual of Style (16^th Edition):

Padaikathan, P. “Development of High Temperature Aluminium Alloys through Microstructure Control.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/3890.

MLA Handbook (7^th Edition):

Padaikathan, P. “Development of High Temperature Aluminium Alloys through Microstructure Control.” 2018. Web. 16 Jan 2021.

Vancouver:

Padaikathan P. Development of High Temperature Aluminium Alloys through Microstructure Control. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/3890.

Council of Science Editors:

Padaikathan P. Development of High Temperature Aluminium Alloys through Microstructure Control. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3890

Indian Institute of Science

4. Srinivasan, Dheepa. Growth Morphology And Coarsening Of Metastable Al3Zr In Melt Spun Al-Ni-Zr Alloys.

Degree: MSc Engg, Faculty of Engineering, 2013, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/1950

Subjects/Keywords: Aluminium Alloys; Aluminium-Nickel-Zinc Alloys; Al-Ni-Zr Alloys; Al3-Zr Alloys; Al-Zr Alloys; Al3Zr; Metallurgy

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APA (6^th Edition):

Srinivasan, D. (2013). Growth Morphology And Coarsening Of Metastable Al3Zr In Melt Spun Al-Ni-Zr Alloys. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/1950

Chicago Manual of Style (16^th Edition):

Srinivasan, Dheepa. “Growth Morphology And Coarsening Of Metastable Al3Zr In Melt Spun Al-Ni-Zr Alloys.” 2013. Masters Thesis, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/1950.

MLA Handbook (7^th Edition):

Srinivasan, Dheepa. “Growth Morphology And Coarsening Of Metastable Al3Zr In Melt Spun Al-Ni-Zr Alloys.” 2013. Web. 16 Jan 2021.

Vancouver:

Srinivasan D. Growth Morphology And Coarsening Of Metastable Al3Zr In Melt Spun Al-Ni-Zr Alloys. [Internet] [Masters thesis]. Indian Institute of Science; 2013. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/1950.

Council of Science Editors:

Srinivasan D. Growth Morphology And Coarsening Of Metastable Al3Zr In Melt Spun Al-Ni-Zr Alloys. [Masters Thesis]. Indian Institute of Science; 2013. Available from: http://etd.iisc.ac.in/handle/2005/1950

5. Fan, Yangyang. Precipitation Strengthening of Aluminum by Transition Metal Aluminides.

Degree: PhD, 2015, Worcester Polytechnic Institute

URL: etd-042815-143652 ; https://digitalcommons.wpi.edu/etd-dissertations/209

► A castable alloy, i.e., one that flows easily to fill the entire mold cavity and also has resistance to hot tearing during solidification, must invariably… (more)

Subjects/Keywords: Al-Mn; Al-Zr-V; Al-Zr; Al-Ni; Transition Metal; Precipitation hardening

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

APA (6^th Edition):

Fan, Y. (2015). Precipitation Strengthening of Aluminum by Transition Metal Aluminides. (Doctoral Dissertation). Worcester Polytechnic Institute. Retrieved from etd-042815-143652 ; https://digitalcommons.wpi.edu/etd-dissertations/209

Chicago Manual of Style (16^th Edition):

Fan, Yangyang. “Precipitation Strengthening of Aluminum by Transition Metal Aluminides.” 2015. Doctoral Dissertation, Worcester Polytechnic Institute. Accessed January 16, 2021. etd-042815-143652 ; https://digitalcommons.wpi.edu/etd-dissertations/209.

MLA Handbook (7^th Edition):

Fan, Yangyang. “Precipitation Strengthening of Aluminum by Transition Metal Aluminides.” 2015. Web. 16 Jan 2021.

Vancouver:

Fan Y. Precipitation Strengthening of Aluminum by Transition Metal Aluminides. [Internet] [Doctoral dissertation]. Worcester Polytechnic Institute; 2015. [cited 2021 Jan 16]. Available from: etd-042815-143652 ; https://digitalcommons.wpi.edu/etd-dissertations/209.

Council of Science Editors:

Fan Y. Precipitation Strengthening of Aluminum by Transition Metal Aluminides. [Doctoral Dissertation]. Worcester Polytechnic Institute; 2015. Available from: etd-042815-143652 ; https://digitalcommons.wpi.edu/etd-dissertations/209

Indian Institute of Science

6. Srinivasan, Dheepa. Phase Evolution, Thermal Stability And Hardness Of Melt Spun Nanocrystalline Al-X-Zr (X=Si,Cu,Ni) Alloys.

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

URL: http://etd.iisc.ac.in/handle/2005/1527

Subjects/Keywords: Aluminium Alloys - Metallography; Aluminium Alloys - Metallurgy; Al Alloys; Al-Si-Zr; Al-Cu-Zr; Al-Ni-Z; Metallurgy

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

APA (6^th Edition):

Srinivasan, D. (2011). Phase Evolution, Thermal Stability And Hardness Of Melt Spun Nanocrystalline Al-X-Zr (X=Si,Cu,Ni) Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/1527

Chicago Manual of Style (16^th Edition):

Srinivasan, Dheepa. “Phase Evolution, Thermal Stability And Hardness Of Melt Spun Nanocrystalline Al-X-Zr (X=Si,Cu,Ni) Alloys.” 2011. Doctoral Dissertation, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/1527.

MLA Handbook (7^th Edition):

Srinivasan, Dheepa. “Phase Evolution, Thermal Stability And Hardness Of Melt Spun Nanocrystalline Al-X-Zr (X=Si,Cu,Ni) Alloys.” 2011. Web. 16 Jan 2021.

Vancouver:

Srinivasan D. Phase Evolution, Thermal Stability And Hardness Of Melt Spun Nanocrystalline Al-X-Zr (X=Si,Cu,Ni) Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2011. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/1527.

Council of Science Editors:

Srinivasan D. Phase Evolution, Thermal Stability And Hardness Of Melt Spun Nanocrystalline Al-X-Zr (X=Si,Cu,Ni) Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2011. Available from: http://etd.iisc.ac.in/handle/2005/1527

7. Fan, Yangyang. Alloying Aluminum with Transition Metals.

Degree: PhD, 2015, Worcester Polytechnic Institute

URL: etd-050415-125629 ; https://digitalcommons.wpi.edu/etd-dissertations/266

► A castable alloy, i.e., one that flows easily to fill the entire mold cavity and also has resistance to hot tearing during solidification, must invariably… (more)

Subjects/Keywords: eutectic; Al-Mn; Al-Ni-Mn; Al-Mn-W; Al-Ni; Precipitation hardening. Al-Zr-V

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

APA (6^th Edition):

Fan, Y. (2015). Alloying Aluminum with Transition Metals. (Doctoral Dissertation). Worcester Polytechnic Institute. Retrieved from etd-050415-125629 ; https://digitalcommons.wpi.edu/etd-dissertations/266

Chicago Manual of Style (16^th Edition):

Fan, Yangyang. “Alloying Aluminum with Transition Metals.” 2015. Doctoral Dissertation, Worcester Polytechnic Institute. Accessed January 16, 2021. etd-050415-125629 ; https://digitalcommons.wpi.edu/etd-dissertations/266.

MLA Handbook (7^th Edition):

Fan, Yangyang. “Alloying Aluminum with Transition Metals.” 2015. Web. 16 Jan 2021.

Vancouver:

Fan Y. Alloying Aluminum with Transition Metals. [Internet] [Doctoral dissertation]. Worcester Polytechnic Institute; 2015. [cited 2021 Jan 16]. Available from: etd-050415-125629 ; https://digitalcommons.wpi.edu/etd-dissertations/266.

Council of Science Editors:

Fan Y. Alloying Aluminum with Transition Metals. [Doctoral Dissertation]. Worcester Polytechnic Institute; 2015. Available from: etd-050415-125629 ; https://digitalcommons.wpi.edu/etd-dissertations/266

Michigan Technological University

8. Fadayomi, Oladeji. INTEGRATED COMPUTATIONAL MATERIALS ENGINEERING (ICME) INVESTIGATION OF ELECTRICAL CONDUCTIVITY AND THERMODYNAMIC STABILITY FOR PRECIPITATION STRENGTHENED Al-Zn-Zr AND Al-Zn-Ni TERNARY ALLOYS.

Degree: PhD, Department of Materials Science and Engineering, 2019, Michigan Technological University

URL: https://digitalcommons.mtu.edu/etdr/792

► High electrical conductivity Al-Zn-TM (TM=Transition metals) alloys with improved mechanical properties and thermal resistance are developed with an integrated computational material engineering (ICME) strategy.… (more)

Subjects/Keywords: Aluminum alloy; Al-Zn-Zr; Al-Zn-Ni; Al-Zr; Al-Ni; DFT; ICME; precipitation; Computational Engineering; Materials Science and Engineering; Metallurgy

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

APA (6^th Edition):

Fadayomi, O. (2019). INTEGRATED COMPUTATIONAL MATERIALS ENGINEERING (ICME) INVESTIGATION OF ELECTRICAL CONDUCTIVITY AND THERMODYNAMIC STABILITY FOR PRECIPITATION STRENGTHENED Al-Zn-Zr AND Al-Zn-Ni TERNARY ALLOYS. (Doctoral Dissertation). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/792

Chicago Manual of Style (16^th Edition):

Fadayomi, Oladeji. “INTEGRATED COMPUTATIONAL MATERIALS ENGINEERING (ICME) INVESTIGATION OF ELECTRICAL CONDUCTIVITY AND THERMODYNAMIC STABILITY FOR PRECIPITATION STRENGTHENED Al-Zn-Zr AND Al-Zn-Ni TERNARY ALLOYS.” 2019. Doctoral Dissertation, Michigan Technological University. Accessed January 16, 2021. https://digitalcommons.mtu.edu/etdr/792.

MLA Handbook (7^th Edition):

Fadayomi, Oladeji. “INTEGRATED COMPUTATIONAL MATERIALS ENGINEERING (ICME) INVESTIGATION OF ELECTRICAL CONDUCTIVITY AND THERMODYNAMIC STABILITY FOR PRECIPITATION STRENGTHENED Al-Zn-Zr AND Al-Zn-Ni TERNARY ALLOYS.” 2019. Web. 16 Jan 2021.

Vancouver:

Fadayomi O. INTEGRATED COMPUTATIONAL MATERIALS ENGINEERING (ICME) INVESTIGATION OF ELECTRICAL CONDUCTIVITY AND THERMODYNAMIC STABILITY FOR PRECIPITATION STRENGTHENED Al-Zn-Zr AND Al-Zn-Ni TERNARY ALLOYS. [Internet] [Doctoral dissertation]. Michigan Technological University; 2019. [cited 2021 Jan 16]. Available from: https://digitalcommons.mtu.edu/etdr/792.

Council of Science Editors:

Fadayomi O. INTEGRATED COMPUTATIONAL MATERIALS ENGINEERING (ICME) INVESTIGATION OF ELECTRICAL CONDUCTIVITY AND THERMODYNAMIC STABILITY FOR PRECIPITATION STRENGTHENED Al-Zn-Zr AND Al-Zn-Ni TERNARY ALLOYS. [Doctoral Dissertation]. Michigan Technological University; 2019. Available from: https://digitalcommons.mtu.edu/etdr/792

9. Yan, Shi. Strengthening Aluminum By Zirconium and Chromium.

Degree: MS, 2013, Worcester Polytechnic Institute

URL: etd-010213-180334 ; https://digitalcommons.wpi.edu/etd-theses/3

► The Al-Zr system is used to form a thermally stable strengthening phase in high temperature aluminum-base casting alloys. These alloys have good strength at elevated… (more)

▼ The Al-Zr system is used to form a thermally stable strengthening phase in high temperature aluminum-base casting alloys. These alloys have good strength at elevated temperature due to the precipitation of coherent metastable Al3Zr particles upon decomposition of the supersaturated Al-Zr solid solution by a carefully designed heat treatment. Formation of the Al3Zr particles occurs by a peritectic reaction, which decrees that once formed, the particles cannot be dissolved by a solid-state homogenization process. Accordingly, melting the alloy must serve as the homogenization step of the precipitation hardening process; and solidification during casting must serve as the quenching step. Unfortunately, a prohibitively fast solidification rate is necessary to obtain a solid solution with as little as 0.4% Zr in Al. It is found that adding Cr to Al-0.4wt%Zr binary alloy makes it easier to form the supersaturated solid solution, and the ternary Al-0.4wt%Zr- 0.8wt%Cr alloy has better room and elevated temperature tensile properties than the binary Al- 0.4wt%Zr alloy. Various one-step and two-step isothermal aging cycles were investigated in order to arrive at the optimum aging schedule for the Al-0.4wt%Zr-0.8wt%Cr. It is found that soaking the alloy at 400C for 24 hours is optimum; and employing a two-step aging schedule reduces the aging time without sacrificing strength. The two- step aging schedule includes soaking the alloy at 375C for 3 hours and then at 425C for an additional 12 hours. Examination of the precipitates that form in the Al-0.4wt%Zr-0.8wt%Cr with High Resolution Transmission Electron Microscopy (HRTEM) shows that they have the L12 crystal structure. Energy Dispersive Spectrometry (EDS) shows that the particles contain only aluminum and zirconium whereas the matrix is a solid solution of chromium in aluminum. Hence, it is suggested that zirconium strengthens the Al- 0.4wt%Zr-0.8wt%Cr alloy by a precipitation hardening mechanism and chromium further enhances the strength by solid solution strengthening. Advisors/Committee Members: Makhlouf M. Makhlouf, Advisor, Richard D. Sisson, Jr., Department Head;.

Subjects/Keywords: High temperature alloys. Al-Cr-Zr; Mechanical Properties; Chemical Composition

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APA (6^th Edition):

Yan, S. (2013). Strengthening Aluminum By Zirconium and Chromium. (Thesis). Worcester Polytechnic Institute. Retrieved from etd-010213-180334 ; https://digitalcommons.wpi.edu/etd-theses/3

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):

Yan, Shi. “Strengthening Aluminum By Zirconium and Chromium.” 2013. Thesis, Worcester Polytechnic Institute. Accessed January 16, 2021. etd-010213-180334 ; https://digitalcommons.wpi.edu/etd-theses/3.

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

MLA Handbook (7^th Edition):

Yan, Shi. “Strengthening Aluminum By Zirconium and Chromium.” 2013. Web. 16 Jan 2021.

Vancouver:

Yan S. Strengthening Aluminum By Zirconium and Chromium. [Internet] [Thesis]. Worcester Polytechnic Institute; 2013. [cited 2021 Jan 16]. Available from: etd-010213-180334 ; https://digitalcommons.wpi.edu/etd-theses/3.

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

Council of Science Editors:

Yan S. Strengthening Aluminum By Zirconium and Chromium. [Thesis]. Worcester Polytechnic Institute; 2013. Available from: etd-010213-180334 ; https://digitalcommons.wpi.edu/etd-theses/3

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

Indian Institute of Science

10. Vinay, K S. Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys.

Degree: MSc Engg, Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/4056

► Nickel based superalloys are high temperature materials which find application as blade and disc components of jet engines due to their ability to retain their… (more)

▼ Nickel based superalloys are high temperature materials which find application as blade and disc components of jet engines due to their ability to retain their mechanical properties at temperatures close to 0.8 of their melting point. The modern day nickel based superalloys are multicomponent alloys, containing up to 12 alloying elements which are added in balanced proportions to achieve high temperature strength and microstructural stability, Re and Ru have been the recent additions made to superalloy compositions in the last two decades. But the roles of Re and Ru in terms of partitioning among the phases γ and γ’ and its effects on mechanical properties are still not clear. Hence an effort was made to study their effects under constrains of constant volume fractions of γ’ and misfit between γ and γ’, to isolate effects that result purely due to composition. Three model alloy systems (two ternary and one quaternary) of the type Ni-Al-xRe, Ni-Al-yRu and Ni-Al-xRe-yRu, x=2.5/4 and y=2.5/6 with minor additions of 1.4 Hf and 0.07 C for reasons of castability were synthesized by investment casting. This thesis deals with the solidification related aspects of these alloys. Chapter 1 deals with a brief overview of Ni based superalloys in terms of their physical metallurgy, processing, microstructure and the effects of Re and Ru studied in literature. These are summarized and the objective of thesis laid out. The experimental details of the techniques employed for studying the cast structure such as optical microscopy, scanning electron microscopy, electron probe microanalysis and differential scanning calorimetry are discussed in Chapter 2 In Chapter 3, the experimental results concerning microstructure, chemistries (local and global), differential scanning calorimetry and supporting Thermo-Calc based simulations are presented. The composition of the directionally solidified alloys were estimated using quantitative EPMA spot analysis after homogenizing them to the best possible extent. The cooling rates experienced by the bottom, middle and tip sections (25mm, 150mm and 295mm respectively from chill plate) of the model alloys during casting was estimated using ProCASTTM simulations. The simulations show the cooling rates to vary from 12.5 K/min to 6 K/min, corresponding to the range of thermal gradients 3000 K/m to 1500 K/m from bottom to tip sections. These estimations were performed assuming a constant withdrawal velocity of 24 cm/hr. The morphological evolution of cast structure from bottom to tip section of the alloys was studied at a coarse scale with the aid of optical microscopy. A tendency towards increased branching of dendrites to form well developed tertiary arms is observed on moving from bottom to tip sections. Quantitative measurement of primary and secondary arm spacings (PDAS and SDAS) indicate that PDAS values increase from bottom to middle section and then saturates, whereas the SDAS values show an increase from bottom to tip sections. Also, the PDAS and SDAS values of MA-3 were observed to be… Advisors/Committee Members: Banerjee, Dipankar (advisor).

Subjects/Keywords: Nickel Based Superalloys; Solidification Alloys; Alloy Composition; Ni-Based Superalloys; Ni-Al-Re/Ru Alloys; Materials Engineering

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

APA (6^th Edition):

Vinay, K. S. (2018). Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/4056

Chicago Manual of Style (16^th Edition):

Vinay, K S. “Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys.” 2018. Masters Thesis, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/4056.

MLA Handbook (7^th Edition):

Vinay, K S. “Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys.” 2018. Web. 16 Jan 2021.

Vancouver:

Vinay KS. Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys. [Internet] [Masters thesis]. Indian Institute of Science; 2018. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/4056.

Council of Science Editors:

Vinay KS. Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys. [Masters Thesis]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/4056

Indian Institute of Science

11. Makineni, Surendra Kumar. Improvement of High Temperature Strength of Al and Co Alloy by L12 Type Coherent Precipitates.

Degree: PhD, Engineering, 2020, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/4348

► The present work aims at developing a new class of high temperature alloys based on ordered intermetallic compound that forms coherently with the matrix during… (more)

Subjects/Keywords: Superalloys; Transmission Electron Microscopy; Atom Probe Tomography; High Temperature; Aluminium Alloys; Cobalt-based Superalloy; Co-Al-Mo-Nb; Co-Mo-Al Alloys; Al-Cu-Nb-Zr Alloys; Al-Cu-Hf-Zr; Metallurgy

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APA (6^th Edition):

Makineni, S. K. (2020). Improvement of High Temperature Strength of Al and Co Alloy by L12 Type Coherent Precipitates. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/4348

Chicago Manual of Style (16^th Edition):

Makineni, Surendra Kumar. “Improvement of High Temperature Strength of Al and Co Alloy by L12 Type Coherent Precipitates.” 2020. Doctoral Dissertation, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/4348.

MLA Handbook (7^th Edition):

Makineni, Surendra Kumar. “Improvement of High Temperature Strength of Al and Co Alloy by L12 Type Coherent Precipitates.” 2020. Web. 16 Jan 2021.

Vancouver:

Makineni SK. Improvement of High Temperature Strength of Al and Co Alloy by L12 Type Coherent Precipitates. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2020. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/4348.

Council of Science Editors:

Makineni SK. Improvement of High Temperature Strength of Al and Co Alloy by L12 Type Coherent Precipitates. [Doctoral Dissertation]. Indian Institute of Science; 2020. Available from: http://etd.iisc.ac.in/handle/2005/4348

Univerzitet u Beogradu

12. Batalović, Katarina, 1984-. Хидриди легура прелазних метала 4. групе са гвожђем и никлом - од електронске структуре до примене за складиштењем водоника.

Degree: Fakultet za fizičku hemiju, 2014, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:7496/bdef:Content/get

►

Физичка хемија - Теоријска физичка хемија чврстог стања / Physical chemistry - Theoretical physical chemistry of the solid state

Имајући у виду значај енергије за… (more)

▼

Физичка хемија - Теоријска физичка хемија чврстог стања / Physical chemistry - Theoretical physical chemistry of the solid state

Имајући у виду значај енергије за људско друштво, проналажење одрживог система њеног добијања, транспорта и коришћења је један од основних задатака модерне науке. Пре нешто више од пола века започета су испитивања металних хидрида као начина складиштења водоника. Време ће показати да ли ће баш водоник бити гориво будућности, али оно што је сигурно је да су сва досадашња испитивања металних хидрида у великој мери допринела разумевању процеса интеракције гасовитог водоника са металима (легурама) и развоју бројних практичних примена метал-водоничних система. Истраживања на овом пољу се настављају, а поред незаобилазних експерименталних испитивања врло значајну улогу имају и методе засноване на теорији функционала густине (DFT), јер омогућавају испитивање модела идеалних или контролисаних система и разумевање фундаменталних веза између састава и структуре материјала и његових особина. Предмет испитивања у овој тези су хидриди легура метала 4. групе (Ti, Zr, Hf) са Ni и Fe као потенцијални материјали за складиштење водоника. Методом FP-(L)APW+lo, која примењује DFT у прорачунима bulk кристалних система, испитана је стабилност легура и хидрида, њихова електронска структура, стабилност различитих кристалних решетки и интерстицијалних позиција. Додатно, применом експерименталних метода испитана је апсорпција и десорпција водоника у легурама HfNi и TiFe1-xNix (x = 0.2 – 0.6). На основу експерименталних испитивања у овој тези и литературних података, испитиване легуре су поређене по особинама од интереса за складиштење водоника: разматрана је термодинамика формирања хидрида (енталпија формирања хидрида, положај равнотежног притиска, температура десорпције водоника...), кинетика процеса апсорпције водоника, капацитет за складиштење. На основу поређења електронске структуре легура и хидрида, размотрена је природа интеракције водоника са металима и трансфер наелектрисања. Термодинамичке величине добијене на основу израчунатих енергија формирања хидридних фаза показују задовољавајуће слагање са експерименталним вредностима, а нарочито добра слагања су добијена у тренду стабилности хидрида различитих легура и температурама десорпције. Нађено је и да промена запремине и кристалне структуре имају дестабилизујући ефекат, док хемијска интеракција водоника са металима легуре има доминантан, стабилизујући ефект у процесу формирања хидрида испитиваних легура. На основу стабилности различитих фаза потврђена је кристална структура ZrNi монохидрида и претпостављена деформација орторомбичне кристане решетке HfNi и Тi0.67Zr0.33Ni при формирању монохидрида; такође је и размотрена могућност постојања орторомбичне монохидридне фазе при хидрирању мартензит ТiNi. На основу уочених трендова, претпоставка је да би модификација легура Ti- Zr-Ni заменом мале количине никла гвожђем могла додатно да дестабилизује орторомбичне хидриде који настају при апсорпцији водоника, без утицаја на кинетику и капацитет апсорпције…

Advisors/Committee Members: Perić, Miljenko, 1949-.

Subjects/Keywords: metal hydride; electronic structure; hydrogen storage; formation energy; DFT; FP (L)APW+lo; (Hf,Zr,Ti)(Ni,Fe) alloys

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APA (6^th Edition):

Batalović, Katarina, 1. (2014). Хидриди легура прелазних метала 4. групе са гвожђем и никлом - од електронске структуре до примене за складиштењем водоника. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:7496/bdef:Content/get

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):

Batalović, Katarina, 1984-. “Хидриди легура прелазних метала 4. групе са гвожђем и никлом - од електронске структуре до примене за складиштењем водоника.” 2014. Thesis, Univerzitet u Beogradu. Accessed January 16, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:7496/bdef:Content/get.

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

MLA Handbook (7^th Edition):

Batalović, Katarina, 1984-. “Хидриди легура прелазних метала 4. групе са гвожђем и никлом - од електронске структуре до примене за складиштењем водоника.” 2014. Web. 16 Jan 2021.

Vancouver:

Batalović, Katarina 1. Хидриди легура прелазних метала 4. групе са гвожђем и никлом - од електронске структуре до примене за складиштењем водоника. [Internet] [Thesis]. Univerzitet u Beogradu; 2014. [cited 2021 Jan 16]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:7496/bdef:Content/get.

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

Council of Science Editors:

Batalović, Katarina 1. Хидриди легура прелазних метала 4. групе са гвожђем и никлом - од електронске структуре до примене за складиштењем водоника. [Thesis]. Univerzitet u Beogradu; 2014. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:7496/bdef:Content/get

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

Indian Institute of Science

13. Mondal, Chandan. Evolution Of Texture And Its Correlation With Microstructure And Mechanical Property Anisotropy In AA7010 Aluminum Alloy.

Degree: PhD, Faculty of Engineering, 2016, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/2552

► Al-Zn-Mg-Cu-Zr based AA7010 aluminum alloy belongs to the class of heat treatable alloys and the semi-finished products are generally produced by hot rolling, forging or… (more)

▼ Al-Zn-Mg-Cu-Zr based AA7010 aluminum alloy belongs to the class of heat treatable alloys and the semi-finished products are generally produced by hot rolling, forging or extrusion processes. It is well known that the thermo-mechanical processing parameters strongly influence both the evolution of texture as well as microstructure in the material. As a result, the semi-finished products exhibit anisotropy in mechanical properties causing legitimate concerns on the applicability of the alloys. In the present thesis, a systematic study on the evolution of texture and microstructure and its implications on the mechanical properties anisotropy of AA7010 alloy has been attempted. A brief introduction on the development of texture and its influence on the anisotropy of the mechanical properties of 7xxx series aluminum alloys is presented first with a view to explore the scopes for further investigation. An overview of the relevant literature is described subsequently. The development of texture and microstructure in an Al-Zn-Mg-Cu-Zr based 7010 aluminum alloy during uneven, hot cross-rolling is presented. Materials processing involves three different types of uneven cross-rolling. The variations in relative intensity of the β-fibre components as a function of cross rolling modes have been investigated. It has been shown that the main attributes to the texture evolution in the present study are (a) cross-rolling and inter-pass annealing that reduce the intensity of Cu component following each successive pass, (b) recrystallization resistance of Bs oriented grains, (c) stability of Bs texture under cross-rolling, and (d) Zener pinning by Al3Zr dispersoids. The stability of the unique single, rotated Brass-{110}(556) component developed in the present alloy, during long term thermal annealing and cold rolling deformation has been systematically investigated further. Subsequently, the influence of development of microstructure and texture on the in-plane anisotropy (AIP) of yield strength, work hardening behavior and yield locus anisotropy has been presented. The AIP and work hardening behavior are evaluated by tensile testing at 0o, 45o and 90o to the rolling direction, whilst yield loci have been generated by Knoop hardness method. It has been observed that in spite of having strong rotated Brass texture, the specimens show low AIP especially in peak aged temper. The in-plane anisotropy (AIP) of yield strength, and work hardening behavior of a heat treated 7010 aluminum alloy sheet having strong, rotated Brass-{110}556 component with different texture intensity and volume fraction of recrystallization has been further evaluated. It is observed that the AIP increases with increase in texture intensity and volume fraction of recrystallization. In the subsequent chapter, the tensile flow and work hardening behavior are described using constitutive equations. Room temperature tensile properties have been evaluated as a function of tensile axis orientations in as-hot rolled as well as peak aged conditions. It has been found… Advisors/Committee Members: Chattopadhyay, K (advisor).

Subjects/Keywords: Aluminum Alloys; Al-Zn-Mg-Cu (7xxx) Alloys; Aluminium Alloys - Microstructure; Aluminium Alloys - Texture - Evolution; Al-Zn-Mg-Cu Alloys - Physical Metallurgy; Wrought Aluminum Alloys; Mechanical Properties Anisotropy; Microstructure; Evolution of Microstructure; AA7010 Aluminum Alloy; Al-Zn-Mg-Cu-Zr; Materials Science

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

APA (6^th Edition):

Mondal, C. (2016). Evolution Of Texture And Its Correlation With Microstructure And Mechanical Property Anisotropy In AA7010 Aluminum Alloy. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2552

Chicago Manual of Style (16^th Edition):

Mondal, Chandan. “Evolution Of Texture And Its Correlation With Microstructure And Mechanical Property Anisotropy In AA7010 Aluminum Alloy.” 2016. Doctoral Dissertation, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/2552.

MLA Handbook (7^th Edition):

Mondal, Chandan. “Evolution Of Texture And Its Correlation With Microstructure And Mechanical Property Anisotropy In AA7010 Aluminum Alloy.” 2016. Web. 16 Jan 2021.

Vancouver:

Mondal C. Evolution Of Texture And Its Correlation With Microstructure And Mechanical Property Anisotropy In AA7010 Aluminum Alloy. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2016. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/2552.

Council of Science Editors:

Mondal C. Evolution Of Texture And Its Correlation With Microstructure And Mechanical Property Anisotropy In AA7010 Aluminum Alloy. [Doctoral Dissertation]. Indian Institute of Science; 2016. Available from: http://etd.iisc.ac.in/handle/2005/2552

Indian Institute of Science

14. Srivastava, Dinesh. Beta Phase Transformations In Zirconium Base Alloys.

Degree: PhD, Faculty of Engineering, 2012, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/1596

Subjects/Keywords: Phase Transformations (Statistical Physics); Alloys; Binary Systems (Metallurgy); Zirconium Alloys; Zr-Nb Alloys; Zr-Ni Alloys; Metallurgy

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

APA (6^th Edition):

Srivastava, D. (2012). Beta Phase Transformations In Zirconium Base Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/1596

Chicago Manual of Style (16^th Edition):

Srivastava, Dinesh. “Beta Phase Transformations In Zirconium Base Alloys.” 2012. Doctoral Dissertation, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/1596.

MLA Handbook (7^th Edition):

Srivastava, Dinesh. “Beta Phase Transformations In Zirconium Base Alloys.” 2012. Web. 16 Jan 2021.

Vancouver:

Srivastava D. Beta Phase Transformations In Zirconium Base Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2012. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/1596.

Council of Science Editors:

Srivastava D. Beta Phase Transformations In Zirconium Base Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2012. Available from: http://etd.iisc.ac.in/handle/2005/1596

15. Δεπούντης, Σπυρίδων. Ανάπτυξη και εφαρμογή μεθόδων αντιδιαβρωτικής προστασίας κραμάτων αλουμινίου φιλικών προς το περιβάλλον.

Degree: 2012, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/27886

► In this PhD thesis we develop innovative, environmentally friendly, corrosion protective coatings for Al and Al alloys. We focus on conversion coatings based on the… (more)

▼ In this PhD thesis we develop innovative, environmentally friendly, corrosion protective coatings for Al and Al alloys. We focus on conversion coatings based on the intrinsically conductive polymer of polypyrrole (PPY), as well as on coatings based on silanes, Ti and Zr oxides. Corrosion performance testing of Al surfaces prepared by these coatings confirm the compatibility with the paint /finish PPY-based coatings were deposited onto the Al surface by means of in-situ polymerization methodology. At the optimized process conditions dense and uniform conversion coatings were delivered, as examined by means of Fourier-Transformed Infra-Red Spectroscopy (FTIT) and X-Rays Photoelectron Spectroscopy (XPX) (No Al peaks at the as-deposited specimens). Our coatings passed corrosion testing, thus proposing a rather promising method for the corrosion protection of Al and Al alloys. Our approach employs aqueous solutions, does not make use of hexavalent Cr and necessitate less water supply and energy, and thus is economically favored, compared to the conventional industrial method of chromating. However, the short pot life of the PPY solution hinders the large scale continuous production applicability, even though the final corrosion protection performance of PPY-based coatings is comparable to that of chromating. Based on the promising results of the PPY-based coatings we exploited PPY as a pigment towards a novel primer formulation. PPY load up to 3%wt in alkydic resin improves the corrosion protection performance of Al alloys, compared to ZnCrO4 pigmented resin. Electrochemical corrosion testing shifts the open circuit potential of the coated Al electrodes, indicating that PPY is electrochemically active within the resin matrix. Corrosion protection of Al alloys, Al 5005 in particular, was also pursued using silane-based coatings deposited via sol-gel method. First we tested the following formulation of silanes: Dynasylan SIVO 110, Dynasylan SIVO 111 and Synasylan SIVO 113. Corrosion current density (icorr) from Tafel polarization curves was 11-fold smaller compared to the reference specimen. Scanning Electron Microscopy (SEM) imaging of these samples indicate a thin, dense layer. X-ray Fluorescence (XRF) confirmed high Si concentration, while FTIR analysis shown the presence of Al–O–Si and Si–O–Si bonds on the metal surface. The formulation that consisted from Dynasylan SIVO 110 and Dynasylan SIVO 112 attained a 13-fold smaller icorr compared to the reference specimen. From anticorrosion perspective this result is rather satisfactory. Water contact angle measurements show an increase in the hydrophobicity of these coating, which is consistent with improved corrosion protection performance in aqueous corrosive environments. Formulations based on Zr compounds exhibited lower icorr compared to the reference specimen. SEM imaging reveal the formation of dendrite-like structures, that were grown throughout the coating, while the coating thickness in-between the dendrites is about 2-3 nm. The increased content of Zr, Si, O and…

Subjects/Keywords: Αντιδιαβρωτική προστασία κραμάτων Αλουμινίου; Αντιδιαβρωτική επικάλυψη Al με PPY ως αντιδιαβρωτικό πιγμέντο; Η PPY ως αντιδιαβρωτική επικάλυψη μετατροπής κραμάτων Al; Αντιδιαβρωτικές επικαλύψεις Al με βάση τα σιλάνια Dynasilan SIVO; Επικαλύψεις Al που έχουν ως βάση ενώσεις του Zr; Επικαλύψεις Al με συνδυασμό ενώσεων του Zr και Ti; Προποξείδιο του Zr, TSPI; H2TiF6, H2ZrF6, Gardobond 4707; Al alloys anticorrosive protection; Al anticorrosive coating with PPY as pigment; PPY as anticorrosive conversion coating for Al Alloys; Al anticorrosive coatings based on silanes Dynasilan SIVO; Al coatings based on Zr compounds; Al coatings with combination of Zr and Ti compounds; Zr propoxide, TSPI; H2TiF6, H2ZrF6, Gardobond 4707

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

APA (6^th Edition):

Δεπούντης, . �. (2012). Ανάπτυξη και εφαρμογή μεθόδων αντιδιαβρωτικής προστασίας κραμάτων αλουμινίου φιλικών προς το περιβάλλον. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/27886

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):

Δεπούντης, Σπυρίδων. “Ανάπτυξη και εφαρμογή μεθόδων αντιδιαβρωτικής προστασίας κραμάτων αλουμινίου φιλικών προς το περιβάλλον.” 2012. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed January 16, 2021. http://hdl.handle.net/10442/hedi/27886.

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

MLA Handbook (7^th Edition):

Δεπούντης, Σπυρίδων. “Ανάπτυξη και εφαρμογή μεθόδων αντιδιαβρωτικής προστασίας κραμάτων αλουμινίου φιλικών προς το περιβάλλον.” 2012. Web. 16 Jan 2021.

Vancouver:

Δεπούντης �. Ανάπτυξη και εφαρμογή μεθόδων αντιδιαβρωτικής προστασίας κραμάτων αλουμινίου φιλικών προς το περιβάλλον. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2012. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/10442/hedi/27886.

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

Council of Science Editors:

Δεπούντης �. Ανάπτυξη και εφαρμογή μεθόδων αντιδιαβρωτικής προστασίας κραμάτων αλουμινίου φιλικών προς το περιβάλλον. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2012. Available from: http://hdl.handle.net/10442/hedi/27886

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

Indian Institute of Science

16. Bhaskar, Mithipati Siva. Precipitate Growth and Coarsening in Ternary Alloys.

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

URL: http://etd.iisc.ac.in/handle/2005/3976

► We have studied precipitate growth and coarsening in ternary alloys using two different phase held models. The first one is a ternary extension of the… (more)

▼ We have studied precipitate growth and coarsening in ternary alloys using two different phase held models. The first one is a ternary extension of the classical Cahn-Hilliard (C-H) model in which both the phases are characterized using conserved held variables i.e. composition (cB; cC ); mobility matrix and gradient energy efficient are the other input parameters in this model. In the second model, each phase is treated as separate, and phase identify cation is through a (non-conserved) phase held variable ; we have used a grand potential-based (GP) formulation, due to Plapp [1], Choudhury and Nestler [2], where interfacial energy and interface width, as well as free energy and diffusivity matrix for the relevant phases are the input parameters. The first model i.e. the Cahn-Hilliard (C-H) type model is conceptually simple. The model for ternary is a straight forward extension of the binary. The grand potential (GP) formulation has the advantage of being able to incorporate thermodynamic database like Thermocalc in it. We present below a summary of the findings of our research on (a) precipitate growth, precipitate coarsening, and (c) a critical comparison between results from phase held simulations and those from experiments on an Ni-Al-Mo alloy Precipitate growth In our study of precipitate growth in ternary alloys, we end that when both the solute elements have the same diffusivity, precipitate growth behaviour in ternary alloys is identical to that binary alloys; specifically, we recover the temporal power law r2 = kgt relating the particle radius to time, and the growth kg depends only on supersaturation (i.e., equilibrium volume fraction of the precipitate phase), and is independent of the slope of the tie line. However, when one solute element, (say, C) di uses slower than the other (i.e. (DCC =DBB) < 1,(where DBB, DCC are intertie suavities’ in the lab frame of reference), the ux of C at the interface is smaller than that of species B, causing the precipitate to become depleted in C and enriched in B; this process continues until the growth phase enters a scaling regime where we recover the temporal law for growth: r2 = kgt. In this regime, the tie line selected by the precipitate and matrix interfacial compositions is different from the thermodynamic tie line containing the alloy, a result first reported by Coates [3]. After validating our phase held model quantitatively through a critical comparison with Coates' theory of tie line selection, we have characterized the growth behaviour: specifically, we end that growth kg drops with decreasing value of DCC ; the magnitude of this drop is stronger for alloys which (a) are on higher-C tie lines (i.e., the slope of the tie line is higher), and (b) have smaller precipitate volume fractions. Precipitate coarsening In our simulations, we end that precipitate coarsening does indeed enter a scaling regime where the temporal power law r3 = kt (which relates the average precipitate radius r to (b) time t) is valid; the coarsening rate k depends, as expected,… Advisors/Committee Members: Abinandanan, T A (advisor).

Subjects/Keywords: Ternery Alloys; Ternery Alloys - Precipitate Growth; Precipitate Coarsening; Cahn-Hilliard Model; Grand Potential Model; Ni-Al-Mo Alloys; Coates' Theory; Multicomponent Alloys; Materials Engineering

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

APA (6^th Edition):

Bhaskar, M. S. (2018). Precipitate Growth and Coarsening in Ternary Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3976

Chicago Manual of Style (16^th Edition):

Bhaskar, Mithipati Siva. “Precipitate Growth and Coarsening in Ternary Alloys.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/3976.

MLA Handbook (7^th Edition):

Bhaskar, Mithipati Siva. “Precipitate Growth and Coarsening in Ternary Alloys.” 2018. Web. 16 Jan 2021.

Vancouver:

Bhaskar MS. Precipitate Growth and Coarsening in Ternary Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/3976.

Council of Science Editors:

Bhaskar MS. Precipitate Growth and Coarsening in Ternary Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3976

17. Du, Ningning. Multi-scale Modeling of Deformation and Failure Mechanisms of Al Alloys at Elevated Temperature.

Degree: PhD, Division of Engineering. Mechanics of Solids, 2009, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:193/

► When deformed at elevated temperature and slow strain rates, some Al alloys exhibits superplasticity, the ability to sustain very large tensile elongations (sometimes over 1000%)… (more)

Subjects/Keywords: Al alloys

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

APA (6^th Edition):

Du, N. (2009). Multi-scale Modeling of Deformation and Failure Mechanisms of Al Alloys at Elevated Temperature. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:193/

Chicago Manual of Style (16^th Edition):

Du, Ningning. “Multi-scale Modeling of Deformation and Failure Mechanisms of Al Alloys at Elevated Temperature.” 2009. Doctoral Dissertation, Brown University. Accessed January 16, 2021. https://repository.library.brown.edu/studio/item/bdr:193/.

MLA Handbook (7^th Edition):

Du, Ningning. “Multi-scale Modeling of Deformation and Failure Mechanisms of Al Alloys at Elevated Temperature.” 2009. Web. 16 Jan 2021.

Vancouver:

Du N. Multi-scale Modeling of Deformation and Failure Mechanisms of Al Alloys at Elevated Temperature. [Internet] [Doctoral dissertation]. Brown University; 2009. [cited 2021 Jan 16]. Available from: https://repository.library.brown.edu/studio/item/bdr:193/.

Council of Science Editors:

Du N. Multi-scale Modeling of Deformation and Failure Mechanisms of Al Alloys at Elevated Temperature. [Doctoral Dissertation]. Brown University; 2009. Available from: https://repository.library.brown.edu/studio/item/bdr:193/

Indian Institute of Science

18. Suryawanshi, Jyoti Balaji. Mechanical and Corrosion Properties of Selective Laser Melted Alloys.

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

URL: http://etd.iisc.ac.in/handle/2005/3604

► Selective laser melting (SLM) of metallic powders is an additive manufacturing technique that is widely employed to produce 3D components, and is fast becoming an… (more)

▼ Selective laser melting (SLM) of metallic powders is an additive manufacturing technique that is widely employed to produce 3D components, and is fast becoming an important method for manufacturing near-net shape and complex metallic parts. In this thesis, a comprehensive investigation on the effect of SLM on the mechanical and corrosion properties of the Al-12Si (AS), 316L stainless steel (SS), and 18(Ni)-300 grade managing steel (MS) is investigated, with particular emphasis on the developing (micro- as well as mesa-)structure -property correlations. Detailed microstructural characterization combined with quasi-static tensile, fracture toughness, fatigue crack growth, and unmatched fatigue tests were conducted. The effect of post-SLM heat treatment as well as the scanning strategy (linear vs. checker board hatch style) was examined and the results are compared with those of conventionally manufactured (CM) counterparts. The SLM alloys exhibit a mesostructured, in addition to the fine cellular structure along the boundaries. In a case of SLM-AS, the fine cellular structure imparts higher strength at the cost of ductility, while the mesostructured, which arises due to the laser track hatching, causes the crack path to be tortuous, and in turn leads to substantial increase in fracture toughness. This imparts significant anisotropy to the toughness while tensile properties are nearly-isotropic. The experimental results of SLM-SS also show that higher tensile strengths properties with a marked reduction ductility. In spite of these, the fracture toughness, which ranges between 63 and 87 MPa.m0.5, of the SLM-SS is good, which is a result of the mesostructured induced crack tortuousity.Both tensile and toughness properties of SLM-SS were found to be anisotropic in nature. Upon aging SLM-MS, nanoscale precipitation of intermetallic compounds occurs within the cells that, in turn, lead in marked improvements in tensile strengths properties, but substantial reductions in ductility and fracture toughness. Overall, the mechanical performance, except ductility, of the SLM-MS after aging is found to be similar to that of CM-MS. Importantly, the lack of ductility does not lead to a reduction in toughness. Although the SLM-MS alloy possesses a mesostructured, no significant anisotropy in the mechanical behaviour is observed. The unnoticed studies on SLM-AS, -SS, and -MS reveal that the tensile residual stresses, gas-pores, and unmelted powder particles, can degrade the unmatched highest fatigue properties considerably and hence need be eliminated for high fatigue strength. Room temperature, electrochemical corrosion resistances (CRs) of SLM-AS, -SS and -MS in 0.1M NaCl solution were also evaluated and compared with those CM counterparts. While SLM improves CRs of AS and SS, it degrades that of MS. The results are discussed in terms of microstructural refinement and porosity that are common in SLM alloys. Advisors/Committee Members: Ramamurty, Upadrasta (advisor).

Subjects/Keywords: Laser Melted Alloys; SLM Alloys; Al-12Si Alloy; Selective Laser Melting (SLM); 316L Stainless Steel; Selective Laser Melted Alloys; 18(Ni) 300-grade Maraging Steel; Materials Engineering

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

APA (6^th Edition):

Suryawanshi, J. B. (2018). Mechanical and Corrosion Properties of Selective Laser Melted Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3604

Chicago Manual of Style (16^th Edition):

Suryawanshi, Jyoti Balaji. “Mechanical and Corrosion Properties of Selective Laser Melted Alloys.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/3604.

MLA Handbook (7^th Edition):

Suryawanshi, Jyoti Balaji. “Mechanical and Corrosion Properties of Selective Laser Melted Alloys.” 2018. Web. 16 Jan 2021.

Vancouver:

Suryawanshi JB. Mechanical and Corrosion Properties of Selective Laser Melted Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/3604.

Council of Science Editors:

Suryawanshi JB. Mechanical and Corrosion Properties of Selective Laser Melted Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3604

University of Manchester

19. Paa-Rai, Chuleeporn. Optimising precipitate shape and habit for strengthening in magnesium alloys.

Degree: PhD, 2016, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/optimising-precipitate-shape-and-habit-for-strengthening-in-magnesium-alloys(b3e27781-10e0-4c6c-b54d-46bfd6b56b15).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.727857

► Mg-Zn-Zr (ZK) alloys are widely employed in weight critical applications due to their high specific strength properties. Zinc and zirconium are added into the alloy… (more)

▼ Mg-Zn-Zr (ZK) alloys are widely employed in weight critical applications due to their high specific strength properties. Zinc and zirconium are added into the alloy for the purpose of forming precipitation hardening and grain refinement, respectively. However, both elements are likely to form some intermetallic compounds and may have effect on strengthening of the alloys. The purpose of this work was to explore this interaction to understand how to optimise the composition and processing of ZK alloys. In the present study, ZK60 with composition of 6 wt.%Zn and 0.6 wt.%Zr was heat treated by solutionizing and aging at various temperatures and times. The resultant microstructure was characterised by using optical microscope, X-ray Diffractometer (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM) and the age hardening response determined by using Vicker's microhardeness testing. The results show that the interaction between zinc and zirconium causes stable compound formation, including hcp (Zn_2Zr) Laves phase and cubic Zn_2Zr phase. These compounds are distributed unevenly, causing beta'_1 strengthening precipitate to form inhomogeneously during aging. This reduces the strengthening effect of aging, e.g. low age hardening response. It has been shown that the areas containing Zn_2Zr particles are essentially free of strengthening beta'_1 precipitates, an undesirable microstructure. The aged hardening and strengthening of ZK60 alloys accounting for the interaction between Zn and Zr has been explored through a new model for ZK alloys. The simulated age hardening strengthening in ZK60 is similar to the combination of the grain size strengthening and solution strengthening. The prediction has shown that the benefit of adding zirconium, which is grain boundary strengthening improvement by refining grain size, is balanced by a depletion in age hardening response. The total strength is estimated to increase by 15% if the grain size, that is normally obtained by zirconium alloying, could be achieved by another grain refinement method without the loss of zinc solute. The experiments and the models have identified the importance of considering the interaction between Zn and Zr when optimising the processing and composition of ZK magnesium alloys. That had never been emphasised and very well presented. In particular, when ZK alloys are used in wrought applications, control of grain size by recrystallisation rather than Zr may be beneficial in enabling a greater age hardening response.

Subjects/Keywords: 620.1; Zn-Zr interaction; Precipitation; Magnesium Alloys

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

APA (6^th Edition):

Paa-Rai, C. (2016). Optimising precipitate shape and habit for strengthening in magnesium alloys. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/optimising-precipitate-shape-and-habit-for-strengthening-in-magnesium-alloys(b3e27781-10e0-4c6c-b54d-46bfd6b56b15).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.727857

Chicago Manual of Style (16^th Edition):

Paa-Rai, Chuleeporn. “Optimising precipitate shape and habit for strengthening in magnesium alloys.” 2016. Doctoral Dissertation, University of Manchester. Accessed January 16, 2021. https://www.research.manchester.ac.uk/portal/en/theses/optimising-precipitate-shape-and-habit-for-strengthening-in-magnesium-alloys(b3e27781-10e0-4c6c-b54d-46bfd6b56b15).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.727857.

MLA Handbook (7^th Edition):

Paa-Rai, Chuleeporn. “Optimising precipitate shape and habit for strengthening in magnesium alloys.” 2016. Web. 16 Jan 2021.

Vancouver:

Paa-Rai C. Optimising precipitate shape and habit for strengthening in magnesium alloys. [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2021 Jan 16]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/optimising-precipitate-shape-and-habit-for-strengthening-in-magnesium-alloys(b3e27781-10e0-4c6c-b54d-46bfd6b56b15).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.727857.

Council of Science Editors:

Paa-Rai C. Optimising precipitate shape and habit for strengthening in magnesium alloys. [Doctoral Dissertation]. University of Manchester; 2016. Available from: https://www.research.manchester.ac.uk/portal/en/theses/optimising-precipitate-shape-and-habit-for-strengthening-in-magnesium-alloys(b3e27781-10e0-4c6c-b54d-46bfd6b56b15).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.727857

University of Manchester

20. Paa-Rai, Chuleeporn. Optimising Precipitate Shape and Habit for Strengthening in Magnesium Alloys.

Degree: 2016, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300617

► Mg-Zn-Zr (ZK) alloys are widely employed in weight critical applications due to their high specific strength properties. Zinc and zirconium are added into the alloy… (more)

▼ Mg-Zn-Zr (ZK) alloys are widely employed in weight critical applications due to their high specific strength properties. Zinc and zirconium are added into the alloy for the purpose of forming precipitation hardening and grain refinement, respectively. However, both elements are likely to form some intermetallic compounds and may have effect on strengthening of the alloys. The purpose of this work was to explore this interaction to understand how to optimise the composition and processing of ZK alloys. In the present study, ZK60 with composition of 6 wt.%Zn and 0.6 wt.%Zr was heat treated by solutionizing and aging at various temperatures and times. The resultant microstructure was characterised by using optical microscope, X-ray Diffractometer (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM) and the age hardening response determined by using Vicker's microhardeness testing. The results show that the interaction between zinc and zirconium causes stable compound formation, including hcp (Zn_2Zr) Laves phase and cubic Zn_2Zr phase. These compounds are distributed unevenly, causing beta'_1 strengthening precipitate to form inhomogeneously during aging. This reduces the strengthening effect of aging, e.g. low age hardening response. It has been shown that the areas containing Zn_2Zr particles are essentially free of strengthening beta'_1 precipitates, an undesirable microstructure. The aged hardening and strengthening of ZK60 alloys accounting for the interaction between Zn and Zr has been explored through a new model for ZK alloys. The simulated age hardening strengthening in ZK60 is similar to the combination of the grain size strengthening and solution strengthening. The prediction has shown that the benefit of adding zirconium, which is grain boundary strengthening improvement by refining grain size, is balanced by a depletion in age hardening response. The total strength is estimated to increase by 15% if the grain size, that is normally obtained by zirconium alloying, could be achieved by another grain refinement method without the loss of zinc solute. The experiments and the models have identified the importance of considering the interaction between Zn and Zr when optimising the processing and composition of ZK magnesium alloys. That had never been emphasised and very well presented. In particular, when ZK alloys are used in wrought applications, control of grain size by recrystallisation rather than Zr may be beneficial in enabling a greater age hardening response. Advisors/Committee Members: Robson, Joseph.

Subjects/Keywords: Magnesium Alloys; Precipitation; Zn-Zr interaction

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

APA (6^th Edition):

Paa-Rai, C. (2016). Optimising Precipitate Shape and Habit for Strengthening in Magnesium Alloys. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300617

Chicago Manual of Style (16^th Edition):

Paa-Rai, Chuleeporn. “Optimising Precipitate Shape and Habit for Strengthening in Magnesium Alloys.” 2016. Doctoral Dissertation, University of Manchester. Accessed January 16, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300617.

MLA Handbook (7^th Edition):

Paa-Rai, Chuleeporn. “Optimising Precipitate Shape and Habit for Strengthening in Magnesium Alloys.” 2016. Web. 16 Jan 2021.

Vancouver:

Paa-Rai C. Optimising Precipitate Shape and Habit for Strengthening in Magnesium Alloys. [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2021 Jan 16]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300617.

Council of Science Editors:

Paa-Rai C. Optimising Precipitate Shape and Habit for Strengthening in Magnesium Alloys. [Doctoral Dissertation]. University of Manchester; 2016. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300617

21. WANG DONG. Glass forming ability of binary ZR-CU and ternary ZR-CU-AL alloys.

Degree: 2008, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/16023

Subjects/Keywords: Bulk Metallic Glasses; Bulk Metallic Glasses Matrix Composite; Eutectic; Microstructure; Glass Forming Ability; Zr-Cu and Zr-Cu-Al alloys

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

APA (6^th Edition):

DONG, W. (2008). Glass forming ability of binary ZR-CU and ternary ZR-CU-AL alloys. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/16023

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):

DONG, WANG. “Glass forming ability of binary ZR-CU and ternary ZR-CU-AL alloys.” 2008. Thesis, National University of Singapore. Accessed January 16, 2021. http://scholarbank.nus.edu.sg/handle/10635/16023.

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

MLA Handbook (7^th Edition):

DONG, WANG. “Glass forming ability of binary ZR-CU and ternary ZR-CU-AL alloys.” 2008. Web. 16 Jan 2021.

Vancouver:

DONG W. Glass forming ability of binary ZR-CU and ternary ZR-CU-AL alloys. [Internet] [Thesis]. National University of Singapore; 2008. [cited 2021 Jan 16]. Available from: http://scholarbank.nus.edu.sg/handle/10635/16023.

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

Council of Science Editors:

DONG W. Glass forming ability of binary ZR-CU and ternary ZR-CU-AL alloys. [Thesis]. National University of Singapore; 2008. Available from: http://scholarbank.nus.edu.sg/handle/10635/16023

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

22. Déo, Leonardo Pratavieira. Verificação da precisão de um critério para a seleção de composições formadoras de vidro em ligas metálicas do ternário Zr-Ni-Cu.

Degree: Mestrado, Ciência e Engenharia de Materiais, 2011, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/88/88131/tde-14122011-142544/ ;

►

No presente trabalho verificou-se a precisão de um critério que prevê composições de ligas vítreas aplicado ao sistema Zr-Ni-Cu. Este critério combina o parâmetro de… (more)

▼

No presente trabalho verificou-se a precisão de um critério que prevê composições de ligas vítreas aplicado ao sistema Zr-Ni-Cu. Este critério combina o parâmetro de instabilidade topológica (\'lâmbda\'), e o parâmetro termodinâmico (\'deltah́) entre os elementos de liga. Os dois parâmetros correlacionam quantitativamente à composição química a tendência à formação de vidros metálicos. Este critério é uma ferramenta promissora e simples para guiar e reduzir o trabalho tedioso e intensivo de encontrar composições altas tendências a vitrificação em sistemas metálicos. Para comprovar a eficiência desta ferramenta, a metodologia foi calcular o parâmetro para o sistema de interesse e preparar ligas de acordo com algumas composições fornecidas. A metodologia de preparação das ligas seguiu a fusão a arco elétrico e subsequentemente o emprego das técnicas de resfriamento rápido, melt-spinning e splat-cooling, para a produção de fitas e discos metálicos respectivamente, e o coquilhamento para a produção de amostras maciças em forma de cunha. Para as amostras confeccionadas por melt-spinning e splat-cooling, verificou-se a precisão do critério de seleção através da quantificação das porcentagens de fases vítreas a partir de análises de difratogramas de raios-X e seus comportamentos térmicos a partir dos termogramas de análises por calorimetria exploratória diferencial (DSC). Já para as ligas coquilhadas em cunha, obtiveram-se alguns resultados com indícios de estruturas vítreas que foram caracterizadas por difração de raios-X e metalografia. Desta forma chegou-se à conclusão que o critério de seleção aplicado ao sistema Zr-Ni-Cu pode ser utilizado para o desenvolvimento de composições favoráveis à formação de vidro antes da produção das ligas. Conclui-se que o critério que combina o parâmetro de instabilidade topológica (\'lâmbdaḿin) e o parâmetro termodinâmico (\'deltah́) é uma ferramenta que pode ser utilizada como guia para encontrar as composições mais fáceis de formar vidro, reduzindo assim o trabalho experimental de tentativa e erro.

In the present work it was verified the accuracy of a proposed criterion to predict compositions of glassy alloys applied in the Zr-Ni-Cu system. This criterion combines the topological instability parameter (\'lâmbda\') and a thermodynamic parameter (\'deltah́) among the alloying elements. The two parameters correlate quantitatively the chemical composition with the glass forming ability. This criterion is a promising and simple tool to guide and reduce the tedious and intensive work of finding good compositions of glasses in metallic systems. In an attempt to prove the efficiency of such tool, the methodology was to calculate the parameter for the system of interest and prepare alloys in accordance with the compositions provided by the tool. The methodology of preparation of the alloys followed the electric arc- melting and subsequent use of fast cooling techniques, melt-spinning and splat-cooling for the production of metallic ribbons and discs, respectively, and a…

Advisors/Committee Members: Oliveira, Marcelo Falcão de.

Subjects/Keywords: Estruturas vítreas; Glass structures; Instabilidade topológica; Metalurgia física; Physical metallurgy; Sistema Zr-Ni-Cu; Topological instability; Zr-Ni-Cu system

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

APA (6^th Edition):

Déo, L. P. (2011). Verificação da precisão de um critério para a seleção de composições formadoras de vidro em ligas metálicas do ternário Zr-Ni-Cu. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/88/88131/tde-14122011-142544/ ;

Chicago Manual of Style (16^th Edition):

Déo, Leonardo Pratavieira. “Verificação da precisão de um critério para a seleção de composições formadoras de vidro em ligas metálicas do ternário Zr-Ni-Cu.” 2011. Masters Thesis, University of São Paulo. Accessed January 16, 2021. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-14122011-142544/ ;.

MLA Handbook (7^th Edition):

Déo, Leonardo Pratavieira. “Verificação da precisão de um critério para a seleção de composições formadoras de vidro em ligas metálicas do ternário Zr-Ni-Cu.” 2011. Web. 16 Jan 2021.

Vancouver:

Déo LP. Verificação da precisão de um critério para a seleção de composições formadoras de vidro em ligas metálicas do ternário Zr-Ni-Cu. [Internet] [Masters thesis]. University of São Paulo; 2011. [cited 2021 Jan 16]. Available from: http://www.teses.usp.br/teses/disponiveis/88/88131/tde-14122011-142544/ ;.

Council of Science Editors:

Déo LP. Verificação da precisão de um critério para a seleção de composições formadoras de vidro em ligas metálicas do ternário Zr-Ni-Cu. [Masters Thesis]. University of São Paulo; 2011. Available from: http://www.teses.usp.br/teses/disponiveis/88/88131/tde-14122011-142544/ ;

Michigan Technological University

23. McNamara, Cameron. Thermomechanical Processing of Aluminum Micro-alloyed with Sc, Zr, Ti, B, and C.

Degree: PhD, Department of Materials Science and Engineering, 2016, Michigan Technological University

URL: https://digitalcommons.mtu.edu/etdr/240

► Critical exploration of the minimalistic high strength low alloy aluminum (HSLA-Al) paradigm is necessary for the continued development of advanced aluminum alloys. In this… (more)

Subjects/Keywords: Al-Sc-Zr; HSLA-Al; EBSD; aging; recrystallization; Metallurgy

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

APA (6^th Edition):

McNamara, C. (2016). Thermomechanical Processing of Aluminum Micro-alloyed with Sc, Zr, Ti, B, and C. (Doctoral Dissertation). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/240

Chicago Manual of Style (16^th Edition):

McNamara, Cameron. “Thermomechanical Processing of Aluminum Micro-alloyed with Sc, Zr, Ti, B, and C.” 2016. Doctoral Dissertation, Michigan Technological University. Accessed January 16, 2021. https://digitalcommons.mtu.edu/etdr/240.

MLA Handbook (7^th Edition):

McNamara, Cameron. “Thermomechanical Processing of Aluminum Micro-alloyed with Sc, Zr, Ti, B, and C.” 2016. Web. 16 Jan 2021.

Vancouver:

McNamara C. Thermomechanical Processing of Aluminum Micro-alloyed with Sc, Zr, Ti, B, and C. [Internet] [Doctoral dissertation]. Michigan Technological University; 2016. [cited 2021 Jan 16]. Available from: https://digitalcommons.mtu.edu/etdr/240.

Council of Science Editors:

McNamara C. Thermomechanical Processing of Aluminum Micro-alloyed with Sc, Zr, Ti, B, and C. [Doctoral Dissertation]. Michigan Technological University; 2016. Available from: https://digitalcommons.mtu.edu/etdr/240

24. Μεργιά, Κωνσταντία. Μελέτη αλλαγών φάσης με σκέδαση νετρονίων σε μικρές γωνίες.

Degree: 1997, Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ); National and Kapodistrian University of Athens

URL: http://hdl.handle.net/10442/hedi/12283

►

ΣΤΗ ΔΙΔΑΚΤΟΡΙΚΗ ΑΥΤΗ ΕΡΓΑΣΙΑ ΕΞΕΤΑΖΟΝΤΑΙ ΣΤΟ Α'ΜΕΡΟΣ ΟΙ ΑΛΛΑΓΕΣ ΦΑΣΗΣ ΠΟΥ ΥΦΙΣΤΑΝΤΑΙ ΔΙΑΦΟΡΑ ΣΥΣΤΗΜΑΤΑ ΚΡΑΜΑΤΩΝ(A1-LI,A1-ZN,SI) ΜΕΣΩ ΤΟΥ ΣΧΗΜΑΤΙΣΜΟΥ ΣΩΜΑΤΙΔΙΩΝ ΔΕΥΤΕΡΗΣ ΦΑΣΗΣ ΚΑΙ ΣΤΟ Β'ΜΕΡΟΣ ΟΙ… (more)

▼

ΣΤΗ ΔΙΔΑΚΤΟΡΙΚΗ ΑΥΤΗ ΕΡΓΑΣΙΑ ΕΞΕΤΑΖΟΝΤΑΙ ΣΤΟ Α'ΜΕΡΟΣ ΟΙ ΑΛΛΑΓΕΣ ΦΑΣΗΣ ΠΟΥ ΥΦΙΣΤΑΝΤΑΙ ΔΙΑΦΟΡΑ ΣΥΣΤΗΜΑΤΑ ΚΡΑΜΑΤΩΝ(A1-LI,A1-ZN,SI) ΜΕΣΩ ΤΟΥ ΣΧΗΜΑΤΙΣΜΟΥ ΣΩΜΑΤΙΔΙΩΝ ΔΕΥΤΕΡΗΣ ΦΑΣΗΣ ΚΑΙ ΣΤΟ Β'ΜΕΡΟΣ ΟΙ ΜΑΓΝΗΤΙΚΕΣ ΑΛΛΑΓΕΣ ΦΑΣΗΣ ΑΜΟΡΦΩΝ ΚΑΙ ΠΟΛΥΚΡΥΣΤΑΛΛΙΚΩΝ ΚΡΑΜΑΤΩΝ ΤΑ ΟΠΟΙΑ ΕΜΦΑΝΙΖΟΥΝ ΣΥΜΠΕΡΙΦΟΡΑ ΤΥΠΟΥ ΥΑΛΩΔΟΥΣ ΔΟΜΗΣ ΣΠΙΝ.Η ΠΕΙΡΑΜΑΤΙΚΗ ΜΕΘΟΔΟΣ ΠΟΥ ΧΡΗΣΙΜΟΠΟΙΕΙΤΑΙ ΕΙΝΑΙ Η ΣΚΕΔΑΣΗ ΝΕΤΡΟΝΙΩΝ ΣΕ ΜΙΚΡΕΣ ΓΩΝΙΕΣ(SANS) Η ΟΠΟΙΑ ΔΙΝΕΙ ΠΛΗΡΟΦΟΡΙΕΣ ΓΙΑ ΔΟΜΙΚΕΣ ΔΙΑΜΟΡΦΩΣΕΙΣ ΑΠΟ 1 ΕΩΣ 100ΝΜ,ΤΗΣ ΤΑΞΗΣ ΜΕΓΕΘΟΥΣ,ΔΗΛΑΔΗ,ΤΩΝ ΣΩΜΑΤΙΔΙΩΝ ΔΕΥΤΕΡΗΣ ΦΑΣΗΣ ΚΑΙ ΤΩΝ ΔΙΑΚΥΜΑΝΣΕΩΝ ΠΟΥ ΣΥΜΒΑΙΝΟΥΝ ΣΤΙΣ ΑΛΛΑΓΕΣ ΦΑΣΗΣ.ΑΝΑΠΤΥΣΣΕΤΑΙ ΜΙΑ ΘΕΩΡΙΑ ΒΑΘΜΩΣΗΣ ΤΩΝ ΠΑΡΑΜΕΤΡΩΝ ΚΑΙ ΚΑΜΠΥΛΩΝ ΣΚΕΔΑΣΗΣ ΟΙ ΟΠΟΙΕΣ ΕΚΦΡΑΖΟΝΤΑΙ ΣΕ ΜΟΡΦΗ ΠΑΓΚΟΣΜΙΩΝ ΣΥΝΑΡΤΗΣΕΩΝ.ΠΕΙΡΑΜΑΤΙΚΑ ΑΠΟΤΕΛΕΣΜΑΤΑ SANS ΑΠΟ ΔΥΟ ΤΕΛΕΙΩΣ ΔΙΑΦΟΡΕΤΙΚΑ ΣΥΣΤΗΜΑΤΑ,ΠΟΛΥΚΡΥΣΤΑΛΛΙΚΟ ΚΡΑΜΑ A1-ZN ΚΑΙ ΜΟΝΟΚΡΥΣΤΑΛΛΟ SI ΜΕ PPM ΠΡΟΣΜΙΞΕΙΣ ΟΞΥΓΟΝΟΥ,ΒΡΙΣΚΟΝΤΑΙ ΣΕ ΕΞΑΙΡΕΤΙΚΗ ΣΥΜΦΩΝΙΑ ΜΕ ΤΗΝ ΑΝΑΠΤΥΧΘΕΙΣΑ ΘΕΩΡΙΑ.Η ΘΕΩΡΙΑ SANS ΑΠΟ ΣΥΣΤΗΜΑ ΣΩΜΑΤΙΔΙΩΝ ΕΠΕΚΤΕΙΝΕΤΑΙ ΓΙΑ ΝΑ ΣΥΜΠΕΡΙΛΑΒΕΙ ΤΗΝ ΕΠΙΔΡΑΣΗ ΤΗΣ ΚΑΤΑΝΟΜΗΣ ΜΕΓΕΘΟΥΣ ΤΩΝ ΣΩΜΑΤΙΔΙΩΝ ΚΑΙ ΔΕΙΧΝΕΤΑΙ ΟΤΙ ΟΙ ΠΡΟΣΔΙΟΡΙΖΟΜΕΝΕΣ ΠΑΡΑΜΕΤΡΟΙ ΑΠΟ ΠΕΙΡΑΜΑΤΑ SANS ΜΠΟΡΕΙ ΝΑ ΕΚΦΡΑΣΤΟΥΝ ΣΥΝΑΡΤΗΣΕΙ ΤΩΝ ΡΟΠΩΝ ΤΗΣ ΕΚΑΣΤΟΤΕ ΚΑΤΑΝΟΜΗΣ.Η ΚΙΝΗΤΙΚΗ ΓΗΡΑΝΣΗΣ ΤΩΝ ΚΡΑΜΑΤΩΝ AI-LI ΕΞΕΤΑΖΕΤΑΙ ΜΕ ΔΥΝΑΜΙΚΑ ΚΑΙ ΣΤΑΤΙΚΑ ΠΕΙΡΑΜΑΤΑ SANS ΚΑΙ ΠΡΟΣΔΙΟΡΙΖΕΤΑΙ Η ΑΛΛΑΓΗ ΤΗΣ ΜΙΚΡΟΔΟΜΗΣ ΣΥΝΑΡΤΗΣΕΙ ΤΟΥ ΧΡΟΝΟΥ ΓΗΡΑΝΣΗΣ ΚΑΙ ΤΗΣ ΘΕΡΜΟΚΡΑΣΙΑΣ.ΔΕΙΧΝΕΤΑΙ,ΕΠΙΣΗΣ, ΜΕ ΠΕΙΡΑΜΑΤΑ ΔΙΑΛΥΣΗΣ ΣΕ ΥΨΗΛΕΣ ΘΕΡΜΟΚΡΑΣΙΕΣ ΟΤΙ ΤΟ ΜΕΓΕΘΟΣ ΤΩΝ ΣΩΜΑΤΙΔΙΩΝ ΜΠΟΡΕΙ ΝΑ ΠΡΟΒΛΕΦΘΕΙ ΠΟΛΥ ΚΑΛΑ ΒΑΣΕΙ ΤΩΝ ΠΡΟΣΔΙΟΡΙΣΘΕΙΣΩΝ ΣΤΑΘΕΡΩΝ ΚΙΝΗΤΙΚΗΣ.ΑΠΟ ΠΕΙΡΑΜΑΤΑ SANS ΣΤΑ ΑΜΟΡΦΑ ΚΡΑΜΑΤΑ FE100-XZRX ΚΑΙ ΣΤΟ ΠΟΛΥΚΡΥΣΤΑΛΛΙΚΟ ΚΡΑΜΑ FE70AI30 ΠΡΟΣΔΙΟΡΙΖΟΝΤΑΙ ΟΙ

IN PART A IS DISCUSSED THE DIFFUSIONAL PHASE TRANSFORMATIONS WHICH OCCUR IN VARIOUS ALLOY SYSTEMS(A1-LI,A1-ZN,SI) THROUGH THE FORMATION OF PRECIPITATES.IN PART B IS STUDIED THE MAGNETIC BEHAVIOUR OF AMORPHOUS(FE-ZR) AND POLYCRYSTALLINE(FE-A1) ALLOYS WHICH EXHIBIT SPIN-GLASS BEHAVIOUR.FOR THESE STUDIES SMALL ANGLE NEUTRON SCATTERING(SANS) IS USED WHICH GIVES INFORMATION FOR STRUCTURAL FLUCTUATIONS OF THE ORDER 1 TO 100NM WHICH IS THE RANGE OF THE SIZE OF THE PRECIPITATES AND THE EXTENT OF THE FLUCTUATIONS AT THE PHASE TRANSITIONS.IT HAS BEEN DEVELOPED A SCALING THEORY OF THE SANS CURVES AND OF THE DEDUCED PRECIPITATE PARAMETERS EXPRESSED AS UNIVERSAL FUNCTIONS.SANS RESULTS FROM TWO DIFFERENT SYSTEMS, POLYCRYSTALLINE A1-ZN ALLOY AND SI SINGLE CRYSTAL CONTAINING PPM OXYGEN,ARE IN EXCELLENT AGREEMENT WITH THIS SCALING THEORY.THE SANS THEORY FOR A SYSTEM OF PARTICLES IS EXTENDED IN ORDER TO INCLUDE SIZE DISTRIBUTIOM EFFECTS AND IT IS SHOWN THAT THE PARAMETERS DERIVED FROM SANS EXPERIMENTS CAN BE EXPRESSED AS FUNCTIONS OF THE MOMENTS OF THE SIZE DISTRIBUTION.THE KINETICS OF THE PHASE TRANSFORMATION OF A1-LI ALLOYS HAVE BEEN STUDIED BY IN SITU AND BY STATIC SANS EXPERIMENTS BY WHICH THE EVOLUTION OF THE MICROSTRUCTURE IS DETERMINED AS A FUNCTION OF AGEING TIME AND TEMPERATURE.IT IS SHOWN BY DISSOLUTION EXPERIMENTS AT HIGH TEMPERATURES THAT THE TEMPERATURE AND TIME DEPENDENT SIZE OF THE PRECIPITATES CAN BE…

Subjects/Keywords: Σκέδαση νετρονίων; Κράματα Al-li; Συσσωμάτωση; Αλλαγή φάσης; Υαλώδεις δομές σπιν; Άμορφα μαγνητικά συστήματα; Κράματα Fe-Zr; Κράματα Fe-Al; Neutron scattering; Precipitation; Coarsening; Al-Li alloys; Spin glasses; Fe-Zr amorphous alloys; Metallic glasses

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

APA (6^th Edition):

Μεργιά, �. (1997). Μελέτη αλλαγών φάσης με σκέδαση νετρονίων σε μικρές γωνίες. (Thesis). Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ); National and Kapodistrian University of Athens. Retrieved from http://hdl.handle.net/10442/hedi/12283

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):

Μεργιά, Κωνσταντία. “Μελέτη αλλαγών φάσης με σκέδαση νετρονίων σε μικρές γωνίες.” 1997. Thesis, Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ); National and Kapodistrian University of Athens. Accessed January 16, 2021. http://hdl.handle.net/10442/hedi/12283.

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

MLA Handbook (7^th Edition):

Μεργιά, Κωνσταντία. “Μελέτη αλλαγών φάσης με σκέδαση νετρονίων σε μικρές γωνίες.” 1997. Web. 16 Jan 2021.

Vancouver:

Μεργιά �. Μελέτη αλλαγών φάσης με σκέδαση νετρονίων σε μικρές γωνίες. [Internet] [Thesis]. Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ); National and Kapodistrian University of Athens; 1997. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/10442/hedi/12283.

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

Council of Science Editors:

Μεργιά �. Μελέτη αλλαγών φάσης με σκέδαση νετρονίων σε μικρές γωνίες. [Thesis]. Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ); National and Kapodistrian University of Athens; 1997. Available from: http://hdl.handle.net/10442/hedi/12283

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

25. Pal, Narendra K. Hydrogen Solubility and Permeability of Ni-Nb-Zr based Amorphous Alloy Membranes.

Degree: 2012, University of Nevada – Reno

URL: http://hdl.handle.net/11714/3624

► The demand of hydrogen, which is currently among the top industrial gases produced yearly in the world, will further increase due to the additional need… (more)

▼ The demand of hydrogen, which is currently among the top industrial gases produced yearly in the world, will further increase due to the additional need for upgrading the low-grade crude feedstock and our endeavor to bring hydrogen economy a reality in the twenty-first century.Hydrogen produced at cheaper price would be essential for realizing hydrogen economy in real sense on a sustainable basis. Hydrogen if produced from coal-gasification would be available at very cheap price at least for medium-term on sustainable basis as countries like USA, Australia etc have huge coal reserves which can last for hundreds years. For producing hydrogen from coal-gasification, we should have efficient, cost effective and robust purification membrane which can separate hydrogen from other gases like CO etc. Conventionally, Pd and Pd alloy membranes are being used for filtration of hydrogen from other mixed gases in coal-gasification produce. But high cost of Pd have forced scientific community to explore the possibility of using alternate to Pd as separation membrane and amorphous alloy membranes have edge over crystalline one as the former posses higher solubility and less chances of embrittlement in presence of hydrogen. Under similar conditions of temperature and pressure, some metallic glass alloys can absorb more hydrogen than their crystalline counterpart. This fact and the ductility of the amorphous alloys, suggests that they may be more promising than crystalline inter-metallic compounds as a medium for hydrogen storage. Under the present circumstances, Ni-Nb-Zr amorphous alloy membranes are considered to be prospective candidate for separation membranes as they posses' permeability close to Pd. Apart from better performance, these amorphous alloy membranes also provide considerable cost benefits compared to Pd and Pd-alloy based membranes. In this study, Ni-Nb-Zr based amorphous alloy membranes series of (Ni0.6Nb0.4)100-xZrx, (Ni0.6Nb0.3Ta0.1)100-xZrx and (Ni0.42Nb0.28Zr0.30)100-xBx were successfully fabricated and subsequently coated with thin layer of Pd on both sides. As permeation of hydrogen through membranes is governed by the hydrogen solubility and diffusion of the alloy membranes, I analyzed these amorphous alloy membranes for hydrogen solubility, permeability and durability. Hydrogen permeability of (Ni0.6Nb0.4)70Zr30 alloy membrane was found to be 2.2410-8 mol H m / m2 s Pa0.5 at 200OC, which is comparable with Pd and Pd alloy membranes. This alloy also gave the highest hydrogen solubility of 0.65 (H/M) at 200OC. Using pressure-concentration isotherms, the diffusion coefficients were calculated and (Ni0.6Nb0.4)70Zr30 amorphous alloy membrane gave highest diffusion coefficient of 4.9110-10 m2/s followed by (Ni0.6Nb0.3Ta0.1)70xZr30 amorphous alloy membrane which gave a value of 3.9910-10 m2/s for diffusion coefficient. It was found that Ta addition resulted in overall increase in durability but at the cost of permeation, that means there exists a trade-off between permeation and… Advisors/Committee Members: Chandra, Dhanesh (advisor), Li, Katherine (Qizhen) (committee member), Childress, Amy (committee member), Daemen, Jaak J.K. (committee member), Chien, Wen-Ming (committee member).

Subjects/Keywords: Amorphous; Coal; Hydrogen; Ni-Nb-Zr; Permeability; Solubility

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

APA (6^th Edition):

Pal, N. K. (2012). Hydrogen Solubility and Permeability of Ni-Nb-Zr based Amorphous Alloy Membranes. (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/3624

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):

Pal, Narendra K. “Hydrogen Solubility and Permeability of Ni-Nb-Zr based Amorphous Alloy Membranes.” 2012. Thesis, University of Nevada – Reno. Accessed January 16, 2021. http://hdl.handle.net/11714/3624.

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

MLA Handbook (7^th Edition):

Pal, Narendra K. “Hydrogen Solubility and Permeability of Ni-Nb-Zr based Amorphous Alloy Membranes.” 2012. Web. 16 Jan 2021.

Vancouver:

Pal NK. Hydrogen Solubility and Permeability of Ni-Nb-Zr based Amorphous Alloy Membranes. [Internet] [Thesis]. University of Nevada – Reno; 2012. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/11714/3624.

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

Council of Science Editors:

Pal NK. Hydrogen Solubility and Permeability of Ni-Nb-Zr based Amorphous Alloy Membranes. [Thesis]. University of Nevada – Reno; 2012. Available from: http://hdl.handle.net/11714/3624

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

Uppsala University

26. Ångström, Jonas. Hydrogen absorption/desorption properties of the Sc(AlxNi1-x)2 system.

Degree: Inorganic Chemistry, 2011, Uppsala University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159372

► Sc(Al_xNi_1-x)₂ is a pseudobinary C14 Laves phase and a potential interstitial hydrogen storage material or anode in a Ni-MH battery. A previous study showed… (more)

Subjects/Keywords: hydrogen storage; Laves phases; Ni-MH batteries; intermetallic compounds; alloy; alloys; Nickel; Hydrogen; Scandium; Sc; Ni; Aluminium; Aluminum; Al; Nickel metal hydride batteries; Laves phase; vätelagrning; Lavesfaser; Ni-MH batteri; intermetalliska föreningar; legering; legeringar; nickel; väte; skandium; aluminium; Lavesfas

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

APA (6^th Edition):

Ångström, J. (2011). Hydrogen absorption/desorption properties of the Sc(AlxNi1-x)2 system. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159372

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):

Ångström, Jonas. “Hydrogen absorption/desorption properties of the Sc(AlxNi1-x)2 system.” 2011. Thesis, Uppsala University. Accessed January 16, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159372.

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

MLA Handbook (7^th Edition):

Ångström, Jonas. “Hydrogen absorption/desorption properties of the Sc(AlxNi1-x)2 system.” 2011. Web. 16 Jan 2021.

Vancouver:

Ångström J. Hydrogen absorption/desorption properties of the Sc(AlxNi1-x)2 system. [Internet] [Thesis]. Uppsala University; 2011. [cited 2021 Jan 16]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159372.

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

Council of Science Editors:

Ångström J. Hydrogen absorption/desorption properties of the Sc(AlxNi1-x)2 system. [Thesis]. Uppsala University; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159372

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

Indian Institute of Science

27. Bhowmick, Ranadeep. Zr-based Bulk Metallic Glass A Study Of Processing, Welding And Subsurface Deformation Mechanism.

Degree: MSc Engg, Faculty of Engineering, 2011, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/1297

Subjects/Keywords: Metallic Glass; Zirconium Metallic Glass; Welding; Deformation; Bulk Metallic Glass (BMG); Welded Joints; Zr-Cu-Al-Ni; Glass Forming; Metallurgy

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

APA (6^th Edition):

Bhowmick, R. (2011). Zr-based Bulk Metallic Glass A Study Of Processing, Welding And Subsurface Deformation Mechanism. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/1297

Chicago Manual of Style (16^th Edition):

Bhowmick, Ranadeep. “Zr-based Bulk Metallic Glass A Study Of Processing, Welding And Subsurface Deformation Mechanism.” 2011. Masters Thesis, Indian Institute of Science. Accessed January 16, 2021. http://etd.iisc.ac.in/handle/2005/1297.

MLA Handbook (7^th Edition):

Bhowmick, Ranadeep. “Zr-based Bulk Metallic Glass A Study Of Processing, Welding And Subsurface Deformation Mechanism.” 2011. Web. 16 Jan 2021.

Vancouver:

Bhowmick R. Zr-based Bulk Metallic Glass A Study Of Processing, Welding And Subsurface Deformation Mechanism. [Internet] [Masters thesis]. Indian Institute of Science; 2011. [cited 2021 Jan 16]. Available from: http://etd.iisc.ac.in/handle/2005/1297.

Council of Science Editors:

Bhowmick R. Zr-based Bulk Metallic Glass A Study Of Processing, Welding And Subsurface Deformation Mechanism. [Masters Thesis]. Indian Institute of Science; 2011. Available from: http://etd.iisc.ac.in/handle/2005/1297

Universidade Federal de Sergipe

28. Augusto dos Santos Freitas. APLICAÇÃO DE CAMPO EFETIVO E DA TÉCNICA DE MONTE CARLO AO ESTUDO DE LIGAS FE-AL.

Degree: 2012, Universidade Federal de Sergipe

URL: http://bdtd.ufs.br/tde_busca/arquivo.php?codArquivo=880

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Neste trabalho, aplicamos o modelo de Ising com diluição por sítios ao estudo das propriedades magnéticas de uma rede cúbica de corpo centrado (do inglês,… (more)

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Neste trabalho, aplicamos o modelo de Ising com diluição por sítios ao estudo das propriedades magnéticas de uma rede cúbica de corpo centrado (do inglês, body centered cubic, bcc), cujos sítios podem ser ocupados por spins. Como aplicação desse estudo, traçamos alguns diagramas de fase da liga Fe-Al, com comparações entre o modelo teórico utilizado e dados experimentais e propomos uma interação de troca entre os atomos de Fe, na liga, com dependência ate terceira potência da concentração (q) de atomos de Al, possibilitando um melhor ajuste entre teoria e experimento para o diagrama T-q desta liga. Tomamos como base a tecnica do operador diferencial para expandir as expressoes analıticas que surgem do modelo de Ising diluıdo e descrevemos tal comportamento magnetico por meio de aglomerados com 1 e 2 spins. Um bom acordo entre o modelo teorico proposto e dados experimentais tambem e obtido tanto para a magnetização como função de q quanto para o parametro de rede, r, como função de q, sendo que esta abordagem mostra-se como uma boa alternativa a outras tecnicas analıticas e computacionais utilizadas para o estudo de sistemas magneticos diluıdos. Os resultados analıticos obtidos para a rede bcc foram comparados com a tecnica de Monte Carlo para verificar o grau de aplicabilidade do modelo bem como confirmar a validade dos resultados encontrados analiticamente.

In the present work, we study the magnetic properties in the site diluted two-state Ising model on a body-centered cubic lattice. As an application of this study, we has been obtained the phase diagram for Fe-Al alloys and comparisons between theoretical model and experimental data are made by using the exchange interaction between Fe atoms in the alloy up to the third power dependence on concentration q of Al atoms. We have used the differential operator technique to expand the analytical expressions that arise from the diluted Ising model and describe such behavior by means of magnetic clusters with one and two spins. A good agreement between the theoretical model and experimental data is also obtained for both the magnetization and to the lattice parameter, r as a function of q. In this approach, it is shown as a good alternative to other analytical and computational techniques used for the study of diluted magnetic systems. The analytical results obtained for bcc lattice were compared with the Monte Carlo technique to determine the degree of applicability of the model and confirm the validity of the results obtained analytically.

Advisors/Committee Members: Douglas Ferreira de Albuquerque.

Subjects/Keywords: Ligas Fe-Al; FISICA; Fe-Al alloys

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

APA (6^th Edition):

Freitas, A. d. S. (2012). APLICAÇÃO DE CAMPO EFETIVO E DA TÉCNICA DE MONTE CARLO AO ESTUDO DE LIGAS FE-AL. (Thesis). Universidade Federal de Sergipe. Retrieved from http://bdtd.ufs.br/tde_busca/arquivo.php?codArquivo=880

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):

Freitas, Augusto dos Santos. “APLICAÇÃO DE CAMPO EFETIVO E DA TÉCNICA DE MONTE CARLO AO ESTUDO DE LIGAS FE-AL.” 2012. Thesis, Universidade Federal de Sergipe. Accessed January 16, 2021. http://bdtd.ufs.br/tde_busca/arquivo.php?codArquivo=880.

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

MLA Handbook (7^th Edition):

Freitas, Augusto dos Santos. “APLICAÇÃO DE CAMPO EFETIVO E DA TÉCNICA DE MONTE CARLO AO ESTUDO DE LIGAS FE-AL.” 2012. Web. 16 Jan 2021.

Vancouver:

Freitas AdS. APLICAÇÃO DE CAMPO EFETIVO E DA TÉCNICA DE MONTE CARLO AO ESTUDO DE LIGAS FE-AL. [Internet] [Thesis]. Universidade Federal de Sergipe; 2012. [cited 2021 Jan 16]. Available from: http://bdtd.ufs.br/tde_busca/arquivo.php?codArquivo=880.

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

Council of Science Editors:

Freitas AdS. APLICAÇÃO DE CAMPO EFETIVO E DA TÉCNICA DE MONTE CARLO AO ESTUDO DE LIGAS FE-AL. [Thesis]. Universidade Federal de Sergipe; 2012. Available from: http://bdtd.ufs.br/tde_busca/arquivo.php?codArquivo=880

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

29. Achuthankutty, Ajith. Deposition Kinetics of Titanium and Zirconium Diffusion Coatings on Nickel Microwires via Pack Cementation.

Degree: MS, Engineering and Applied Science: Materials Science, 2020, University of Cincinnati

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1592133155467387

► Pack cementation is a promising technique to synthesize hollow NiTi microtubes, which impart enhanced heating/cooling efficiency and, thus, faster shape memory response. Prior research investigating… (more)

▼ Pack cementation is a promising technique to synthesize hollow NiTi microtubes, which impart enhanced heating/cooling efficiency and, thus, faster shape memory response. Prior research investigating the effect of wire size on phase evolution and Kirkendall pore formation during pack titanization showed a significant difference between large (100 µm) and small (25 µm) diameter wires. The first objective of this research is to quantify the titanium deposition kinetics on intermediate-sized Ni wire (75 µm diameter) and determine the required coating time to achieve the desired near-equiatomic NiTi composition. It also explores an ex-situ study of the formation of a dual-pore structure that forms in some of the wires and provides insight for future in-situ investigations of the wire size effect on pack titanizing.Even though binary NiTi shape memory alloys offer excellent biocompatibility, strength, and corrosion resistance, their application is limited to less than 100 ºC. Hence, there is a need to increase the transformation temperatures for high-temperature applications, especially for aerospace applications. Certain ternary alloying additions to NiTi form high temperature shape memory alloys (HTSMAs) as there is an associated increase in the austenite-martensite transformation temperature and, therefore, have attracted considerable attention from researchers. Ni-Ti-Zr is one such HTSMA that provides the additional advantages of weight and cost reduction as compared to its platinum (Pt), gold (Au) and hafnium (Hf) counterparts. In the current research, attempts were made to produce Ni-Ti-Zr wires by co-depositing Ti and Zr on Ni wires using a halide activated pack in a single step process. The samples gained Zr content, but not enough was deposited to increase the transformation temperature. Moreover, a significant variation in the coating thickness was observed, resulting in a significant fluctuation in the composition.Therefore, as a first step, deposition of Zr on Ni wires was conducted to assess the feasibility of a two-step coating process to achieve the desired ternary Ni-Ti-Zr composition. The deposition kinetics, intermetallic phases formed, coating thicknesses, and composition were determined at 925 °C for various coating durations. The samples reached approximately 12-13 at. % Zr after 3 hours of coating. The as-coated wires, upon characterization via optical and laser microscopy, SEM, and EDX, displayed a core-shell structure with intermetallic phases which appeared to be Ni7Zr2 and Ni3Zr around the Ni core demonstrating the feasibility of the deposition process. The outcome of the present study will provide insight to further research regarding fabrication of these HTSMA microtubes, which can be utilized in the automotive, aerospace, and oil industries. Advisors/Committee Members: Paz y Puente, Ashley (Committee Chair).

Subjects/Keywords: Materials Science; Shape Memory Alloys; Kirkendall Effect; Ni-Ti-Zr; Pack Cementation; High Temperature Shape Memory Alloys; Microwires

…of Hf additions to NiTi, but Ni-Ti-Zr alloys have not been extensively studied. However, Ni… …Ti-Zr alloys provide a tremendous reduction in weight compared to their Ni-Ti-Hf… …55 Figure 39. Homogenized for 24 h after 120 min coating using 10 wt.% Ni-Zr pre-alloyed… …57 Figure 41. BSE micrographs for Ni wires co-deposited with Ti and Zr ( 20 wt. % Zr… …showing the diffusion of Zr in Ni at 925 °C…

10 more images…

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

APA (6^th Edition):

Achuthankutty, A. (2020). Deposition Kinetics of Titanium and Zirconium Diffusion Coatings on Nickel Microwires via Pack Cementation. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1592133155467387

Chicago Manual of Style (16^th Edition):

Achuthankutty, Ajith. “Deposition Kinetics of Titanium and Zirconium Diffusion Coatings on Nickel Microwires via Pack Cementation.” 2020. Masters Thesis, University of Cincinnati. Accessed January 16, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1592133155467387.

MLA Handbook (7^th Edition):

Achuthankutty, Ajith. “Deposition Kinetics of Titanium and Zirconium Diffusion Coatings on Nickel Microwires via Pack Cementation.” 2020. Web. 16 Jan 2021.

Vancouver:

Achuthankutty A. Deposition Kinetics of Titanium and Zirconium Diffusion Coatings on Nickel Microwires via Pack Cementation. [Internet] [Masters thesis]. University of Cincinnati; 2020. [cited 2021 Jan 16]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1592133155467387.

Council of Science Editors:

Achuthankutty A. Deposition Kinetics of Titanium and Zirconium Diffusion Coatings on Nickel Microwires via Pack Cementation. [Masters Thesis]. University of Cincinnati; 2020. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1592133155467387

Brno University of Technology

30. Novotný, David. Vliv přetavení elektronovým paprskem na binární směsi deponované metodou cold spray: Effect of electron beam remeltin on binary mixtures deposited by the cold spray method.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/82343

► This bachelor’s thesis deals with the effect of an electron beam remelting on binary mixtures of Fe-Al and Ni-Al, which were deposited by Cold spray.… (more)

Subjects/Keywords: Intermetalické sloučeniny; Fe-Al; Ni-Al; elektronový paprsek; Cold spray; Intermetallic compounds; Fe-Al; Ni-Al; electron beam; Cold spray

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

APA (6^th Edition):

Novotný, D. (2019). Vliv přetavení elektronovým paprskem na binární směsi deponované metodou cold spray: Effect of electron beam remeltin on binary mixtures deposited by the cold spray method. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/82343

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):

Novotný, David. “Vliv přetavení elektronovým paprskem na binární směsi deponované metodou cold spray: Effect of electron beam remeltin on binary mixtures deposited by the cold spray method.” 2019. Thesis, Brno University of Technology. Accessed January 16, 2021. http://hdl.handle.net/11012/82343.

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

MLA Handbook (7^th Edition):

Novotný, David. “Vliv přetavení elektronovým paprskem na binární směsi deponované metodou cold spray: Effect of electron beam remeltin on binary mixtures deposited by the cold spray method.” 2019. Web. 16 Jan 2021.

Vancouver:

Novotný D. Vliv přetavení elektronovým paprskem na binární směsi deponované metodou cold spray: Effect of electron beam remeltin on binary mixtures deposited by the cold spray method. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/11012/82343.

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

Council of Science Editors:

Novotný D. Vliv přetavení elektronovým paprskem na binární směsi deponované metodou cold spray: Effect of electron beam remeltin on binary mixtures deposited by the cold spray method. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/82343

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

Open Access Theses and Dissertations