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Ryerson University
1.
Jafar-Salehi, Elham.
Compaction density variation in powder metallurgy components.
Degree: 2010, Ryerson University
URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A1731 
► The main objective of this research was to study the relationship between green density and compaction pressure in powdered metallurgy. Powder metallurgy has gained popularity…
(more)
▼ The main objective of this research was to study the relationship between green density and compaction pressure in powdered
metallurgy.
Powder metallurgy has gained popularity and importance because of its near net shape, cost effectiveness and its ability to reduce the complexity of multileveled engineering components. However,
powder metallurgy poses challenges that are yet to be fully understood. There are many works performed to address challenges such as the effect of friction, the tool kinematics, handling component prior to sintering and fracture under compaction.This work concentrates on the relationship between green density distribution and compaction pressure. In order to measure the relative density of compacted components, Electron Scanning Microscope was utilized. One can intuitively conceive that the relative density requires more than intuition. It was determined that highest relative density occurs at the center of the specimen and reduces toward the die-
powder or punch-
powder boundary. For completeness, the application of artificial neural network (ANN) and finite element (FE) model in estimation of green relative density was studied. The results of this research signify that ANN is an excellent technique to determine the relative density distribution of un-sintered compacted specimen. Moreover, finite element method can accurately estimate the average relative density of compacted specimen.
Advisors/Committee Members: Ghasempoor, A (Thesis advisor).
Subjects/Keywords: Powder metallurgy
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APA (6th Edition):
Jafar-Salehi, E. (2010). Compaction density variation in powder metallurgy components. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A1731
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jafar-Salehi, Elham. “Compaction density variation in powder metallurgy components.” 2010. Thesis, Ryerson University. Accessed March 19, 2019.
https://digital.library.ryerson.ca/islandora/object/RULA%3A1731.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jafar-Salehi, Elham. “Compaction density variation in powder metallurgy components.” 2010. Web. 19 Mar 2019.
Vancouver:
Jafar-Salehi E. Compaction density variation in powder metallurgy components. [Internet] [Thesis]. Ryerson University; 2010. [cited 2019 Mar 19].
Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1731.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jafar-Salehi E. Compaction density variation in powder metallurgy components. [Thesis]. Ryerson University; 2010. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1731
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
2.
Karamchedu, Seshendra.
Effect of diffusion bonded Cu and Ni on sinter hardening response of Mo prealloyed PM steel.
Degree: 2010, Chalmers University of Technology
URL: http://studentarbeten.chalmers.se/publication/130395-effect-of-diffusion-bonded-cu-and-ni-on-sinter-hardening-response-of-mo-prealloyed-pm-steel
► Through utilization of hardenable powder in combination with accelerated post sintering cooling rates, sinter hardening offers good manufacturing economy as well as unique combination of…
(more)
▼ Through utilization of hardenable powder in combination with accelerated post sintering cooling rates, sinter hardening offers good manufacturing economy as well as unique combination of mechanical properties. In order to obtain desired mechanical properties, the microstructure can be manipulated to form the required amount of martensite and bainite using suitable alloying system.
The aim of the current study is to outline the sinter hardening response of Astaloy Mo based PM steels. For this purpose and to elucidate the effect of the alloying, together with Astaloy Mo (prealloyed with 1.5% Mo), Distaloy DH (diffusion bonded with 2 wt. % Cu) and Distaloy DC (diffusion bonded with 2 wt. % Ni) were examined.
For each alloy tensile samples were manufactured by sintering at 1120°C for 30 minutes and cooling at a rate of 2.5 °C/s (within 800 to 300 °C). Afterwards, the tensile specimens were subjected to a tempering treatment at 200 °C for 60 minutes. Distaloy DH and Distaloy DC with two different levels of admixed graphite content (i.e. 0.55 and 0.7 wt. %), and Astaloy Mo admixed with 0.55 wt. %C have been investigated for tensile properties, hardness, microhardness, porosity and residual stresses. Metallographic examination using optical microscopy along with scanning electron microscopy (SEM) combined with energy dispersive X-ray analysis (EDX) has been performed in an attempt to relate the results obtained from the mechanical testing to the microstructure of the alloys.
Regarding tensile properties, Distaloy DH was seen to be slightly better than Distaloy DC while Astaloy Mo possessed the lowest values. Increase in graphite content did not contribute to a significant increase in tensile strength; however, it resulted in a decrease in elongation for both Distaloy DC and Distaloy DH. These findings were related to the fully bainitic microstructure of Astaloy Mo as compared to a bainitic-martensitic microstructure of Distaloy materials. A correlation between the microhardness and the effect of distribution of alloying elements has been proposed, with which the microstructure development can be explained. Regarding surface residual stresses, Astaloy Mo had a compressive surface stress state, while for the other materials it was tensile but with very low values. For all the materials analyzed, porosity analysis revealed that, for a particular size range or pores their shape was similar.
In conclusion, the investigation presents a comparative study on the effect of addition of 2 wt. % Cu and Ni (to Astaloy Mo) on the microstructure and the resulting influence on the final mechanical properties.
Subjects/Keywords: Sinter hardening; Powder Metallurgy
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APA (6th Edition):
Karamchedu, S. (2010). Effect of diffusion bonded Cu and Ni on sinter hardening response of Mo prealloyed PM steel. (Thesis). Chalmers University of Technology. Retrieved from http://studentarbeten.chalmers.se/publication/130395-effect-of-diffusion-bonded-cu-and-ni-on-sinter-hardening-response-of-mo-prealloyed-pm-steel
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Karamchedu, Seshendra. “Effect of diffusion bonded Cu and Ni on sinter hardening response of Mo prealloyed PM steel.” 2010. Thesis, Chalmers University of Technology. Accessed March 19, 2019.
http://studentarbeten.chalmers.se/publication/130395-effect-of-diffusion-bonded-cu-and-ni-on-sinter-hardening-response-of-mo-prealloyed-pm-steel.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Karamchedu, Seshendra. “Effect of diffusion bonded Cu and Ni on sinter hardening response of Mo prealloyed PM steel.” 2010. Web. 19 Mar 2019.
Vancouver:
Karamchedu S. Effect of diffusion bonded Cu and Ni on sinter hardening response of Mo prealloyed PM steel. [Internet] [Thesis]. Chalmers University of Technology; 2010. [cited 2019 Mar 19].
Available from: http://studentarbeten.chalmers.se/publication/130395-effect-of-diffusion-bonded-cu-and-ni-on-sinter-hardening-response-of-mo-prealloyed-pm-steel.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Karamchedu S. Effect of diffusion bonded Cu and Ni on sinter hardening response of Mo prealloyed PM steel. [Thesis]. Chalmers University of Technology; 2010. Available from: http://studentarbeten.chalmers.se/publication/130395-effect-of-diffusion-bonded-cu-and-ni-on-sinter-hardening-response-of-mo-prealloyed-pm-steel
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Dalhousie University
3.
Selig, Stanley.
Finite Element Simulation of the Compaction and Springback
of an Aluminum Powder Metallurgy Alloy.
Degree: Master of Applied Science, Department of Mechanical Engineering, 2012, Dalhousie University
URL: http://hdl.handle.net/10222/14615
► A new finite element model was developed to predict the density distribution in an Alumix 321 powder metallurgy compact. The model can predict the density…
(more)
▼ A new finite element model was developed to predict
the density distribution in an Alumix 321
powder metallurgy
compact. The model can predict the density distribution results of
single-action compaction from 100 to 500 MPa compaction pressure.
The model can also determine the amount of springback experienced
by a compact upon ejection from the die at 100 and 300 MPa
compaction pressure. An optical densitometry method, along with the
creation of a compaction curve, was used to experimentally predict
density distributions found within compacts, and found results that
were consistent with both literature and finite element simulation.
Further
powder characterization included testing apparent density
and flow rate of the
powder. A literature review was also conducted
and the results of which have been organized by three categories
(
powder type, material model, and finite element code) for easy
reference by future
powder researchers.
Advisors/Committee Members: Dr. Marek Kujath (graduate-coordinator), Dr. Ted Hubbard (thesis-reader), Dr. Paul Bishop (thesis-reader), Dr. Darrel Doman (thesis-supervisor), Not Applicable (ethics-approval), Not Applicable (manuscripts), Not Applicable (copyright-release).
Subjects/Keywords: Finite element simulation; Powder metallurgy
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APA ·
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Manager
APA (6th Edition):
Selig, S. (2012). Finite Element Simulation of the Compaction and Springback
of an Aluminum Powder Metallurgy Alloy. (Masters Thesis). Dalhousie University. Retrieved from http://hdl.handle.net/10222/14615
Chicago Manual of Style (16th Edition):
Selig, Stanley. “Finite Element Simulation of the Compaction and Springback
of an Aluminum Powder Metallurgy Alloy.” 2012. Masters Thesis, Dalhousie University. Accessed March 19, 2019.
http://hdl.handle.net/10222/14615.
MLA Handbook (7th Edition):
Selig, Stanley. “Finite Element Simulation of the Compaction and Springback
of an Aluminum Powder Metallurgy Alloy.” 2012. Web. 19 Mar 2019.
Vancouver:
Selig S. Finite Element Simulation of the Compaction and Springback
of an Aluminum Powder Metallurgy Alloy. [Internet] [Masters thesis]. Dalhousie University; 2012. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/10222/14615.
Council of Science Editors:
Selig S. Finite Element Simulation of the Compaction and Springback
of an Aluminum Powder Metallurgy Alloy. [Masters Thesis]. Dalhousie University; 2012. Available from: http://hdl.handle.net/10222/14615
Dalhousie University
4.
Murray, Donald Clark.
On Improving The Oxidation Resistance Of A Nickel-Based
Superalloy Produced By Powder Metallurgy.
Degree: Master of Applied Science, Department of Process Engineering and Applied
Science, 2012, Dalhousie University
URL: http://hdl.handle.net/10222/15246
► Nickel-based Superalloys are widely used in the steam turbine power generation and aerospace industries. They possess the desirable qualities of high-temperature strength, oxidation and corrosion…
(more)
▼ Nickel-based Superalloys are widely used in the steam
turbine power generation and aerospace industries. They possess the
desirable qualities of high-temperature strength, oxidation and
corrosion resistance and can operate in some of the highest
temperature ranges of the structural metals. The oxidation
resistance of a Superalloy is achieved primarily through the
formation of a dense alumina and/or chromia oxide layer(s)
including spinels. This resistance has been further improved in
wrought and cast alloys through the addition of reactive elements
such as silicon, yttrium and lanthanum, although the exact effects
of these elements have not been well defined. This project
concentrated on a
powder metallurgy ternary master alloy consisting
of Ni-12Cr-9Fe (w/o) with additions of 6w/o aluminum, 0.5w/o Si,
and 0.1w/o Y, in various combinations. Specifically, the primary
goal was to produce and characterize a PM manufactured nickel-based
Superalloy with minor additions of reactive elements and to assess
the effectiveness of the Si and/or Y in improving the oxidation
resistance. JMatPro modeling software was first used to help
determine temperatures at which various events would occur in the
alloys such as solutionizing and liquation temperatures.
Subsequently green compacts were produced by a press (uni-axially)
and sinter route to create transverse rupture strength bars (TRS
bars). These bars were then thermomechanically deformed using a
Gleeble tester to reduce porosity followed by a heat treatment to
restore a microstructure better suited for high temperature
oxidation. Sectioned TRS bars were then oxidized (static) 900?C in
air for times up to 1000h and the influence of the Si/Y additions
on oxidation resistance was determined via a combination of weight
gain data and microstructural examination. Whereas JMatPro
predicted solutionizing temperature of the compositions studied
(1010°C quaternary; 1020°C quaternary + Si, respectively) these
values were slightly lower than the results observed through DSC
experiments (1045°C quaternary; 1065°C quaternary + Si,
respectively). A w/o ?’ of approximately 25% was predicted by the
modeling tool, but values of 58.3% to 61.7% were determined using a
point count method. Finally, the addition of 0.5w/o Si to the
quaternary Ni-Cr-Fe-Al PM system provided a measureable improvement
in the oxidation resistance both in terms of thickness of oxide
layer and in overall weight gain. Conversely, 0.1w/o Y provided
little benefit, and was shown to be detrimental to alloys not
containing Si.
Advisors/Committee Members: Dr. S. Corbin (external-examiner), Dr. M. J. Pegg (graduate-coordinator), Dr. S. Corbin (thesis-reader), Dr. N. L. Richards, Dr. W. F. Caley, Dr. G. J. Kipouros (thesis-supervisor), Not Applicable (ethics-approval), Not Applicable (manuscripts), Yes (copyright-release).
Subjects/Keywords: Superalloys; Powder Metallurgy; Oxidation
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APA ·
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Manager
APA (6th Edition):
Murray, D. C. (2012). On Improving The Oxidation Resistance Of A Nickel-Based
Superalloy Produced By Powder Metallurgy. (Masters Thesis). Dalhousie University. Retrieved from http://hdl.handle.net/10222/15246
Chicago Manual of Style (16th Edition):
Murray, Donald Clark. “On Improving The Oxidation Resistance Of A Nickel-Based
Superalloy Produced By Powder Metallurgy.” 2012. Masters Thesis, Dalhousie University. Accessed March 19, 2019.
http://hdl.handle.net/10222/15246.
MLA Handbook (7th Edition):
Murray, Donald Clark. “On Improving The Oxidation Resistance Of A Nickel-Based
Superalloy Produced By Powder Metallurgy.” 2012. Web. 19 Mar 2019.
Vancouver:
Murray DC. On Improving The Oxidation Resistance Of A Nickel-Based
Superalloy Produced By Powder Metallurgy. [Internet] [Masters thesis]. Dalhousie University; 2012. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/10222/15246.
Council of Science Editors:
Murray DC. On Improving The Oxidation Resistance Of A Nickel-Based
Superalloy Produced By Powder Metallurgy. [Masters Thesis]. Dalhousie University; 2012. Available from: http://hdl.handle.net/10222/15246
Dublin City University
5.
Sajjia, Mustafa.
Cobalt ferrite prepared employing powder technology, the potential applications, the preparation and characterisation.
Degree: School of Mechanical and Manufacturing Engineering, 2013, Dublin City University
URL: http://doras.dcu.ie/19055/
► The phenomenon of magnetostriction takes place where there is a change in dimensions that spontaneously occurs in ferromagnetic and ferrimagnetic materials when an external magnetic…
(more)
▼ The phenomenon of magnetostriction takes place where there is a change in dimensions that spontaneously occurs in ferromagnetic and ferrimagnetic materials when an external magnetic field is applied. Cobalt ferrite, being a ferromagnetic material, has been proposed as a suitable magnetostrictive material for some applications in the area of sensors and actuators. In such applications, speed of response with accurate displacements is important. Although cobalt ferrite has been shown to have a small magnetostrictive coefficient, which is a disadvantage, it also has a very small hysteresis characteristic. It follows that the results of using this material should be a smaller amount of energy loss and higher accuracy at high frequencies, and these benefits may outweigh this disadvantage. In this thesis, making cobalt ferrite
powder with nano sized particles is suggested as a first step in a solution to overcoming the disadvantage mentioned above, if the particles are small enough to have only one magnetic domain. Powders were prepared employing the sol–gel technique. A particular emphasis is devoted to an understanding of the role of the chemical parameters involved in the sol–gel technique, and of the effect of the heat treatment on the structures and morphologies of the powders obtained. These were investigated by varying the initial parameters of the experiment in addition to the heat treatment temperature. The magnetic characteristics of the optimum nanoparticles were measured. The heat treatment process was simulated and optimised by means of DoE. The optimal heat treatment conditions, which facilitate the attainment of cobalt ferrite nanoparticles under low electrical operating costs, were defined. Nanoparticles obtained employing the optimal solution were uniaxially pressed to form standard disc samples, and sintered under continuous ramp rate and single dwell time conditions. A study of the
powder behaviour during this process, the density variation with pressing applied pressure, sintering temperature and dwell time, was conducted.
Advisors/Committee Members: Olabi, Abdul-Ghani.
Subjects/Keywords: Materials; Mechanical engineering; Powder Metallurgy
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APA ·
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APA (6th Edition):
Sajjia, M. (2013). Cobalt ferrite prepared employing powder technology, the potential applications, the preparation and characterisation. (Thesis). Dublin City University. Retrieved from http://doras.dcu.ie/19055/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sajjia, Mustafa. “Cobalt ferrite prepared employing powder technology, the potential applications, the preparation and characterisation.” 2013. Thesis, Dublin City University. Accessed March 19, 2019.
http://doras.dcu.ie/19055/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sajjia, Mustafa. “Cobalt ferrite prepared employing powder technology, the potential applications, the preparation and characterisation.” 2013. Web. 19 Mar 2019.
Vancouver:
Sajjia M. Cobalt ferrite prepared employing powder technology, the potential applications, the preparation and characterisation. [Internet] [Thesis]. Dublin City University; 2013. [cited 2019 Mar 19].
Available from: http://doras.dcu.ie/19055/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sajjia M. Cobalt ferrite prepared employing powder technology, the potential applications, the preparation and characterisation. [Thesis]. Dublin City University; 2013. Available from: http://doras.dcu.ie/19055/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of British Columbia
6.
Rao, A. Sadananda.
Theories of hot-pressing : plastic flow contribution
.
Degree: 1971, University of British Columbia
URL: http://hdl.handle.net/2429/34361
► The contribution of plastic flow to overall densification of a powder compact during hot-pressing has been analysed. The basis of this analysis is the incorporation…
(more)
▼ The contribution of plastic flow to overall densification of a powder compact during hot-pressing has been analysed. The basis of this analysis is the incorporation of hot-working characteristics of materials at elevated temperatures into an equation applicable to hot-pressing conditions. The empirical equation relating steady state
strain rate to stress is ἐ = Aσn and for the densification of a
powder compact, the strain rate [formula omitted]
The particles are assumed to be spheres and four different packing geometric configurations: cubic, orthorhombic, rhombic dodecahedron and b.c.c. are considered. Taking into consideration the effective stress acting at the points of contact, the equations for the strain rate can be combined and arranged into another equation which is shown below:[formula omitted]
where α₁ and ϐ are geometric constants and can be calculated from the
packing geometry. 'A' and 'n' are material constants. D is the relative
density of the compact, and ‘R’ is the radius of sphere at any stage of
deformation in arbitrary units.
Computerized plots of D vs t were obtained for lead-2% antimony,
nickel and alumina. Experimental verification of these plots was carried
out using hot-pressing data for lead-2% antimony, nickel and alumina
spheres. The hot-compaction experiments were carried out over a range
of temperatures for each material and under different pressures.
The experimental data fitted well with the theoretical prediction
for the orthorhombic model. However, a deviation at the initial stage
of compaction was encountered in most cases. This deviation was
explained on the basis of the contribution to densification by
particle movement or rearrangement at the initial stage, which could
not be taken into account in the theoretical derivation.
The stress concentration factor i.e., the effective stress acting at necks between particles has been calculated. This was found to be
very much higher than that previously used by other workers. The
theoretical equation for the effective stress is [formula omitted].
This equation predicts an effective stress, which is more than an order of magnitude higher than that predicted by several empirical equations used previously.
Subjects/Keywords: Powder metallurgy
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APA ·
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Export
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Manager
APA (6th Edition):
Rao, A. S. (1971). Theories of hot-pressing : plastic flow contribution
. (Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/34361
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rao, A Sadananda. “Theories of hot-pressing : plastic flow contribution
.” 1971. Thesis, University of British Columbia. Accessed March 19, 2019.
http://hdl.handle.net/2429/34361.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rao, A Sadananda. “Theories of hot-pressing : plastic flow contribution
.” 1971. Web. 19 Mar 2019.
Vancouver:
Rao AS. Theories of hot-pressing : plastic flow contribution
. [Internet] [Thesis]. University of British Columbia; 1971. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/2429/34361.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rao AS. Theories of hot-pressing : plastic flow contribution
. [Thesis]. University of British Columbia; 1971. Available from: http://hdl.handle.net/2429/34361
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waikato
7.
Alshammari, Yousef Namlan.
Production and characterization of titanium based alloys with potential for antifouling and biofouling
.
Degree: 2017, University of Waikato
URL: http://hdl.handle.net/10289/12052
► Biofouling is the settlement and accumulation of microorganisms on the surface of a material submerged in sea water, and most of the time is an…
(more)
▼ Biofouling is the settlement and accumulation of microorganisms on the surface of a material submerged in sea water, and most of the time is an unwanted phenomenon and constitutes a financial burden. Titanium is a lightweight high strength metal characterised by good corrosion resistance, better than stainless steel, and would be the ideal material to be used in marine applications. However, biofouling would still happen in structures made out of titanium.
The aim of this study is to gain understanding of the biofouling process to be able to design Ti-based materials with the potential to prevent, or conversely enhance, biofouling, as both scenarios could have relevant industrial applications. In particular, it was planned to manufacture the Ti-based materials via
powder metallurgy to take advantage of the intrinsic benefits of these techniques which include the freedom of designing new alloys, without the limits imposed by binary phase diagrams.
From literature, it was found that Cu and Mn could have respectively, the ability to reduce or promote biofouling. Therefore, various binary Ti-xCu and Ti-yMn compositions, where x = 0.5%, 2.5%, 5%, and y = 1%, 5%, 10%, were targeted and successfully manufactured via the conventional
powder metallurgy route of cold uniaxial pressing plus vacuum sintering, obtaining fully homogeneous materials.
It is well known that residual porosity is still present in sintered Ti-based materials, and for that the binary Ti-xCu and Ti-yMn alloys were also a thermomechanical process via forging. This hot deformation process should reduce the amount of residual porosity, but it can also be used to tailor the microstructure, and thus the mechanical behaviour, which is paramount for many industrial applications. Along this line, it was decided to investigate the effect of the forging temperature (i.e. of the starting microfeatures) and thus forging from the β and within the α+β region was considered.
From the characterisation performed, the Ti-5Cu and Ti-5Mn alloys were chosen as the most promising alloys for the investigation of the antifouling and biofouling capability of the binary Ti-xCu and Ti-yMn alloys developed
Advisors/Committee Members: Bolzoni, Leandro (advisor).
Subjects/Keywords: Titanium;
Powder metallurgy;
antifouling;
biofouling
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APA ·
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Manager
APA (6th Edition):
Alshammari, Y. N. (2017). Production and characterization of titanium based alloys with potential for antifouling and biofouling
. (Masters Thesis). University of Waikato. Retrieved from http://hdl.handle.net/10289/12052
Chicago Manual of Style (16th Edition):
Alshammari, Yousef Namlan. “Production and characterization of titanium based alloys with potential for antifouling and biofouling
.” 2017. Masters Thesis, University of Waikato. Accessed March 19, 2019.
http://hdl.handle.net/10289/12052.
MLA Handbook (7th Edition):
Alshammari, Yousef Namlan. “Production and characterization of titanium based alloys with potential for antifouling and biofouling
.” 2017. Web. 19 Mar 2019.
Vancouver:
Alshammari YN. Production and characterization of titanium based alloys with potential for antifouling and biofouling
. [Internet] [Masters thesis]. University of Waikato; 2017. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/10289/12052.
Council of Science Editors:
Alshammari YN. Production and characterization of titanium based alloys with potential for antifouling and biofouling
. [Masters Thesis]. University of Waikato; 2017. Available from: http://hdl.handle.net/10289/12052
University of New South Wales
8.
Hayazi, Nur Farhana.
Dehydrogenation and consolidation of titanium hydride powder using powder metallurgy routes.
Degree: Materials Science & Engineering, 2013, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/53483
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12178/SOURCE02?view=true
► TiH2 powder has been trialled as an alternative to Ti-powder to fabricate titanium-based products. To enhance the utilization of TiH2 powder, further understanding of the…
(more)
▼ TiH2
powder has been trialled as an alternative to Ti-
powder to fabricate titanium-based products. To enhance the utilization of TiH2
powder, further understanding of the dehydrogenation mechanism of TiH2, the effect of hydrogen on dehydrogenated and equal channel angular pressed (ECAP) samples and on the fabrication of titanium matrix composites (TMC) is critical.This research work analysed the phase transformation steps of TiH2 to Ti using high-temperature X-Ray Diffraction with the dehydrogenation step occurring under both isothermal and non-isothermal conditions. Crystallographic data was obtained through Rietveld analysis. Results showed that, with increasing temperature expansion occurred, which was negated by the phase transformations due to dehydrogenation. The sequence of TiH2 phase transformations were: delta−>delta’−>beta−>beta’−>alpha−>alpha’-phase. Further confirmation of the mechanistic steps was obtained through thermogravimetric analysis, transmission electron microscopy and selected area electron diffraction studies. The dehydrogenation reaction of compacted TiH2
powder was investigated in terms of four parameters, namely, heating rates, compaction pressures, temperatures and times, in order to optimize the dehydrogenation process. The hydrogen loss and bulk density decreased with increasing heating rate while the density and hardness improved with the increasing in temperature and time. TMCs were fabricated using TiH2
powder containing SiC or TiB2 as the reinforcement. In samples with SiC, when the sintering temperature was increased, the density, hardness and the reaction layer (TixSiyCz layer) were found to increase. However, the density and hardness decreased when TiB2
powder content increased. Hardness values were affected by the H2 content in the matrix and the reinforcement.Back-pressure ECAP on sintered TiH2 samples was carried out at 590°C using route C, where the sample is rotated 180° with focus on the hydrogen effect. Density of the ECAP samples reduced when the hydrogen content was increased. The presence of hydrogen improved the hardness and tensile strength, but the ductility was lowered. Dehydrogenation is very crucial step for TiH2
powder because of the phase transition from delta−>beta−>alpha-titanium, which is a critical step in the fabrication of TMC and titanium alloys from TiH2
powder.
Advisors/Committee Members: Chan, Sammy, Materials Science & Engineering, Faculty of Science, UNSW.
Subjects/Keywords: Powder metallurgy; Titanium; Titanium hydride
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APA (6th Edition):
Hayazi, N. F. (2013). Dehydrogenation and consolidation of titanium hydride powder using powder metallurgy routes. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/53483 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12178/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Hayazi, Nur Farhana. “Dehydrogenation and consolidation of titanium hydride powder using powder metallurgy routes.” 2013. Doctoral Dissertation, University of New South Wales. Accessed March 19, 2019.
http://handle.unsw.edu.au/1959.4/53483 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12178/SOURCE02?view=true.
MLA Handbook (7th Edition):
Hayazi, Nur Farhana. “Dehydrogenation and consolidation of titanium hydride powder using powder metallurgy routes.” 2013. Web. 19 Mar 2019.
Vancouver:
Hayazi NF. Dehydrogenation and consolidation of titanium hydride powder using powder metallurgy routes. [Internet] [Doctoral dissertation]. University of New South Wales; 2013. [cited 2019 Mar 19].
Available from: http://handle.unsw.edu.au/1959.4/53483 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12178/SOURCE02?view=true.
Council of Science Editors:
Hayazi NF. Dehydrogenation and consolidation of titanium hydride powder using powder metallurgy routes. [Doctoral Dissertation]. University of New South Wales; 2013. Available from: http://handle.unsw.edu.au/1959.4/53483 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12178/SOURCE02?view=true
University of Missouri – Columbia
9.
Yang, Lingqi.
Molecular dynamics simulation of nanosintering processes.
Degree: 2010, University of Missouri – Columbia
URL: https://doi.org/10.32469/10355/8086
► In this thesis, two scenarios of simulations are studied by molecular dynamics (MD) method. The first one will investigate the neck growth in the laser…
(more)
▼ In this thesis, two scenarios of simulations are studied by molecular dynamics (MD) method. The first one will investigate the neck growth in the laser sintering of different-size gold (100) nanoparticles under different heating rates. The numerical simulations are carried out for four pairs of two spherical nanoparticles where one particle has the same diameter of 4 nm and the other one varied from 4 nm to 20 nm. The results show that the stable neck width increases as the size of the other nanoparticle increases. Once the limit stable neck width is reached, it no longer is affected by the nanoparticle size. For the subsequent laser heating to the same final temperature, a lower heating rate results in a larger stable neck width due to the longer sintering process. The other one will study the deposition of Ni(100) nanocluster with zero initial kinetic energy on Cu(100, 110) surface. It's found that the burrowing process goes extremely slow as temperature is equal or less than 900K. There is no burrowing below 500 K. The completeness of burrowing Ni on Cu(110) is earlier than Cu(100) due to the lower surface energy of Cu(110). Vacancy migration is found to be the main cause of the site-exchange of atoms between Ni cluster and Cu substrate.
Advisors/Committee Members: Zhang, Yuwen, 1965- (advisor), Chen, Jinn-Kuen (advisor).
Subjects/Keywords: Powder metallurgy; Sintering; Nanoparticles; Nanocrystals
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APA (6th Edition):
Yang, L. (2010). Molecular dynamics simulation of nanosintering processes. (Thesis). University of Missouri – Columbia. Retrieved from https://doi.org/10.32469/10355/8086
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Yang, Lingqi. “Molecular dynamics simulation of nanosintering processes.” 2010. Thesis, University of Missouri – Columbia. Accessed March 19, 2019.
https://doi.org/10.32469/10355/8086.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yang, Lingqi. “Molecular dynamics simulation of nanosintering processes.” 2010. Web. 19 Mar 2019.
Vancouver:
Yang L. Molecular dynamics simulation of nanosintering processes. [Internet] [Thesis]. University of Missouri – Columbia; 2010. [cited 2019 Mar 19].
Available from: https://doi.org/10.32469/10355/8086.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yang L. Molecular dynamics simulation of nanosintering processes. [Thesis]. University of Missouri – Columbia; 2010. Available from: https://doi.org/10.32469/10355/8086
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Ryerson University
10.
Ogbuigwe, Daniel.
The Effect of Relative Porosity on the Survivability of a Powder Metallurgy Part During Ejection.
Degree: 2012, Ryerson University
URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A1715
► The desire to produce functional powder metallurgy (PM) components has resulted in higher compression forces during compaction. This in turn increases the ejection stresses and…
(more)
▼ The desire to produce functional powder metallurgy (PM) components has resulted in higher compression forces during compaction. This in turn increases the ejection stresses and therefore the possibility of failure during ejection. This failure can be caused by sprig back during ejection due to frictional forces that are generated between the powder part and the die walls. In order to predict these factors a stress analysis of the powder part during ejection was done. Due to complexity, finite element analysis was used to model the powder during compaction and ejection. Since the ejection stage is the most critical stage of the PM process, it is essential to understand the factors that determine the survivability of a part during this stage. This work uses experimental data, finite element modeling and reliability analysis to determine the probability of failure of metallic powder components during the ejection phase. The results show that there is an increased possibility of failure during ejection as compaction pressure is increased. This information can be used by designers and process planners to determine the optimal process parameters that need to be adopted for optimal outcomes during powder metallurgy.
Subjects/Keywords: Powder metallurgy; Porosity; Powder metallurgy – Mathematical models; Finite element method
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APA (6th Edition):
Ogbuigwe, D. (2012). The Effect of Relative Porosity on the Survivability of a Powder Metallurgy Part During Ejection. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A1715
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ogbuigwe, Daniel. “The Effect of Relative Porosity on the Survivability of a Powder Metallurgy Part During Ejection.” 2012. Thesis, Ryerson University. Accessed March 19, 2019.
https://digital.library.ryerson.ca/islandora/object/RULA%3A1715.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ogbuigwe, Daniel. “The Effect of Relative Porosity on the Survivability of a Powder Metallurgy Part During Ejection.” 2012. Web. 19 Mar 2019.
Vancouver:
Ogbuigwe D. The Effect of Relative Porosity on the Survivability of a Powder Metallurgy Part During Ejection. [Internet] [Thesis]. Ryerson University; 2012. [cited 2019 Mar 19].
Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1715.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ogbuigwe D. The Effect of Relative Porosity on the Survivability of a Powder Metallurgy Part During Ejection. [Thesis]. Ryerson University; 2012. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1715
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Dalhousie University
11.
Beck, Geoffrey.
ON A NOVEL METHOD OF INCORPORATING AN INTERNAL STRUCTURE
INTO GREEN POWDER METALLURGY COMPACTS USING DIE COMPACTION.
Degree: Master of Applied Science, Department of Mechanical Engineering, 2012, Dalhousie University
URL: http://hdl.handle.net/10222/15178
► A novel method of producing die compacted powder metallurgy components with fully en-closed internal structures was developed. The physical characteristics of the compacts were evaluated…
(more)
▼ A novel method of producing die compacted
powder
metallurgy components with fully en-closed internal structures was
developed. The physical characteristics of the compacts were
evaluated by measuring bulk density, internal density gradients and
compressive green strength. Additionally, a finite element
simulation was developed to evaluate the compaction process of the
internal structure compact. The internal structure compact
displayed the anticipated lower bulk densities due to the less
dense internal structure than a conventional
powder metallurgy
compact, however; higher local densities were found within the
internal structure compact at all compaction pressures. Compressive
green strength characteristics showed unique results where the
strength in-creased up to 300 MPa compaction pressure, however; at
400 MPa there was a distinct plat-eau in green strength. This
phenomenon was attributed to an increase in differential shear
stress around the internal structure with a minimal increase in
density from 300 MPa to 400 MPa.
Advisors/Committee Members: Dr. Paul Bishop (external-examiner), Dr. Ya-Jun Pan (graduate-coordinator), Dr. Darrel Doman (thesis-reader), Dr. Ted Hubbard (thesis-reader), Dr. Darrel Doman (thesis-supervisor), Not Applicable (ethics-approval), Not Applicable (manuscripts), Not Applicable (copyright-release).
Subjects/Keywords: Powder Metallurgy; Die Compaction; Internal Strucutres; Densitometry
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Manager
APA (6th Edition):
Beck, G. (2012). ON A NOVEL METHOD OF INCORPORATING AN INTERNAL STRUCTURE
INTO GREEN POWDER METALLURGY COMPACTS USING DIE COMPACTION. (Masters Thesis). Dalhousie University. Retrieved from http://hdl.handle.net/10222/15178
Chicago Manual of Style (16th Edition):
Beck, Geoffrey. “ON A NOVEL METHOD OF INCORPORATING AN INTERNAL STRUCTURE
INTO GREEN POWDER METALLURGY COMPACTS USING DIE COMPACTION.” 2012. Masters Thesis, Dalhousie University. Accessed March 19, 2019.
http://hdl.handle.net/10222/15178.
MLA Handbook (7th Edition):
Beck, Geoffrey. “ON A NOVEL METHOD OF INCORPORATING AN INTERNAL STRUCTURE
INTO GREEN POWDER METALLURGY COMPACTS USING DIE COMPACTION.” 2012. Web. 19 Mar 2019.
Vancouver:
Beck G. ON A NOVEL METHOD OF INCORPORATING AN INTERNAL STRUCTURE
INTO GREEN POWDER METALLURGY COMPACTS USING DIE COMPACTION. [Internet] [Masters thesis]. Dalhousie University; 2012. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/10222/15178.
Council of Science Editors:
Beck G. ON A NOVEL METHOD OF INCORPORATING AN INTERNAL STRUCTURE
INTO GREEN POWDER METALLURGY COMPACTS USING DIE COMPACTION. [Masters Thesis]. Dalhousie University; 2012. Available from: http://hdl.handle.net/10222/15178
Dalhousie University
12.
Sweet, Gregory.
ADVANCED SINTERING TECHNIQUES OF ALUMINUM: SPARK PLASMA
SINTERING.
Degree: Master of Applied Science, Department of Process Engineering and Applied
Science, 2014, Dalhousie University
URL: http://hdl.handle.net/10222/54025
► Spark plasma sintering (SPS) of air atomized aluminum powders was conducted in a fundamental investigation of processing and chemical effects on physical and mechanical properties.…
(more)
▼ Spark plasma sintering (SPS) of air atomized aluminum
powders was conducted in a fundamental investigation of processing
and chemical effects on physical and mechanical properties. Five
air atomized aluminum powders, one of commercial purity, one
magnesium-doped (0.4 wt%), one iron-doped (1.0 wt%), one
nickel-doped (1.0 wt%) and one iron (1.0 wt%) and nickel-doped (1.0
wt%) were processed by SPS means. Where applicable, powders were
also processed by conventional
powder metallurgy (PM). An
investigation of SPS processing parameters and their effect on
sinter quality were of primary concern. Applied pressure and
ultimate processing temperature bore the greatest influence on
processing, while heating rate and hold time showed a minor effect.
Full density specimens were achieved for both powders under select
processing conditions. To compliment this, large (80 mm) and small
(20 mm) diameter samples were made to observe possible up-scaling
effects, as well as tensile properties. Large samples were
successfully processed, albeit with somewhat inferior densities to
the smaller counterparts presumably due to the temperature
inhomogeneity during processing. An investigation into tensile
properties for SPS samples exhibited extensive ductility (~30%) at
high sintering temperatures, while lower temperature SPS samples as
well as all conventional PM processed samples exhibited a brittle
nature. The measurement of residual oxygen and hydrogen contents
showed a significant elimination of both species in SPS samples
under certain processing parameters when compared to conventional
PM equivalents. None of the transition metal additions had an
overtly negative impact on SPS response. As such, all powders were
successfully processed to the full density condition provided that
an appropriate minimum SPS temperature was employed. Hardness
improved as the net concentration of transition metals increased
and was found to be greatest in the Al-Fe-Ni ternary
powder (78
HRH). Microstructural coarsening was apparent in all alloys as a
result of SPS processing. However, the consolidated products
maintained desirable microstructures comprised of homogenous
distributions of sub-micron intermetallics such as Al9FeNi, Al13Fe4
and AlNi3.
Advisors/Committee Members: Ian Donaldson (external-examiner), Dr. Mark Gibson (graduate-coordinator), Dr. Kevin Plucknett (thesis-reader), Dr. Paul Bishop (thesis-supervisor), Not Applicable (ethics-approval), Yes (manuscripts), Yes (copyright-release).
Subjects/Keywords: Powder Metallurgy; Spark Plasma Sintering; Aluminum
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APA ·
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Export
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Manager
APA (6th Edition):
Sweet, G. (2014). ADVANCED SINTERING TECHNIQUES OF ALUMINUM: SPARK PLASMA
SINTERING. (Masters Thesis). Dalhousie University. Retrieved from http://hdl.handle.net/10222/54025
Chicago Manual of Style (16th Edition):
Sweet, Gregory. “ADVANCED SINTERING TECHNIQUES OF ALUMINUM: SPARK PLASMA
SINTERING.” 2014. Masters Thesis, Dalhousie University. Accessed March 19, 2019.
http://hdl.handle.net/10222/54025.
MLA Handbook (7th Edition):
Sweet, Gregory. “ADVANCED SINTERING TECHNIQUES OF ALUMINUM: SPARK PLASMA
SINTERING.” 2014. Web. 19 Mar 2019.
Vancouver:
Sweet G. ADVANCED SINTERING TECHNIQUES OF ALUMINUM: SPARK PLASMA
SINTERING. [Internet] [Masters thesis]. Dalhousie University; 2014. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/10222/54025.
Council of Science Editors:
Sweet G. ADVANCED SINTERING TECHNIQUES OF ALUMINUM: SPARK PLASMA
SINTERING. [Masters Thesis]. Dalhousie University; 2014. Available from: http://hdl.handle.net/10222/54025
13.
Channankaiah.
Study of densification and mechanical properties of HSLA
P/M steels.
Degree: Mechanical Engineering, 2014, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/16955
► Powder metallurgy (P/M) is recognized as one of the most important manufacturing processes for making several industrial products. The production of powder metallurgy parts has…
(more)
▼ Powder metallurgy (P/M) is recognized as one of the
most important manufacturing processes for making several
industrial products. The production of powder metallurgy parts has
been expanding at a significantly faster rate because of the
advantages associated with it. The advantages include compositional
flexibility, minimized segregation, ability to produce graded
microstructures with varying physical and mechanical properties,
quality, cost, precision, productivity, optimized material
utilization, etc. The production of components from HSLA steel has
been in the past through the conventional routes such as metal
casting, forming and forging. Casting the metal into billets and
machining the components from the billets and bringing them to
standard size blocks and required shapes where energy intensive
process that produced large amounts of scrap with material utility
ranging from 50% to 80%. Fine machining, grinding and lapping
operations made this components highly non competitive on the
economic front. Keeping this in mind, in the present investigation,
it is envisaged to adapt P/M route coupled with certain
conventional process to produce components in close tolerance with
the design. It is necessary to investigate the fundamentals,
involved in preparing suitable preforms, sintering them at well
specified temperature for a length of time and then forging them at
newlinespecified temperature. Tests for evaluating the mechanical
properties of the newlinespecimens will be performed in order to
understand the constraints and newlinesuitable components can be
manufactured economically. The main objective of this present
research work is to develop the newlineHSLA steels. The powder
mixes of HSLA steels were prepared from the newlineelemental
powders such as manganese, chromium and molybdenum. Three
newlinedifferent compositions of AISI 4140 steel powder mixes were
mixed in a pot newlinemill for the period of 12 hours at room
temperature. newline
References p. 156-163
Advisors/Committee Members: Ranganath G.
Subjects/Keywords: HSLA steels; Mechanical Engineering; Powder metallurgy
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Manager
APA (6th Edition):
Channankaiah. (2014). Study of densification and mechanical properties of HSLA
P/M steels. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/16955
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Channankaiah. “Study of densification and mechanical properties of HSLA
P/M steels.” 2014. Thesis, Anna University. Accessed March 19, 2019.
http://shodhganga.inflibnet.ac.in/handle/10603/16955.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Channankaiah. “Study of densification and mechanical properties of HSLA
P/M steels.” 2014. Web. 19 Mar 2019.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
Channankaiah. Study of densification and mechanical properties of HSLA
P/M steels. [Internet] [Thesis]. Anna University; 2014. [cited 2019 Mar 19].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/16955.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Channankaiah. Study of densification and mechanical properties of HSLA
P/M steels. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/16955
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation
Northeastern University
14.
Li, Yangfan.
Densification and bonding of copper and aluminum powders.
Degree: MS, Department of Mechanical and Industrial Engineering, 2012, Northeastern University
URL: http://hdl.handle.net/2047/d20002900
► Ultrasonic powder consolidation (UPC) is a novel rapid, full-density powder consolidation process in which metal powders confined in a die under uniaxial loading is subjected…
(more)
▼ Ultrasonic powder consolidation (UPC) is a novel rapid, full-density powder consolidation process in which metal powders confined in a die under uniaxial loading is subjected to ultrasonic vibration at low temperature for a few seconds or less. In this research, copper powders with dendritic and spherical morphologies and an aluminum powder with spherical morphology were subjected to UPC under various conditions to investigate the effects of the process variables on the densification and metallurgical bonding of the compact. An ultrasonic washing test, developed in this research, was used to determine the extent of densification and bonding achieved in specimens consolidated under systematically varied UPC conditions. Hardness testing was also employed as a supplementary means for the assessment of compact density in both as-consolidated and ultrasonically washed states. The degree of metallurgical bonding was also qualitatively assessed from the fracture surfaces of manually broken specimens.; With the dendritic and spherical copper powders, the minimum consolidation temperature, time and uniaxial pressure required for nearly full densification were determined to be 450 °C, 4 s and 84 MPa, respectively. The best conditions were 500 °C, 4 s and 100 MPa for both copper powders. Dendritic-powder specimens exhibited better densification and bonding than spherical-powder specimens above 450 °C. However, below 450 °C, the spherical powder produced better results, due probably to its higher packing geometry and repacking under the ultrasonic vibrations. With the spherical aluminum powder, specimens with best densification and bonding were obtained under the conditions of 400 °C, 2.5 s and 80 MPa.; Compact densification generally requires a good amount of powder deformation. In UPC, this occurs very quickly in a fraction of a second if consolidation temperature is sufficiently high. However, a high degree of compact densification does not necessarily assure good metallurgical bonding. Bonding must be preceded by the formation of nascent metal-to-metal contact of powder particles, which requires good compact densification. Thus, densification is only a necessary condition for bonding. For the copper compacts, metallurgical bonding, at a given temperature, increased with increasing consolidation time, indicating that bonding is a thermally activated (diffusional) process. Densification of dendritic powder produced more fresh metal surface and hence higher degrees of bonding. The bonding in the aluminum compacts, however, followed densification more closely, reflecting the higher homologuos temperatures (up to 0.72 of the melting point in K).
Subjects/Keywords: ultrasonic powder consolidation; densification; Mechanical Engineering; Metallurgy
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APA ·
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Manager
APA (6th Edition):
Li, Y. (2012). Densification and bonding of copper and aluminum powders. (Masters Thesis). Northeastern University. Retrieved from http://hdl.handle.net/2047/d20002900
Chicago Manual of Style (16th Edition):
Li, Yangfan. “Densification and bonding of copper and aluminum powders.” 2012. Masters Thesis, Northeastern University. Accessed March 19, 2019.
http://hdl.handle.net/2047/d20002900.
MLA Handbook (7th Edition):
Li, Yangfan. “Densification and bonding of copper and aluminum powders.” 2012. Web. 19 Mar 2019.
Vancouver:
Li Y. Densification and bonding of copper and aluminum powders. [Internet] [Masters thesis]. Northeastern University; 2012. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/2047/d20002900.
Council of Science Editors:
Li Y. Densification and bonding of copper and aluminum powders. [Masters Thesis]. Northeastern University; 2012. Available from: http://hdl.handle.net/2047/d20002900
Hong Kong University of Science and Technology
15.
Wu, Kai Chiu.
Fundamental radiative heat transfer analysis of a packed sphere system for powder applications.
Degree: 1998, Hong Kong University of Science and Technology
URL: https://doi.org/10.14711/thesis-b612523
;
http://repository.ust.hk/ir/bitstream/1783.1-5199/1/th_redirect.html
► One of the popular manufacturing process in industry is the rapid sintering, however, due to the limited time, there always exists thermal gradient inside. This…
(more)
▼ One of the popular manufacturing process in industry is the rapid sintering, however, due to the limited time, there always exists thermal gradient inside. This thermal gradient has deterministic effect on the microstructure of the greenware and hence the quality of the final product. Therefore, in order to understand this complex process, the first step is study its heat transfer behavior. Since thermal radiation is the dominant mode of energy transport, it is important to understand its behavior. In this work, the greenware is modeled as a system of uniform sized packed sphere. The objective of this work is to develop the basis ground for computing the temperature solution. A non-statistical ray tracing scheme has been developed for studying different packed sphere system such as specular, diffuse and directional reflecting spheres. Also, an two-objective functions typed inversion scheme has been setup for accurately capture the system properties of the system. Due to the fact that the microstructure has direct effect on the final product's quality. In this study, it is also taken care. A random packing algorithm has been developed to study the microstructural behavior - the mean coordination number and the mean contact area, of the packed structure.
Subjects/Keywords: Sintering; Powder metallurgy
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Manager
APA (6th Edition):
Wu, K. C. (1998). Fundamental radiative heat transfer analysis of a packed sphere system for powder applications. (Thesis). Hong Kong University of Science and Technology. Retrieved from https://doi.org/10.14711/thesis-b612523 ; http://repository.ust.hk/ir/bitstream/1783.1-5199/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wu, Kai Chiu. “Fundamental radiative heat transfer analysis of a packed sphere system for powder applications.” 1998. Thesis, Hong Kong University of Science and Technology. Accessed March 19, 2019.
https://doi.org/10.14711/thesis-b612523 ; http://repository.ust.hk/ir/bitstream/1783.1-5199/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wu, Kai Chiu. “Fundamental radiative heat transfer analysis of a packed sphere system for powder applications.” 1998. Web. 19 Mar 2019.
Vancouver:
Wu KC. Fundamental radiative heat transfer analysis of a packed sphere system for powder applications. [Internet] [Thesis]. Hong Kong University of Science and Technology; 1998. [cited 2019 Mar 19].
Available from: https://doi.org/10.14711/thesis-b612523 ; http://repository.ust.hk/ir/bitstream/1783.1-5199/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wu KC. Fundamental radiative heat transfer analysis of a packed sphere system for powder applications. [Thesis]. Hong Kong University of Science and Technology; 1998. Available from: https://doi.org/10.14711/thesis-b612523 ; http://repository.ust.hk/ir/bitstream/1783.1-5199/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
16.
Tellier, Gabriel.
Characterization of gamma prime precipitates in a powder metallurgy nickel-based superalloy.
Degree: Mechanical Engineering, 2017, University of Manitoba
URL: http://hdl.handle.net/1993/32642
► Nickel-based superalloys see wide use in applications requiring high strengths at high temperatures, notably in the blades of gas turbines. An important contributor to this…
(more)
▼ Nickel-based superalloys see wide use in applications requiring high strengths at high temperatures, notably in the blades of gas turbines. An important contributor to this superior high-temperature strength is the presence of Gamma Prime precipitates.
This project characterizes the behaviour of a PM nickel-based superalloy consisting of Ni-12Cr-9Fe (w/o) with the addition of 6w/o Al and 0.5w/o Si to refine prediction of precipitate size, improving control of the material properties.
The solutionization temperature of Gamma Prime in this alloy was modeled using JMatPro sofware (1040?C), and verified using a Differential Scanning Calorimeter (1092?C). Precise temperature control was found to be more important to control material properties than exact ageing times. Using an Atomic Force Microscope, precipitates in the nanometer range were imaged, and analysed using ImageJ software. A thermo-mechanical deformation procedure increased sample density slightly (5.3%), and is limited to 30% deformation.
Advisors/Committee Members: Caley, William F. (Mechanical Engineering), Cahoon, John R. (Mechanical Engineering).
Subjects/Keywords: Powder metallurgy
…𝟗𝟗𝟗𝟔
Equation 5 .......... 59
Page | x
List of Abbreviations
PM: Powder Metallurgy
HIP… …behaviour of a powder-metallurgy nickel-based
superalloy consisting of Ni-12Cr-9Fe (w/o)… …nickel-based powder metallurgy alloy similar to Inconel 600, to enable better control of the… …can be found in Section 4: Materials and Methods.
2.1.
Powder Metallurgy
Although a less… …widespread technique than casting or forging, Powder Metallurgy (PM)
nonetheless has been…
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APA (6th Edition):
Tellier, G. (2017). Characterization of gamma prime precipitates in a powder metallurgy nickel-based superalloy. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/32642
Chicago Manual of Style (16th Edition):
Tellier, Gabriel. “Characterization of gamma prime precipitates in a powder metallurgy nickel-based superalloy.” 2017. Masters Thesis, University of Manitoba. Accessed March 19, 2019.
http://hdl.handle.net/1993/32642.
MLA Handbook (7th Edition):
Tellier, Gabriel. “Characterization of gamma prime precipitates in a powder metallurgy nickel-based superalloy.” 2017. Web. 19 Mar 2019.
Vancouver:
Tellier G. Characterization of gamma prime precipitates in a powder metallurgy nickel-based superalloy. [Internet] [Masters thesis]. University of Manitoba; 2017. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/1993/32642.
Council of Science Editors:
Tellier G. Characterization of gamma prime precipitates in a powder metallurgy nickel-based superalloy. [Masters Thesis]. University of Manitoba; 2017. Available from: http://hdl.handle.net/1993/32642
KTH
17.
Nabeel, Muhammad.
Diffusion of Elemental Additives during Sintering.
Degree: Materials Science and Engineering, 2012, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-100702
► The mechanical properties of components made by PM steels are normally inferior to those made by alternative processes. One of the main reasons is…
(more)
▼ The mechanical properties of components made by PM steels are normally inferior to those made by alternative processes. One of the main reasons is that a large amount of pores are present in sintered components. The other main reason is that the alloying elements, particularly Ni, are not uniformly distributed after conventional sintering procedures. This work is aimed at a better understanding of the influence of alloying additions on mechanical properties and homogeneity of the microstructure. The experimental work has been carried out in two trials. Trial 1 was performed to investigate mechanical properties of Distaloy powders (commercial grades) and second trial to examine influence of alloying additions on homogeneity of microstructure. For trial 1, as-sintered and heat treated specimens were produced by mixing commercial powders with two different carbon levels. Whereas, alloying elements were admixed to base iron powder for producing sintered specimens for trial 2. Mechanical properties including dimensional changes, micro-hardness, tensile strength and impact resistance were measured. Distribution of alloying elements was studied using LOM and SEM-EDS analysis. The results obtained show that additions of alloying elements enhance the mechanical properties. Moreover, interaction of C with Cu and Ni as well as interaction between Cu and Ni have a deceive role in determining final properties of the components. The metallographic investigation indicated that major reasons of heterogeneous microstructure are slow diffusion of Ni in Fe matrix and interaction of other alloying elements with Ni. The results of trial 2 showed that addition of Mo and Cu to Ni-containing PM steels improves the distribution of Ni in Fe matrix. Mo results in improved uniformity of microstructure by lowering the chemical potential of carbon. In Ni and Cu containing alloys, the interaction between Ni and Cu is responsible for enhanced distribution of Ni. However, the improved Ni distribution is achieved at the expense of non-uniform distribution of Cu. In Ni-containing PM steels, improved microstructure homogenization can be attained by increasing Ni-Cu interaction, lowering the surface energy of Ni-Cu liquid and decreasing the chemical potential of carbon.
Subjects/Keywords: Diffusion; distribution; alloying elements; powder metallurgy
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APA (6th Edition):
Nabeel, M. (2012). Diffusion of Elemental Additives during Sintering. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-100702
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nabeel, Muhammad. “Diffusion of Elemental Additives during Sintering.” 2012. Thesis, KTH. Accessed March 19, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-100702.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nabeel, Muhammad. “Diffusion of Elemental Additives during Sintering.” 2012. Web. 19 Mar 2019.
Vancouver:
Nabeel M. Diffusion of Elemental Additives during Sintering. [Internet] [Thesis]. KTH; 2012. [cited 2019 Mar 19].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-100702.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nabeel M. Diffusion of Elemental Additives during Sintering. [Thesis]. KTH; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-100702
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waikato
18.
Thabarealam, Tharikalam.
Production, Processing and Characterisation of Porous TiAl Alloy Produced Using Space Holder Method.
Degree: 2009, University of Waikato
URL: http://hdl.handle.net/10289/3263
► In the 21st century metals and alloys are considered to be the base for all manufacturing and engineering applications. Titanium and its alloys are examples…
(more)
▼ In the 21st century metals and alloys are considered to be the base for all manufacturing and engineering applications. Titanium and its alloys are examples of these, well known for their excellent corrosion resistance, high strength to weight ratio, good mechanical properties and biocompatibility.
In the present study, production of porous titanium alloys using the space holder technique was taken into account. The porous titanium alloy was manufactured by powder metallurgy process. Production of porous titanium alloys using Ammonium-Bi-Carbonate ( ) and Salt (analytical NaCl) as spacer materials with different compositions has been investigated. The raw materials used for production and characterization were obtained from the Titanox Development Ltd, Auckland, TiAl powder, HDH pure titanium powder. Processing, characterization, and mechanical properties such as test and result of optical microscope, Scanning Electron Microscope (SEM), X-ray diffraction, micro-hardness, Differential Thermal Analysis (DTA) is presented for the porous titanium alloys. It was found that porous titanium has porosities in the range of 25-45% with density ranges from 2.5 to 3.0 for both the spacer materials respectively. Porous structure was determined with the removal of spacer material through sintering process. The sintering process of each spacer material depends on the melting point of the spacer material.
Subjects/Keywords: Porous titanium alloys;
Powder metallurgy;
XRD;
Sintering
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APA (6th Edition):
Thabarealam, T. (2009). Production, Processing and Characterisation of Porous TiAl Alloy Produced Using Space Holder Method.
(Masters Thesis). University of Waikato. Retrieved from http://hdl.handle.net/10289/3263
Chicago Manual of Style (16th Edition):
Thabarealam, Tharikalam. “Production, Processing and Characterisation of Porous TiAl Alloy Produced Using Space Holder Method.
” 2009. Masters Thesis, University of Waikato. Accessed March 19, 2019.
http://hdl.handle.net/10289/3263.
MLA Handbook (7th Edition):
Thabarealam, Tharikalam. “Production, Processing and Characterisation of Porous TiAl Alloy Produced Using Space Holder Method.
” 2009. Web. 19 Mar 2019.
Vancouver:
Thabarealam T. Production, Processing and Characterisation of Porous TiAl Alloy Produced Using Space Holder Method.
[Internet] [Masters thesis]. University of Waikato; 2009. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/10289/3263.
Council of Science Editors:
Thabarealam T. Production, Processing and Characterisation of Porous TiAl Alloy Produced Using Space Holder Method.
[Masters Thesis]. University of Waikato; 2009. Available from: http://hdl.handle.net/10289/3263
Mississippi State University
19.
Allison, Paul Galon.
STRUCTURE-PROPERTY RELATIONS FOR MONOTONIC AND FATIGUE LOADING CONDITIONS FOR A POWDER METAL STEEL.
Degree: PhD, Mechanical Engineering, 2009, Mississippi State University
URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07082009-170520/
;
► Developing a multi-scale math-based model for powder metallurgy (PM) component design and performance prediction requires experimental calibration and validation. Monotonic tension, compression and torsion tests…
(more)
▼ Developing a multi-scale math-based model for
powder metallurgy (PM) component design and performance prediction requires experimental calibration and validation. Monotonic tension, compression and torsion tests were performed at various porosity and temperatures to obtain the set of plasticity and damage constants required for model calibration. Uniaxial fatigue experiments were performed to determine the constants required for capturing the low cycle and high cycle fatigue characteristics of a PM steel. Tension tests on two different Bridgman notched specimens were undertaken to study the damage-triaxiality dependence for model validation. Validation of the model is further being performed by monotonic component testing using PM bearing caps. Fracture surface analysis was performed using Scanning Electron Microscopy (SEM) to quantify the void nucleation and void sizes of the different specimens. The developed model will be used for optimizing component performance and design for PM parts.
Advisors/Committee Members: Dr. Mark F. Horstemeyer (chair), Dr. John T. Berry (committee member), Dr. Youssef Hammi (committee member), Dr. Haitham El Kadiri (committee member).
Subjects/Keywords: Powder Metallurgy; FC-0205; Mechanical Testing; Fatigue
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APA (6th Edition):
Allison, P. G. (2009). STRUCTURE-PROPERTY RELATIONS FOR MONOTONIC AND FATIGUE LOADING CONDITIONS FOR A POWDER METAL STEEL. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-07082009-170520/ ;
Chicago Manual of Style (16th Edition):
Allison, Paul Galon. “STRUCTURE-PROPERTY RELATIONS FOR MONOTONIC AND FATIGUE LOADING CONDITIONS FOR A POWDER METAL STEEL.” 2009. Doctoral Dissertation, Mississippi State University. Accessed March 19, 2019.
http://sun.library.msstate.edu/ETD-db/theses/available/etd-07082009-170520/ ;.
MLA Handbook (7th Edition):
Allison, Paul Galon. “STRUCTURE-PROPERTY RELATIONS FOR MONOTONIC AND FATIGUE LOADING CONDITIONS FOR A POWDER METAL STEEL.” 2009. Web. 19 Mar 2019.
Vancouver:
Allison PG. STRUCTURE-PROPERTY RELATIONS FOR MONOTONIC AND FATIGUE LOADING CONDITIONS FOR A POWDER METAL STEEL. [Internet] [Doctoral dissertation]. Mississippi State University; 2009. [cited 2019 Mar 19].
Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07082009-170520/ ;.
Council of Science Editors:
Allison PG. STRUCTURE-PROPERTY RELATIONS FOR MONOTONIC AND FATIGUE LOADING CONDITIONS FOR A POWDER METAL STEEL. [Doctoral Dissertation]. Mississippi State University; 2009. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07082009-170520/ ;
University of Ottawa
20.
Kuforiji, Catherine.
Development of Steel-Alumina Composites for Wear Applications
.
Degree: 2017, University of Ottawa
URL: http://hdl.handle.net/10393/36149
► Ceramic-metal matrix composites produced by powder metallurgy provide a solution in engineering applications where materials with high wear resistance are required. In the mining industry,…
(more)
▼ Ceramic-metal matrix composites produced by powder metallurgy provide a solution in engineering applications where materials with high wear resistance are required. In the mining industry, the wear of materials is a crucial and widely recognized industrial problem as over 50 % of components fail as a result of wear damage. Increasing the wear resistance of these components will contribute to a reduction in maintenance and thereby increase efficiency.
In this present research, SS316L-50wt.% Al2O3 composites were fabricated using the powder metallurgy route. The effects of the powder metallurgy processing parameters were studied. The produced cermet composites were characterized with respect to microstructure, density, hardness and toughness. Furthermore, the wear behavior of the composites was studied using pin-on-disc testing under dry sliding conditions. The produced test results were used to improve existing wear models, particularly the Wayne’s model.
The highest hardness of 1085.2 HV, the highest density of 94.7 % and the lowest wear rate of 0.00397 mm3/m were obtained at a milling speed of 720 rpm, a compaction pressure of 794.4 MPa and sintering at 1400 °C in an argon atmosphere. Compared to commercial SS316 and fabricated SS316L, the composites had 7.4 times and 11 times lower wear rate, respectively. However, it is shown that using better densification methods such as hot isostatic pressing (HIP) or hot pressing can further substantial enhanced densification and improve of the composites wear resistance.
Similar to its effects of the strength and the toughness, the remaining porosity was found to substantially affect the wear resistance of the sintered composites. Therefore, the porosity was used to correct the abrasion parameter in the first step of wear model improvement. The porosity represented a further consideration of the microstructure in addition to the reinforcement particle size introduced earlier by Wayne. In a second model improvement step, the test conditions were introduced in the wear resistance calculation. This model allowed the prediction of corrected wear resistance values that are characteristic of the individual test materials and are widely independent of wear test conditions. The coefficient of correlation of the model was 0.91 with respect to Wayne's data and wear test results from this study, and was 0.66 after generalization to a large range of wear data measured on multiple materials tested under varying test conditions. This opens a potential avenue for a model-based assessment of the wear resistance of novel materials as well as changes that can be expected under different wear conditions.
Subjects/Keywords: SS316L, Alumina;
Composites;
Powder metallurgy;
Wear resistance
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APA (6th Edition):
Kuforiji, C. (2017). Development of Steel-Alumina Composites for Wear Applications
. (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/36149
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kuforiji, Catherine. “Development of Steel-Alumina Composites for Wear Applications
.” 2017. Thesis, University of Ottawa. Accessed March 19, 2019.
http://hdl.handle.net/10393/36149.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kuforiji, Catherine. “Development of Steel-Alumina Composites for Wear Applications
.” 2017. Web. 19 Mar 2019.
Vancouver:
Kuforiji C. Development of Steel-Alumina Composites for Wear Applications
. [Internet] [Thesis]. University of Ottawa; 2017. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/10393/36149.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kuforiji C. Development of Steel-Alumina Composites for Wear Applications
. [Thesis]. University of Ottawa; 2017. Available from: http://hdl.handle.net/10393/36149
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Windsor
21.
Boudreau, Douglas B.
Characterization of Powder Metallurgy Lightweight Alloys.
Degree: MA, Electrical and Computer Engineering, 2017, University of Windsor
URL: https://scholar.uwindsor.ca/etd/7239
► Over the past few decades, the automotive industry has seen a steady increase in the amount of powder metallurgy products that have been included…
(more)
▼ Over the past few decades, the automotive industry has seen a steady increase in the amount of
powder metallurgy products that have been included in modern vehicles. The majority of the parts were cold press and sintered products that allowed for a high production volume and low cost option. In more recent years, the
powder metallurgy parts have seen service as structural parts mainly consisting of steel base products. The mechanical and dynamic properties of four lightweight materials produced by
powder metallurgy and additive manufactured are tested to determine if they are suitable to be used in a structural part within an internal combustion engine. The research concluded that an additive manufactured titanium material was the only tested material that met or exceeded the current requirements for strength to be a suitable material. The selected material showed low porosity that resulted in suitable fatigue and mechanical properties for a possible substation of the reference material.
Advisors/Committee Members: Edrisy, Afsaneh.
Subjects/Keywords: Aluminum; Fatigue; Lightweight; Powder Metallurgy; Sintered; Titanium
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APA (6th Edition):
Boudreau, D. B. (2017). Characterization of Powder Metallurgy Lightweight Alloys. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/7239
Chicago Manual of Style (16th Edition):
Boudreau, Douglas B. “Characterization of Powder Metallurgy Lightweight Alloys.” 2017. Masters Thesis, University of Windsor. Accessed March 19, 2019.
https://scholar.uwindsor.ca/etd/7239.
MLA Handbook (7th Edition):
Boudreau, Douglas B. “Characterization of Powder Metallurgy Lightweight Alloys.” 2017. Web. 19 Mar 2019.
Vancouver:
Boudreau DB. Characterization of Powder Metallurgy Lightweight Alloys. [Internet] [Masters thesis]. University of Windsor; 2017. [cited 2019 Mar 19].
Available from: https://scholar.uwindsor.ca/etd/7239.
Council of Science Editors:
Boudreau DB. Characterization of Powder Metallurgy Lightweight Alloys. [Masters Thesis]. University of Windsor; 2017. Available from: https://scholar.uwindsor.ca/etd/7239
Drexel University
22.
Schade, Christopher.
Processing, microstructures and properties of a dual phase precipitation-hardening PM stainless steel.
Degree: 2010, Drexel University
URL: http://hdl.handle.net/1860/3421
► To improve the mechanical properties of PM stainless steels in comparison with their wrought counterparts, a PM stainless steel alloy was developed which combines a…
(more)
▼ To improve the mechanical properties of PM stainless steels in comparison with their wrought counterparts, a PM stainless steel alloy was developed which combines a dualphasemicrostructure with precipitation-hardening. The use of a mixed microstructure of martensite and ferrite results in an alloy with a combination of the optimum properties of each phase, namely strength and ductility. The use of precipitation hardening via the addition of copper results in additional strength and hardness. A range of compositions was studied in combination with various sintering conditions to determine the optimal thermal processing to achieve the desired microstructure. The microstructure could be varied from predominately ferrite to one containing a high percentage of martensite by additions of copper and a variation of the sintering temperature before rapid cooling. Mechanical properties (transverse rupture strength (TRS), yield strength, tensile strength, ductility and impact toughness) were measured as a function of the v/o ferrite in the microstructure. A dual phase alloy with the optimal combination of properties served as the base for introducing precipitation hardening. Copper was added to the base alloy at various levels and its effect on the microstructure and mechanical properties was quantified. Processing at various sintering temperatures led to a range of microstructures; dilatometry was used utilized to monitor and understand the transformations and the formation of the two phases.The aging process was studied as a function of temperature and time by measuring TRS, yield strength, tensile strength, ductility, impact toughness and apparent hardness. It wasdetermined that optimum aging was achieved at 538 °C for 1h. Aging at slightly lower temperatures led to the formation of carbides, which contributed to reduced hardness andtensile strength. As expected, at the peak aging temperature, an increase in yield strength and ultimate tensile strength as well as apparent hardness was found. Aging also lead toan unexpected and concurrent increase in ductility and impact toughness. The alloys also showed an increase in strain hardening on aging. The increase in ductility varied with thev/o martensite in the microstructure and was shown to occur after short time intervals at the optimum aging temperature. Compressive strength measurements revealed that theincrease in ductility was due to the relaxation of residuals stresses that occur when the high temperature austenite transforms to martensite in the dual phase microstructure. Thespecific volume of martensite is much larger than that of austenite so that when the transformation takes place, a compressive stress is induced in the ferrite. In the sintered state, the residual stress leads to a higher work hardening rate in tension. When the alloy is aged, the work hardening rate is reduced and the ductility is increased compared with the sintered state, even though aging increases the strength and apparent hardness.
Ph.D., Materials Science and Engineering – Drexel…
Advisors/Committee Members: Zavaliangos, Antonios, Doherty, R. D. (Roger Davidge), 1939-, Lawley, Alan.
Subjects/Keywords: Materials science; Powder metallurgy; Stainless steel
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APA (6th Edition):
Schade, C. (2010). Processing, microstructures and properties of a dual phase precipitation-hardening PM stainless steel. (Thesis). Drexel University. Retrieved from http://hdl.handle.net/1860/3421
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Schade, Christopher. “Processing, microstructures and properties of a dual phase precipitation-hardening PM stainless steel.” 2010. Thesis, Drexel University. Accessed March 19, 2019.
http://hdl.handle.net/1860/3421.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Schade, Christopher. “Processing, microstructures and properties of a dual phase precipitation-hardening PM stainless steel.” 2010. Web. 19 Mar 2019.
Vancouver:
Schade C. Processing, microstructures and properties of a dual phase precipitation-hardening PM stainless steel. [Internet] [Thesis]. Drexel University; 2010. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/1860/3421.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Schade C. Processing, microstructures and properties of a dual phase precipitation-hardening PM stainless steel. [Thesis]. Drexel University; 2010. Available from: http://hdl.handle.net/1860/3421
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
KTH
23.
Hultén, Leo.
Investigation and Evaluation of Metal Powder Characterization Techniques : Currently available at the KTH Department of Material Science and Engineering.
Degree: Materials Science and Engineering, 2018, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231469
► The KTH Department of Materials Science and Engineering has lacked powder metallurgy research for many years, and as this field is constantly gaining in…
(more)
▼ The KTH Department of Materials Science and Engineering has lacked powder metallurgy research for many years, and as this field is constantly gaining in importance, such research needs to be reestablished. This requires the department to be able to accurately and efficiently characterize the properties of a powder, such as size distribution and composition, and in the short term, this needs to be done using non-specialized equipment. This project aimed to assess the availability and usefulness of both traditional and novel characterization methods by way of trial characterization experiments as well as a literature review. The experiments resulted in some data about three sample powders, as well as the conclusions that size distribution could be effectively characterized by automatized image analysis, composition could be characterized using Energy Dispersive X-ray Spectroscopy and that sample preparation was key to good results. It was concluded that the department could conceivably evaluate the most important properties, but that sampling and sample preparation routines need to be established to ensure efficient characterization and representative data.
Materialinstitutionen på Kungliga Tekniska högskolan har i många år helt saknat pulvermetallurgiforskning och eftersom detta fält ständigt blir mer relevant behöver denna forskning återetableras. Detta kräver att institutionen med tillräcklig noggrannhet och effektivitet kan bestämma egenskaper hos ett pulver, såsom storleksfördelning och sammansättning, och på kort sikt behöver detta ske med ickespecialiserad utrustning. I detta projekt har tillgänglighet och användbarhet hos både traditionella och innovativa analysmetoder utvärderats med hjälp av experimentell karaktärisering av pulver samt en litteraturstudie. Experimenten gav data om de tre undersökta pulvren och resulterade även i slutsatsen att storleksfördelning kunde bestämmas med automatiserad bildanalys, att samansättning kunde bestämmas med Energi Dispersiv Röntgen Spektroskopi och att provpreparering äravgörande för bra resultat. Av detta följer att institutionen rimligtvis kan bestämma de viktigaste egenskaperna hos ett pulver, men att rutiner för provtagning och provpreparering behöver etableras för att säkerställa effektiv analys och representativ data.
Subjects/Keywords: Powder Metallurgy; Metal Powder Characterisation; Evaluation; Investigation; Metal Powder Characterisation Techniques; assessment; Materials Engineering; Materialteknik
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APA (6th Edition):
Hultén, L. (2018). Investigation and Evaluation of Metal Powder Characterization Techniques : Currently available at the KTH Department of Material Science and Engineering. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231469
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hultén, Leo. “Investigation and Evaluation of Metal Powder Characterization Techniques : Currently available at the KTH Department of Material Science and Engineering.” 2018. Thesis, KTH. Accessed March 19, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231469.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hultén, Leo. “Investigation and Evaluation of Metal Powder Characterization Techniques : Currently available at the KTH Department of Material Science and Engineering.” 2018. Web. 19 Mar 2019.
Vancouver:
Hultén L. Investigation and Evaluation of Metal Powder Characterization Techniques : Currently available at the KTH Department of Material Science and Engineering. [Internet] [Thesis]. KTH; 2018. [cited 2019 Mar 19].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231469.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hultén L. Investigation and Evaluation of Metal Powder Characterization Techniques : Currently available at the KTH Department of Material Science and Engineering. [Thesis]. KTH; 2018. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231469
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Dalhousie University
24.
Burke, Paul.
Investigation of the Sintering Fundamentals of Magnesium
Powders.
Degree: PhD, Department of Process Engineering and Applied
Science, 2011, Dalhousie University
URL: http://hdl.handle.net/10222/13574
► Magnesium and its alloys are attractive for use in automotive and aerospace applications because of their low density and good mechanical properties. However, difficulty in…
(more)
▼ Magnesium and its alloys are attractive for use in
automotive and aerospace applications because of their low density
and good mechanical properties. However, difficulty in forming
magnesium and the limited number of available commercial alloys
limit their use.
Powder metallurgy (P/M) can be used to alleviate
the formability problem through near-net-shape processing. The
surface layer on Mg powders acts as a barrier to diffusion and
sintering is problematic. X-ray photoelectron spectroscopy (XPS)
was used to identify the composition of the layer, as well as a
focused ion beam (FIB) process for obtaining thin films was
utilized to prepare samples for analysis with transmission electron
microscopy (TEM). Sintering of pure magnesium compacts has been
studied by differential scanning calorimetry (DSC), which
identified several decomposition reactions during heating. It was
also found that alloying additions of calcium and yttrium promote
surface layer disruption during sintering by DSC measurements and
testing indicates improved mechanical properties.
Advisors/Committee Members: Antonios Zavaliangos (external-examiner), G. J. Kipouros (graduate-coordinator), T. Okabe, D. P. Bishop, W. Caley (thesis-reader), G. J. Kipouros (thesis-supervisor), Not Applicable (ethics-approval), Not Applicable (manuscripts), Not Applicable (copyright-release).
Subjects/Keywords: Magnesium sintering; magnesium powder; powder metallurgy;
surface layers
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APA (6th Edition):
Burke, P. (2011). Investigation of the Sintering Fundamentals of Magnesium
Powders. (Doctoral Dissertation). Dalhousie University. Retrieved from http://hdl.handle.net/10222/13574
Chicago Manual of Style (16th Edition):
Burke, Paul. “Investigation of the Sintering Fundamentals of Magnesium
Powders.” 2011. Doctoral Dissertation, Dalhousie University. Accessed March 19, 2019.
http://hdl.handle.net/10222/13574.
MLA Handbook (7th Edition):
Burke, Paul. “Investigation of the Sintering Fundamentals of Magnesium
Powders.” 2011. Web. 19 Mar 2019.
Vancouver:
Burke P. Investigation of the Sintering Fundamentals of Magnesium
Powders. [Internet] [Doctoral dissertation]. Dalhousie University; 2011. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/10222/13574.
Council of Science Editors:
Burke P. Investigation of the Sintering Fundamentals of Magnesium
Powders. [Doctoral Dissertation]. Dalhousie University; 2011. Available from: http://hdl.handle.net/10222/13574
Texas A&M University
25.
Thompson, Chad 1984-.
A Rotating Electrode System for the Generation of Metal Alloy Microspheres.
Degree: 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/148295
► TerraPower LLC is designing a fast breed and burn reactor intended to operate for up to 40 years without refueling, designated as the Travelling Wave…
(more)
▼ TerraPower LLC is designing a fast breed and burn reactor intended to operate for up to 40 years without refueling, designated as the Travelling Wave Reactor (TWR). Various U-Zr alloy fuel designs have been proposed for the TWR that may require a
powder feed for fabrication. A simple and economic option for laboratory scale
powder production is the Rotating Electrode Process (REP), which produces microsphere shaped
powder by melting the tip of a rotating bar with an electric arc. In order to fully characterize this process for various U-Zr alloys and provide the feed material for testing fabrication techniques, a Rotating Electrode System (RES) was designed and built.
The RES is largely based on a combination of two designs; an early REP system developed by Starmet Corporation in the 19xxa and a later design optimized for U-Mo
powder production by Idaho National Laboratory (INL). The RES designed for this work was improved based on input from vendors specializing in their respective areas of expertise and is capable of atomizing up to a 1.26 cm diameter metal alloy rod at 40,000 RPM. Every component of the machine can be disassembled and transferred through a 35.56 cm (14 in) diameter air lock of a glovebox so that it can operate in a controlled environment.
The RES was tested by atomizing various diameter copper rods to prove system functionality. The tests were carried out in air using an argon cover gas in the
powder collection chamber, known as the catch pan to limit oxidation rates of the newly generated microspheres. The
powder produced showed strong sphericity ranging from 50 ?m to 500 ?m in diameter. Problems and areas of concern that were encountered during operation have been addressed so that the RES can be further optimized to better atomize U-Zr alloys once transferred into the glovebox.
Advisors/Committee Members: McDeavitt, Sean M (advisor), Shao, Lin (committee member), Wang, Haiyan (committee member).
Subjects/Keywords: Powder Metallurgy; Metallic Powder; Rotating Electrode; RES; REP
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APA (6th Edition):
Thompson, C. 1. (2012). A Rotating Electrode System for the Generation of Metal Alloy Microspheres. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148295
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Thompson, Chad 1984-. “A Rotating Electrode System for the Generation of Metal Alloy Microspheres.” 2012. Thesis, Texas A&M University. Accessed March 19, 2019.
http://hdl.handle.net/1969.1/148295.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Thompson, Chad 1984-. “A Rotating Electrode System for the Generation of Metal Alloy Microspheres.” 2012. Web. 19 Mar 2019.
Vancouver:
Thompson C1. A Rotating Electrode System for the Generation of Metal Alloy Microspheres. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/1969.1/148295.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Thompson C1. A Rotating Electrode System for the Generation of Metal Alloy Microspheres. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148295
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Northeastern University
26.
Houshmand, Azin.
Phase evolution in Cu-Zn powder mixtures subjected to ultrasonic powder consolidation and ball milling.
Degree: MS, Department of Mechanical and Industrial Engineering, 2016, Northeastern University
URL: http://hdl.handle.net/2047/D20237651
► Ultrasonic powder consolidation (UPC) is a novel, low-temperature, rapid powder consolidation process, capable of producing full-density materials from powders in a few seconds.; The objective…
(more)
▼ Ultrasonic powder consolidation (UPC) is a novel, low-temperature, rapid powder consolidation process, capable of producing full-density materials from powders in a few seconds.; The objective of this work was to investigate the phase evolution in a Cu-Zn powder mixture subjected to UPC in comparison with that in other high-strain rate materials processing methods such as ball milling. Systematic UPC experiments were performed with a Cu-48 wt% Zn powder mixture at nominal consolidation temperatures of 25 °C to 300 °C, using 20 kHz, 9 µm-amplitude ultrasonic vibration applied to the powder compact for a duration of 1 to 4 s. Optical microscopy and X-ray diffraction revealed the formation of γ-brass at the interface of Cu and Zn powder particles in the samples consolidated at or above 200 °C. The γ-brass formation increased with increasing consolidation temperature and vibration time and approached 70 vol% in a sample consolidated at 300 °C for 4 s. No new phase formed in a reference sample made at 300 °C but with no vibration, despite the close contact between Cu and Zn achieved in the reference sample.; The γ-brass formation in the UPC samples is contrasted by the direct formation of β-brass in ball-milled composite powders of the Cu-48 wt% Zn composition. The phase selection in UPC is governed by the local state at the Cu-Zn interface. The high excess vacancies generated at the Cu-Zn interface enhance the interdiffusion at the Cu-Zn interface by many orders of magnitude, allowing the interfacial Cu and Zn concentrations to exceed the normal solubility limits before a new phase can nucleate. This, in turn, increases the driving force for the nucleation of γ-brass at the Cu-Zn interface. The driving for β-brass nucleation does not increase as much because of the large solubility of Zn in Cu.; Adding a pre-UPC step, such as a heat treatment or ball milling for a very short time (before any new phase formation is detectable), facilities β-brass nucleation which then grows in subsequent UPC. This shows the feasibility of β-brass production from elemental powders in a two-step UPC process.
Subjects/Keywords: ball milling; enhance diffusion; phase transformation; powder metallurgy; ultrasonic powder consolidation
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APA (6th Edition):
Houshmand, A. (2016). Phase evolution in Cu-Zn powder mixtures subjected to ultrasonic powder consolidation and ball milling. (Masters Thesis). Northeastern University. Retrieved from http://hdl.handle.net/2047/D20237651
Chicago Manual of Style (16th Edition):
Houshmand, Azin. “Phase evolution in Cu-Zn powder mixtures subjected to ultrasonic powder consolidation and ball milling.” 2016. Masters Thesis, Northeastern University. Accessed March 19, 2019.
http://hdl.handle.net/2047/D20237651.
MLA Handbook (7th Edition):
Houshmand, Azin. “Phase evolution in Cu-Zn powder mixtures subjected to ultrasonic powder consolidation and ball milling.” 2016. Web. 19 Mar 2019.
Vancouver:
Houshmand A. Phase evolution in Cu-Zn powder mixtures subjected to ultrasonic powder consolidation and ball milling. [Internet] [Masters thesis]. Northeastern University; 2016. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/2047/D20237651.
Council of Science Editors:
Houshmand A. Phase evolution in Cu-Zn powder mixtures subjected to ultrasonic powder consolidation and ball milling. [Masters Thesis]. Northeastern University; 2016. Available from: http://hdl.handle.net/2047/D20237651
University of Arizona
27.
Ibarra, Santiago, 1940-.
The effect of allotropic transformations on the sintering behavior of iron powder
.
Degree: 1965, University of Arizona
URL: http://hdl.handle.net/10150/347516
Subjects/Keywords: Iron powder.;
Sintering.;
Powder metallurgy.
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APA (6th Edition):
Ibarra, Santiago, 1. (1965). The effect of allotropic transformations on the sintering behavior of iron powder
. (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/347516
Chicago Manual of Style (16th Edition):
Ibarra, Santiago, 1940-. “The effect of allotropic transformations on the sintering behavior of iron powder
.” 1965. Masters Thesis, University of Arizona. Accessed March 19, 2019.
http://hdl.handle.net/10150/347516.
MLA Handbook (7th Edition):
Ibarra, Santiago, 1940-. “The effect of allotropic transformations on the sintering behavior of iron powder
.” 1965. Web. 19 Mar 2019.
Vancouver:
Ibarra, Santiago 1. The effect of allotropic transformations on the sintering behavior of iron powder
. [Internet] [Masters thesis]. University of Arizona; 1965. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/10150/347516.
Council of Science Editors:
Ibarra, Santiago 1. The effect of allotropic transformations on the sintering behavior of iron powder
. [Masters Thesis]. University of Arizona; 1965. Available from: http://hdl.handle.net/10150/347516
Stellenbosch University
28.
Scholtz, Arno Paul.
A Study of copper infiltration for conventional ferrous powder metallurgy.
Degree: MEng, Mechanical and Mechatronic Engineering, 2018, Stellenbosch University
URL: http://hdl.handle.net/10019.1/105089
► ENGLISH ABSTRACT: Powder metallurgy (PM) describes a group of manufacturing technologies whereby fine metallic powders are consolidated to create engineering components. The most widely used…
(more)
▼ ENGLISH ABSTRACT:
Powder metallurgy (PM) describes a group of manufacturing technologies whereby fine metallic powders are consolidated to create engineering
components. The most widely used PM technology is the press-and-sinter process, used to manufacture ferrous alloys. Ferrous PM is frequently
sinter-infiltrated with copper (Cu) in order to improve the materials machinability. During sinter-infiltration, molten copper infiltrates the inherently porous PM structure, filling the pores and creating a more dense,
less porous material. Residual Cu, from incomplete infiltration, is a common defect in copper infiltrated PM parts. This project investigates the
parameters of sinter-infiltration that are critical to successful infiltration and the production of high-quality Cu infiltrated ferrous PM alloys.
Common reasons for poor infiltration include incomplete delubrication prior to sintering, and inadequate furnace atmosphere and temperature control. Both
of these aspects can introduce impurities into the material during the sintering process, which inhibits efficient infiltration and sintering. This study focuses
specifically on the influence of delubrication and furnace control on the sinter-infiltrated material quality.
A proprietary copper-infiltrated ferrous PM alloy, with specified processing parameters, is used for this study. A systematic evaluation of both the delubrication and copper-infiltration processes is presented. In order to
perform this evaluation, it was necessary to implement control of the furnace temperature and atmosphere. As such, an extensive overhaul of the furnace at Stellenbosch University, with particular attention given to both the
electrical and process gas flow systems, was performed and the details are presented in this study.
The results of the study indicate that in order to successfully perform good quality sinter-infiltration of the proprietary alloy with copper, different process gas atmospheres are required in the furnace for the delubrication and
sintering steps, respectively. During delubrication, a reducing atmosphere of 80:20 vol% N2:H2 with a dewpoint of 8 °C must be maintained. During
sintering an atmosphere composition of 80:20 vol% N2:H2 must be maintained with a low dewpoint of -35 °C. For the cooling of the samples an atmosphere composition of 95:5 vol% N2:H2 was used.
Furthermore, a detailed metallographic analysis of the consecutive stages of copper infiltration, over the temperature range of 1070 to 1130 °C was
conducted. The results of which show how the interaction between Cu and Mn in the alloy significantly influences the melting and infiltration behaviour.
This research provides valuable insight into the high sensitivity of the copper infiltration process to furnace atmosphere control, as well as the advantage
of understanding the detailed interaction between different alloying elements in the PM material during copper infiltration. Insight leads to the ability to control the process and to design for good quality copper infiltration during
…
Advisors/Committee Members: Blaine, D. C., Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering..
Subjects/Keywords: Powder metallurgy; Ferrous alloys; Copper infiltration; Sinter (Metallurgy); UCTD
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Manager
APA (6th Edition):
Scholtz, A. P. (2018). A Study of copper infiltration for conventional ferrous powder metallurgy. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/105089
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Scholtz, Arno Paul. “A Study of copper infiltration for conventional ferrous powder metallurgy.” 2018. Thesis, Stellenbosch University. Accessed March 19, 2019.
http://hdl.handle.net/10019.1/105089.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Scholtz, Arno Paul. “A Study of copper infiltration for conventional ferrous powder metallurgy.” 2018. Web. 19 Mar 2019.
Vancouver:
Scholtz AP. A Study of copper infiltration for conventional ferrous powder metallurgy. [Internet] [Thesis]. Stellenbosch University; 2018. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/10019.1/105089.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Scholtz AP. A Study of copper infiltration for conventional ferrous powder metallurgy. [Thesis]. Stellenbosch University; 2018. Available from: http://hdl.handle.net/10019.1/105089
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Northeastern University
29.
Liu, Zheng.
Densification and metallurgical bonding in copper powder compact during ultrasonic powder consolidation.
Degree: 2016, Northeastern University
URL: http://hdl.handle.net/2047/D20200338
► Ultrasonic powder consolidation (UPC) is a novel, low-temperature, rapid powder consolidation process being investigated at the Advanced Materials Processing Laboratory (AMPL), in which a powder…
(more)
▼ Ultrasonic powder consolidation (UPC) is a novel, low-temperature, rapid powder consolidation process being investigated at the Advanced Materials Processing Laboratory (AMPL), in which a powder compact to be consolidated is pressed under a uniaxial force, heated to a moderately low temperature (normally, < 0.5 Tm), and subjected to ultrasonic vibration for only a few seconds to create full-density, metallurgical bonded bulk materials. In the present study, UPC experiments were performed with a water-atomized copper powder to investigate the progress of powder compact densification and metallurgical bonding under systematically varied consolidation parameters: temperature and time. The extent of powder compact densification was determined on as-polished cross sections of consolidated specimens. The metallurgical bonding in the powder compacts was assessed on polished specimen surfaces subjected to an ultrasonic washing test, also developed at AMPL, in which a polished specimen surface is subjected to ultrasonic waves in water to remove powder particles that are not bonded well.; Image analysis on photomicrographs of as-polished and ultrasonically washed powder compacts showed that both compact densification and particle bonding increased with increasing consolidation temperature and time and that the metallurgical bonding lagged behind the compact densification. At a nominal consolidation temperature of 500 °C, full densification was achieved in 3 s, whereas 4 s were needed to achieve good metallurgical bonding. Delays of metallurgical bonding to similar degrees were observed at the consolidation temperatures of 300 - 600 °C that were investigated, suggesting that UPC is a 2-step process of compact densification followed by metallurgical bonding.; Compact densification progressed as the inter-particle regions were filled with 'debris' from parent particles that rubbed against each other under the applied ultrasonic vibration. Energy-dispersive X-ray spectroscopy (EDS) revealed that the debris-filled inter-particle regions consisted of copper and a very small amount of oxygen, indicating that the debris did come from the parent copper particles. The debris had ragged interfaces with their parent particles and contained nano-sized voids. Local melting at the particle surface, possibly by strain-induced melting point depression, might produce bits of liquid that solidified into the debris.; The debris-filled inter-particle regions decreased with increasing consolidation temperature and/or time as they became integral parts of the consolidated material. Full metallurgical bonding was attained when the debris-filled inter-particle regions were completely transformed to well-defined grains by recrystallization and coarsening under imposed ultrasonic vibration. The extra time required for the transformation of the inter-particle debris to the well-defined grains accounts for the lag of the metallurgical bonding behind the compact densification.
Subjects/Keywords: densification; metallurgical bonding; Copper powder; Metallurgy; Copper; Metallurgy; Powder metallurgy; Ultrasonic welding; Ultrasonic waves; Industrial applications; Industrial applications
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APA ·
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Manager
APA (6th Edition):
Liu, Z. (2016). Densification and metallurgical bonding in copper powder compact during ultrasonic powder consolidation. (Masters Thesis). Northeastern University. Retrieved from http://hdl.handle.net/2047/D20200338
Chicago Manual of Style (16th Edition):
Liu, Zheng. “Densification and metallurgical bonding in copper powder compact during ultrasonic powder consolidation.” 2016. Masters Thesis, Northeastern University. Accessed March 19, 2019.
http://hdl.handle.net/2047/D20200338.
MLA Handbook (7th Edition):
Liu, Zheng. “Densification and metallurgical bonding in copper powder compact during ultrasonic powder consolidation.” 2016. Web. 19 Mar 2019.
Vancouver:
Liu Z. Densification and metallurgical bonding in copper powder compact during ultrasonic powder consolidation. [Internet] [Masters thesis]. Northeastern University; 2016. [cited 2019 Mar 19].
Available from: http://hdl.handle.net/2047/D20200338.
Council of Science Editors:
Liu Z. Densification and metallurgical bonding in copper powder compact during ultrasonic powder consolidation. [Masters Thesis]. Northeastern University; 2016. Available from: http://hdl.handle.net/2047/D20200338
University of New South Wales
30.
Yao, Yin.
Fabrication and Properties of Aluminium Matrix Composite Reinforced with High Volume Fraction Silicon Carbide Particles.
Degree: Materials Science & Engineering, 2016, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/57917
► This thesis details the investigation relating to the production method and mechanical properties of two types of aluminium/silicon carbide composites. These materials are manufactured using…
(more)
▼ This thesis details the investigation relating to the production method and mechanical properties of two types of aluminium/silicon carbide composites. These materials are manufactured using specialised
powder metallurgy (P/M) techniques, which includes mixing/milling,
powder compaction, sintering and hot extrusion. The first type of composite utilises pure aluminium as the matrix, whilst the other type uses matrix consist of aluminium and in-situ oxide particles, namely sintered aluminium
powder (SAP). The second type of composite combines silicon carbon particles with very small in-situ oxide particulates inside the aluminium matrix, creating a dual reinforcement system. These composites are not often characterised in literature as the fabrication process is very challenging, particularly using P/M methods. Therefore, this work offers rare insight into aluminium composites with a combination of different size reinforcement particles, which is important in establishing more novel aluminium based composites.Composites with nearly full density (> 99% theoretical density) were successfully produced via this method. The unreinforced aluminium specimens were relatively easy to extrude and defect-free extrusions can be produced in a range of parameters. The composite material not only required a higher extrusion load, but also produced a small amount of surface defects resulting sub-optimal surface finishing. A suitable remedy is to use aluminium foil or an aluminium disc in front of the extrusion for the composite material. The foil or disc acts a solid lubricant for the hard composite material, which significantly improves the surface finishing. Using this method, crack free extrusions can be obtained at reinforcement contents up to 30 volume percent silicon carbide.Microstructural analysis using optical and electron microscopies shows the particle dispersion in the material is relative homogenous. However, particle banding and alignment are observed along the extrusion direction of the specimens. Transmission electron microscope analysis shows the particle/matrix interface is free of any major reaction, but a small layer of inter-diffusion occurred between silicon and aluminium. The sub-structure of the material adjacent to the silicon carbide particle is observed to be sub-micron. This can be related to particle –assisted nucleation during extrusion and possibly the effect of high dislocation density near the particle-matrix interface, which produces a very fine structure. Mechanical testing showed the composite reinforced with silicon carbide (1200 mesh, 13 micron) possessed a significant improvement in mechanical strength and stiffness as compared to the unreinforced material. The improvement did not diminish with increasing in reinforcement volume fraction, but follows a linear trend. This increase is related to the load transfer from the matrix to the reinforcement, the generation of thermal dislocations (which is related to the difference in co-efficient of thermal expansion between the matrix and reinforcement…
Advisors/Committee Members: Chan, Sammy, Materials Science & Engineering, Faculty of Science, UNSW, Standard, Owen, Materials Science & Engineering, Faculty of Science, UNSW.
Subjects/Keywords: Extrusion aluminium powder; Aluminium SiC composite; Aluminium Powder Metallurgy; Mechanical properties aluminium
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APA (6th Edition):
Yao, Y. (2016). Fabrication and Properties of Aluminium Matrix Composite Reinforced with High Volume Fraction Silicon Carbide Particles. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/57917
Chicago Manual of Style (16th Edition):
Yao, Yin. “Fabrication and Properties of Aluminium Matrix Composite Reinforced with High Volume Fraction Silicon Carbide Particles.” 2016. Doctoral Dissertation, University of New South Wales. Accessed March 19, 2019.
http://handle.unsw.edu.au/1959.4/57917.
MLA Handbook (7th Edition):
Yao, Yin. “Fabrication and Properties of Aluminium Matrix Composite Reinforced with High Volume Fraction Silicon Carbide Particles.” 2016. Web. 19 Mar 2019.
Vancouver:
Yao Y. Fabrication and Properties of Aluminium Matrix Composite Reinforced with High Volume Fraction Silicon Carbide Particles. [Internet] [Doctoral dissertation]. University of New South Wales; 2016. [cited 2019 Mar 19].
Available from: http://handle.unsw.edu.au/1959.4/57917.
Council of Science Editors:
Yao Y. Fabrication and Properties of Aluminium Matrix Composite Reinforced with High Volume Fraction Silicon Carbide Particles. [Doctoral Dissertation]. University of New South Wales; 2016. Available from: http://handle.unsw.edu.au/1959.4/57917
◁ [1] [2] [3] [4] [5] [6] [7] [8] ▶
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Open Access Theses and Dissertations
