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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"severe plastic deformation"”.
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Mechanical Behavior of Magnesium Experienced Severe Plastic Deformation
… of 11.2 μm. The hardness was higher with more severe deformation, more passes, and lower pressing temperature, which has been increased more than 20% from 7.5HV right after pressing.
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Strain hardening of titanium by severe plastic deformation.
Massachusetts Institute of Technology. Dept. of Metallurgy and Materials Science. Thesis. 1973. Sc.D.
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Processing of aluminium and titanium alloys by severe plastic deformation
Severe plastic deformation (SPD) techniques are applied to polycrystalline materials to significantly refine their grain sizes which lead normally to an enhancement of the material properties. Equal-channel angular pressing (ECAP) and high pressure torsion (HPT) were considered as very important …
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Severe plastic deformation in highly immiscible copper alloys: self-organization
Severe plastic deformation (SPD) techniques such as equal channel angular pressing (ECAP), high pressure torsion (HPT), high energy ball milling (BM), accumulative roll bonding (ARB), are well known to refine the microstructures of metals and alloys into non-equilibrium states with nanometer-size …
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Improving mechanical properties of a magnesium alloy by severe plastic deformation
… show a relation between the grain size and the deformation mechanisms occurring in the alloy. It was found that mechanical properties of AZ31B can be tailored to a specific application by using different process parameters. It was shown that yield strength can be increased from 165 MPa to 290 …
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Self-organization in immiscible alloy systems under irradiation and severe plastic deformation
… reactors to alloys being processed through severe plastic deformation. In each of these cases, there exists external dynamical forcing which keeps the material in non-equilibrium conditions. In the case of structural materials in a nuclear reactor environment, there are high fluxes of …
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Molecular Dynamics Study of Microstructural Evolution in Alloys Subjected to Severe Plastic Deformation
The atomic transport resulting from plastic deformation has been analyzed in new depths by tracking the evolution of pair of marker atoms. This analysis has proved to be a powerful tool in identifying the deformation mechanisms, including the glide of leading and trailing partial dislocations, and …
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Shear induced mixing and self-organization in immiscible alloys during severe plastic deformation
Metals and alloys processed by severe plastic deformation (SPD) techniques are gaining widespread interest for applications where bulk nanostructured materials are desired. This dissertation research focuses on understanding the underlying mechanisms and evolution of the microstructure in Cu-Ag, an …
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Role of interfaces on severe plastic deformation and He-irradiation tolerance in Cu-Nb nanocomposites
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-07-07 without embargo terms
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Microstructural evolution and phase stability of Cu/Nb nanolaminates subjected to severe plastic deformation by high pressure torsion
… interactions with dislocations and defects. Severe plastic deformation has become one of the most promising techniques for producing nanostructured materials in large amounts, and, in some cases, in the bulk shape. This dissertation focuses on providing a better understanding of deformation …
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Nanostructured alloys for extreme conditions
… and (iii) the processing of these materials by severe plastic deformation. The work was a combination of both experimental and computational investigations.
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Development and characterization of nanostructured steels and high entropy alloys for nuclear applications
… manufacturing of current commercial alloys using severe plastic deformation (SPD) and the development of new advanced high entropy alloys (HEAs).</p> <p>Because SPD is effective at achieving grain refinement, this technique was used to obtain material having a high volume fraction of grain …
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Wear at high sliding speeds and high contact pressures
… the slider wear. Three distinct wear regions, plasticity dominated, severe plastic deformation and melt lubrication were observed. Test results provided evidence that the aluminum slider contact interface was molten. Modeling of the experimental wear data showed a dependence on pressure and …
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Optimization of modular die design in extrusion process
… extrusion, the hot aluminum billet goes under severe plastic deformation as it is forced to flow through a smaller die cavity that defines the final shape of the extruding product. Surface finish and dimensional accuracy are the two most important criteria that specify the productivity and …
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Structure-property relationships in an Al matrix Ca nanofilamentary composite conductor with potential application in high-voltage power transmission
… composite was produced by powder metallurgy and severe plastic deformation by extrusion and swaging. The fine Ca metal powders have been produced by centrifugal atomization with rotating liquid oil quench bath, and a detailed study about the atomization process and powder characteristics has been …
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Microstructural alterations in bearing steels under rolling contact fatigue
… other scenarios with similar phenomena such as severe plastic deformation and hydrogen embrittlement.
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Additive Friction Stir Deposition of Aerospace Al-Zn-Mg-Cu-Zr Alloys: Leveraging Processing and Metallurgical Science for Structural Repair
… additive manufacturing process that leverages severe plastic deformation to deposit fully dense metallic parts. This is of particular interest for high-strength aluminum alloys in which the addition of copper to the alloy chemistry makes them susceptible to hot cracking. This plagues …
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Effects of high shear deformation from equal channel angular pressing-conform and post thermal mechanical processing on the microstructural and mechanical properties of titanium alloys
… was to develop a better understanding of the severe plastic deformation processing and properties of titanium alloys subject to equal channel angular pressing-conform (ECAP-C) and post thermal mechanical processing (TMP). The ECAP-C process uses high-shear deformation to refine the …
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Dynamic and Post-Dynamic Microstructure Evolution in Additive Friction Stir Deposition
… techniques bypass these flaws, using deformation and diffusion phenomena to bond material together layer by layer. Among these techniques, Additive Friction Stir Deposition (AFSD), stands out as unique for its freeform nature, and thermomechanical conditions during material processing. …
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