Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 10 of 10 for “"ultrafine-grained"”.
-
Stress corrosion cracking behavior of friction stir processed ultrafine grained light metal alloys
… and power law type behavior was proposed. Ultrafine fine grained (UFG) microstructure showed one order magnitude lower corrosion rate.</p> <p>Grain refinement achieved through different FSP parameters showed lower corrosion currents for Al-Mg alloy as compared to the base alloy. The …
-
Excess thermodynamic properties and size-dependent segregation phenomena in ultrafine-grained titanium dioxide
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1993.
-
Synthesis, microstructure and mechanical properties of bulk ultrafine grained Ti-47Al-2Cr (at%) alloy
… (at%) have been carried out to synthesize bulk ultrafine grained Ti-47Al-2Cr alloy. The Ti/Al/Cr composite powders were produced using high energy mechanical milling of elemental Ti, Al, Cr powders in a retsch planetary mill. The microstructure and mechanical properties of the bulk consolidated …
-
Microstructural Heterogeneity and the Mechanical Behavior of Nanocrystalline Metals
… microstructural heterogeneity and size in ultrafine grained and nanocrystalline metals leads to unusual mechanical behavior. In the first part of the study, we have shown that (a) nanocrystalline metals, unlike their coarse grained counterparts, recover a substantial fraction (50 to 100%) …
-
Investigating the Effect of Austenite Grain Size and Grain Boundary Character on Deformation Twinning Behavior in A High-Manganese TWIP Steel: A TEM In-Situ Deformation Study
… relationship and generally appears in most ultrafine-grained metals. The ultrafine-grained (UFG) high manganese austenitic twinning-induced plasticity (TWIP) steels have been found to overcome the strength-ductility trade-off but their underlying mechanism of discontinuous yielding behavior …
-
Microstructure, Thermal Stability and Consolidation of Nanostructured and Ultrafine Structured Cu based Metal Matrix Composite and Alloy Powders Produced by High Energy Mechanical Milling
Ultrafine grained and/or nanostructured Cu and Cu-(2.5-10)vol.%Al2O3 composite balls/granules/powder particles were produced using two high energy mechanical milling (HEMM) routes respectively. The microstructural evolution of the as-milled Cu and Cu-Al2O3 composite balls/granules/powder particles …
-
Characterizing Plastic Deformation Mechanisms in Metal Thin Films using In Situ Transmission Electron Microscopy Nanomechanics
… systems (MEMS). Nanocrystalline (NC) and ultrafine-grained (UFG) metal thin films show increased strength when compared to their coarse-grained equivalents, and as a result, have been proposed as viable solutions to high-strength MEMS materials. The increased yield strength is generally …
-
Thermal Stability, Microstructures and Mechanical Properties of Nanostructured/Ultrafine Structured Cu-5vol.%Al₂O₃ Nanocomposites Fabricated by High Energy Mechanical Milling and Powder Compact Extrusion
Ultrafine structured metal matrix nanocomposites (MMNCs) have received much attention due to their attractive engineering applications and scientific interest. On the engineering aspect, ultrafine structured MMNCs have a higher room temperature strength and better high temperature performance due …
-
Ermüdungs- und Rissfortschrittsverhalten ausscheidungshärtbarer ultrafeinkörniger Aluminiumlegierungen
Ultrafeinkörnige metallische Werkstoffe haben verstärkt wissenschaftliche Bedeutung erlangt. Um dieser neuartigen Werkstoffklasse über die grundlagenorientierte Forschung hinaus einen Einsatz in technischen Anwendungen zu ermöglichen, ist es notwendig, deren Verhalten unter verschiedenen …