Mechanical Properties of Nanostructured Metals

Abstract

PolycrystalsThis section is divided into four subsections. The subsection on synthesis and structure treats electrodeposition, severe plastic deformation, and mechanical alloying. It highlights features that affect mechanical properties such as texture, grain size and shape, internal stress, twinning, dislocations, and point defects. The mechanical properties subsection contrasts yield strength, ductility, strain hardening, strain-rate sensitivity, creep, and fatigue in conventional versus nanocrystalline metals. Underlying deformation mechanisms are then discussed in terms of deformation-mechanism maps and intragranular slip versus grain-boundarymediated regimes. Finally, modeling and simulation approaches are presented in terms of atomistic versus continuum methods.

Stable microstructure in a nanocrystalline copper–tantalum alloy during shock loading

“…any future applications that aim to harness, avoid, or mitigate the collision of shock waves with condensed matter (and the extreme pressures/temperatures that result) are yet to be realized, primarily due to the lack of new advanced structural materials. Central to this predicament is the discovery of materials, which must preserve their microstructural integrity under intense loading and temperature [1][2][3][4][5] . Therefore, it is imperative to understand factors that alter the sub-features, which control both structural and functional properties, in particularly under conditions of shock physics that represent one of the most extreme environments where virtually every polycrystalline structural materials' microstructure breaks-down (significant changes) 1 .…”