S.R. Agnew

Application of texture simulation to understanding mechanical behavior of Mg and solid solution alloys containing Li or Y

Abstract The viscoplastic self-consistent model was used to interpret differences in the mechanical behavior of hexagonal close packed magnesium alloys. There are only subtle differences in the compression textures of magnesium and its solid solution alloys containing lithium or yttrium. However, the plane strain compression textures of the alloys showed an increasing tendency for the basal poles to rotate away from the “normal direction” towards the “rolling direction”. Texture simulations enabled these distinctions to be attributed to the increased activity of the non-basal 〈 c + a 〉 slip mode. The alloys had improved compressive ductilities compared to pure magnesium, and the increased c + a slip mode activity provides a satisfying explanation for this improvement, since it can accommodate c-axis compression within individual grains. Accounting for individual deformation mode hardening enabled the flow curves to be simulated and the anisotropic plastic response of textured wrought alloys to be mechanistically understood and predicted.

Study of slip mechanisms in a magnesium alloy by neutron diffraction and modeling

Abstract Internal strains within a polycrystalline magnesium alloy plate have been measured during tensile and compression testing in situ by neutron diffraction. Using an elasto-plastic self-consistent simulation code, information about the operation of slip and mechanical twinning modes as a function of strain has been obtained.

Transmission electron microscopy investigation of 〈c+a〉 dislocations in Mg and α-solid solution Mg-Li alloys

AbstractThe ductility of Mg alloys is limited due to a shortage of independent slip systems. In particular, c-axis compression cannot be accommodated by any of the easy slip or twinning modes. Basal-textured samples of pure Mg and Mg-15 at. pct Li were examined for the presence of 〈c+a〉 dislocations by post-mortem transmission electron microscopy (TEM) after a small deformation, which forced the majority of grains to compress nearly parallel to their c-axes. A higher density and more uniform distribution of 〈c+a〉 dislocations is found in the Li-containing alloy. Because the 1/3〈11

Microstructure and mechanical behavior of nanocrystalline metals

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The influence of texture on the elastic properties of ultrafine-grain copper

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The Role of Texture, Temperature and Strain Rate in the Activity of Deformation Twinning

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