Near grain boundary behavior of aluminum bicrystals deformed in plane strain conditions

摘要

The paper describes the mechanism of deformation at 77 K of pure aluminum bicrystals of different grain orientations. The following orientations were selected: {100}＜001＞/{110}＜001＞ (cube/Goss) and - {100}＜001＞/{100}＜011＞ (cube/shear) to represent unstable vs. stable and unstable vs. unstable behaviors, respectively. The bicrystalline samples were deformed in the plane strain conditions with use of a channel-die immersed in a reservoir with liquid nitrogen. In both sets of crystallite compositions, the grain boundary was situated perpendicular to the compression plane. A particular interest was paid to the analysis of the crystal lattice rotations tendencies near the grain boundary and the description of the deformation behavior of the material in the macro- scale (hardening behavior). The experimental results of the local orientation measurements were used to evaluate the accuracy of the prediction of Crystal Plasticity Model of the macro-scale behavior of bicrystalline samples.