集合組織を持つTi合金多結晶材料の変形に関する結晶塑性有限要素解析

抄録

Plastic slip deformation in textured α phase Ti alloy polycrystal models is studied by a crystal plasticity finite element analysis. Models consist of 57 crystal grains and their crystal orientations are defined in accordance to existing experimental data. Crystal orientation of the texture is called TD-split type where the normal to the basal plane inclines about +/- 40 degree from ND toward TD. Critical resolved shear stress for prismatic slip systems is the lowest and that for basal systems is slightly higher than that for the prismatic ones. Results show that slip deformation is highly non-uniform at the deformation stage of macroscopic yielding point and two prismatic systems operate depending on the inclination of + or - 40 degree to TD. After some amount of deformation, activation of slip systems multiply in crystal grains.