OS0109-168 Crystal plasticity finite element analysis of slip deformation and dislocation accumulation in polycrystal models of Ti-6Al-4V alloy

Abstract

Plastic slip deformation in α phase grains of Ti-6Al-4V alloy polycrystal models is studied by a crystal plasticity finite element analysis. Models consist of 30 crystal grains and their crystal orientations are given randomly. Critical resolved shear stress for prismatic slip systems is the lowest and that for basal systems is slightly higher than that for the prismatic systems. Results show that slip deformation is highly non-uniform at the deformation stage of macroscopic yielding point and not only prismatic but also basal systems operate in a small number of crystal grains in the model, while no slip deformation occurs in other grains.