Modeling Anisotropic Stress-Strain Response and Crystallographic Texture Evolution in alpha-Titanium during Large Plastic Deformation using Taylor-Type Models: Influence of Initial Texture and Purity

The anisotropic strain-hardening behavior and texture evolution during large plastic strains were investigated in two different grades of alpha-titanium. A recently proposed Taylor-type crystal-plasticity model([1]) was used to predict the crystallographic texture evolution and anisotropic stress-strain response of these materials during large plastic strains at ambient temperature. The reasonable agreement between the predictions and the measurements reported here demonstrates the potential of these models for a class of titanium alloys in which plastic deformation is accommodated by both crystallographic slip and deformation twinning. The results of this study also provided quantitative insights into the effects of purity level on the slip and twin-hardening parameters, which are also observed to be relatively insensitive to the initial texture in the sample.