On Modeling the Mechanical Behavior and Texture Evolution of Rolled AZ31 Mg for Complex Loadings Involving Strain Path Changes

Abstract

An accurate description of the deformation response of AZ31 Mg under changing strain paths requires consideration of its strong anisotropy and its evolution with accumulated plastic deformation. The general held belief is that without modeling de-twining it is impossible to describe the effect of the pre-strain on hardening behavior in low cycle compression-tension-compression and tension-compression-tension tests, respectively. In this paper, it is shown that using the viscoplastic self-consistent crystal plasticity model in conjunction with the pre-dominant twinning reorientation (PTR) scheme it is possible to accurately model the reorientation of the microstructure for such complex loadings. Comparison with recent data reported by Hama et al. [1, 2] shows that the stress-strain response is also very well predicted.