Correlation Among Stress State, Plastic Mechanism, and Texture Evolution for Magnesium Alloy Sheet: Analysis with Effective Schmid Factor

In real industrial process for metallic materials, complex stress states are usually involved with variations in texture features. Especially for Mg, Zr, Ti alloys with diverse slip systems and twinning modes, their texture evolution behavior are still unclear owing to the insufficient understanding of the relation between complex stress state and activation of plastic mode. In this paper, the effective Schmid factor (ESF) recently proposed by us is used to clarify the correlation among stress state, plastic mechanism, and texture evolution. With ESF calculation, the contribution of each stress component in complex stress state is reasonably considered with special good description ability for shear stress. Firstly, the intrinsic reason for the texture weakness for magnesium alloy sheet during differential speed rolling (DSR) are clarified with ESF calculation. It indicates that the shear deformation induced during DSR can change the stable position of basal  slip, and thus result in tilted basal texture. Besides, high activity of contraction twinning and pyramidal  slip can promote the dynamic recrystallization and further weaken the basal texture.