Effect of deformation mode on double-peak texture evolution in pre-twinning Mg-3Al-1Zn alloy during high-speed impacting loading

Abstract

An investigation of the quantitative effect of the deformation process on the deformation mode, texture evolution, and their internal relationship could help control the mechanical properties of targeted materials. In this study, the deformation mechanism and texture evolution of pre-twinning AZ31 magnesium alloy under medium temperature with high-speed impact loading are investigated through electron backscattered diffraction and the coupled simulation of the finite element method and viscoplastic self-consistent models. Basal and < c + a > pyramidal slips are the dominant accommodation modes. The activation of nonbasal slip is promoted, and the number of twins increase with an increase in the impact pressure, leading to a decrease in the relative activity of the basal slip. Based on typical grain rotation statistics, the effects of basal slip, pyramidal <c + a> slip, and extension twins on grain rotation are studied. With an increase in the pressure, the relative activity difference between the basal slip and pyramidal <c + a> glide decreases, which is beneficial for the formation of a double-peak basal texture and the enhancement of the intensity of the double-peak texture. The twin density affects the split angle between the double peaks.