Plastic anisotropy of multi-pass caliber-rolled Mg alloy with split texture distribution

Abstract

Multi-pass caliber-rolled Mg alloys possess a unique basal texture with split basal poles that are in contrast to alloys subjected to other plastic deformation processes. The intrinsic nature of texture development allows anisotropic material properties, which are elucidated in this study. Caliber-rolled Mg alloys were compressed along the rolling, transverse, and normal directions, to cause plastic anisotropy. These alloys presented distinct differences in compressive flow behaviors, deformation modes, and twinning characteristics (in terms of fraction, active variant, and propagation). The basal slip isotropically accommodated compressive deformation, whereas the {10–12} extension twinning and prismatic slip exhibited selective activation depending on the loading vector. Such disparities were interpreted in terms of the Schmid factor, in-grain misorientation axes analysis, and geometrical compatibility parameter.