{10−12} twinning behavior in magnesium bicrystal

Abstract

Uniaxial stretching was performed on magnesium bicrystal structure consisting of two single crystals and a grain boundary. The {10−12} twinning behavior and twin variant selection were investigated by electron backscatter diffraction (EBSD). The mechanism of the twin variant selection was discussed by taking account of the combination effect of Schmid factor (SF) and local strain accommodation factor (m′). The results indicated that the local strain accommodation factor m′ can be provided to testify the strain accommodation in such a specific structure with a grain boundary between two single crystals. These results revealed that the twin variants with higher m′ values are inclined to be activated not only in the adjacent grains across the grain boundary but also in a single crystal.