{10(1)over-bar2} Twinning Behavior in Magnesium Single Crystal

In order to investigate tensile twinning behavior, the magnesium single crystal was deformed by compressing along the direction at room temperature, as tensile twinning easily takes place when the compression direction is perpendicular to the c-axis. Numerous primary tensile twins were activated during deformation, and the Schmid factor (SF) criterion was applied to the six twin variants. The analysis shows that the majority of the primary twins belong to high SF variants, and high SF twin boundaries provided nucleation sites for low SF variants. The secondary tensile twins were formed inside the high SF of wide primary twin bands, and the basal plane of the secondary twin was tilted about 60A degrees with respect to the original parent matrix. In the case of the secondary tensile twin, relatively low SF variants were activated while counterparts with higher SF variants were absent.