Interactions between kinking and {1012} twinning in a Mg-Zn-Gd alloy containing long period stacking ordered (LPSO) phase

摘要

Two interaction modes between kinking and {10 (1) over bar2} twinning in a Mg-Zn-Gd alloy containing long period stacking ordered (LPSO) phase are thoroughly investigated: (i) when kinking forms prior to twinning, twins concomitantly nuclear at kink boundaries (KBs) and twinning propagation is frequently restricted by two adjacent KBs. By contrast, (ii) when twinning forms prior to kinking, kink deformation locally breaks the twins' theoretical misorientation to their adjacent matrixes, during which basal slip plays a vital role in accommodating the asynchronous deformation between kinking and twinning.