Stability of twins in Mg alloys – A short review

In this article, the stability of twins, especially {10–12} twins, in Mg alloys was critically reviewed. In the last decade, pre-twinning is considered to be an effective method for adjusting the microstructure and properties of wrought Mg alloys. Especially, formation of twin-texture can remarkably improve formability of rolled Mg alloys. However, the stability of {10–12} twins determines the effect of this method. Previous work revealed that initial {10–12} twins may either grow or shrink under further deformation, and may be removed by static recrystallization under thermal effect. It is considered that improving the stability of twin structure could enhance the contribution of twin-texture on subsequent plastic formability. Based on this background, stress stability and thermal stability of {10–12} twin structure were summarized and reviewed in this article. Finally, a few critical scientific problems in this research field were pointed out.