In order to understand the origin of the anomalous twinning of the {10•2} type, rolled sheets of AZ31 Mg alloy were deformed at room temperature in tension along the rolling direction. An excellent correlation was found between {10•2} twinning tendency and basal dislocation slip activity. Calculation of strain tensor indicated that the diagonal strain components associated with the localized basal slip could be cancelled completely by the {10•2} twinning. The results led to the conclusion that anomalous {10•2} twins were formed to accommodate the strain incompatibility caused by localized basal dislocation slip.

Origin of the Anomalous {10¯12} Twinning during Tensile Deformation of Mg Alloy Sheet. J.Koike, Y.Sato, D.Ando: Materials Transactions, 2008, 49[12], 2792-800