Interfacial structure of {101‾2} twin tip in deformed magnesium alloy

A typical {101¯2} twin tip, which contains straight {101¯2} twinning planes and basal–prismatic interfaces, is characterized in deformed Mg–3% Al–1% Zn alloy by transmission electron microscopy (TEM) and high-resolution TEM. The existence of basal–prismatic interfaces is responsible for the deviation of the actual {101¯2} twinning boundary in the vicinity of the twin tip from the theoretical one. The process of twinning dislocation gliding around the twin tip boundary is described.