Effect of Twin Boundary-Dislocation-Solute Interaction on Detwinning in a Mg-3Al-1Zn Alloy

In the present study, the influence of solute atoms together with dislocations at {101¯2} twin boundary (TB) on mechanical behavior of a detwinning predominant deformation in a Mg alloy AZ31 plate was systematically studied. The results show that a large number of {101¯2} twins disappear during recompression along the normal direction. Both the TB-dislocation interaction and TB-solute-dislocation interaction can greatly enhance the yield stress of the recompression along the normal direction (ND). However, the solute segregation at {101¯2} TBs with an intensive interaction with dislocations cannot further enhance the yield stress of ND recompression. The samples with TB-dislocation interaction show a similar working hardening performance with that subjected to a TB-solute-dislocation interaction. Both the TB-dislocation interaction and TB-solute-dislocation interaction greatly reduce the value of work hardening peaks during a detwinning predominant deformation.