Interaction between {10(1)over-bar2} and {30(3)over-bar4} twin in magnesium alloy

The dislocation-twin and twin-twin interaction play a crucial role as they impact morphology and distribution of twin interfaces, and ultimately influence mechanical properties for magnesium alloy. Herein, we investigate {10 (1) over bar2} twin-{30 (3) over bar4} twin interaction and evolution of interfaces, depending on crystallographic analysis and high-resolution transmission electron microscopy observations. It was found that incoming {30 (3) over bar4} twin could entirely cut through {10 (1) over bar2} twin. The {30 (3) over bar4} twin boundary was composed of {0002}parallel to{10 (1) over bar1} and {(1) over bar 01 (1) over bar}parallel to{0002} boundaries, while the {10 (1) over bar2} twin boundary was decorated by basal-prismatic boundaries at the interaction site. The point of twin intersection triggered new {10 (1) over bar3} twin nucleation. Further, the {10 (1) over bar2} twin-{30 (3) over bar4} twin interaction led to a low-angle asymmetrical tilt boundary, while the {10 (1) over bar2} twin-{10 (1) over bar3} twin interaction resulted in a high-angle asymmetrical tilt boundary. These correlations are expected to provide an insight into understanding the twinning behavior and the relationship between twin interfaces and {10 (1) over bar2} twin-{30 (3) over bar4} twin interaction in magnesium alloy. [GRAPHICS] .

Automated summary

This study investigates the interaction and evolution of {10 (1) over bar2} twinning with {30 (3) over bar4} twin in magnesium alloy through crystallographic analysis and high-resolution transmission electron microscopy observations. It was found that {30 (3) over bar4} twin can completely cut through {10 (1) over bar2} twin and triggers the formation of new {10 (1) over bar3} twin.