Basal 〈a〉 dislocation-{[formula omitted]} contraction twin interactions in magnesium.

Graphical abstract Highlights • Basal 〈a〉 dislocation-{ 1 ¯ 0 1 1 } twin interactions are studied in magnesium. • A stacking fault forms on the pyramidal plane due to the dislocation-TB interactions. • When a dislocation enters the lateral side of the twin, de-twinning occurs. Abstract Basal 〈a〉 dislocation-{ 1 ¯ 0 1 1 } contraction twin interactions are studied in magnesium using molecular dynamics simulations. It is shown that when a basal 〈a〉 dislocation interacts with a ( 1 ¯ 0 1 1) twin boundary, a stacking fault forms along the (1 0 1 ¯ 1) plane because the basal plane of the matrix is nearly parallel to the pyramidal plane of the twin with a deviation of 5.7°. After the second lattice dislocation enters the boundary, the faulted region is erased due to dislocation slip and atomic shuffle. Furthermore, when a basal 〈a〉 dislocation moves toward the lateral side of the twin, de-twinning occurs through a pure-shuffle mechanism. [ABSTRACT FROM AUTHOR]