Interaction between migrating (10 <(1)over bar > 2) twin boundary and extended < a > dislocations inside twin in pure Mg

Y Yue and J Nie, SCRIPTA MATERIALIA, 218, 114842 (2022).

DOI: 10.1016/j.scriptamat.2022.114842

Interaction between a matrix prismatic < c > edge dislocation and a migrating (10 <(1)over bar > 2) twin boundary results in extended basal < a > mixed dislocations in the twin lattice. The interaction between the resultant < a > dislocation and the migrating twin boundary is studied using molecular dynamics simulations. The < a > dislocation tends to detach from or connect to the twin boundary, when its slip plane intersects a compression or extension site of the twin boundary. When the < a > dislocation connects to the twin boundary, connection always occurs with a 90 Shockley partial and a basal-prismatic (BP) or prismatic-basal (PB) two-atomic-layer-height step, depending on whether the Burgers vector direction of the Shockley partial points away from or towards the twin boundary. The BP or PB two-atomic-layer-height step is sessile, in contrast to those that are not connected to such < a > dislocation.

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