Interaction between migrating (1012) twin boundary and extended〈a〉dislocations inside twin in pure Mg

Yuan Yue, Jian Nie

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Interaction between a matrix prismatic 〈 c 〉 edge dislocation and a migrating 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.
Original languageEnglish
Article number114842
Number of pages6
JournalScripta Materialia
Publication statusPublished - Sept 2022

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