Interactions between dislocations and three-dimensional annealing twins in face centered cubic metals

Abstract

Annealing twins often form in metals with a face centered cubic structure during thermal and mechanical processing. Here, we conducted molecular dynamic (MD) simulations for copper and aluminum to study the interaction processes between {111}1/2<110> dislocations and a three-dimensional annealing twin. Twin boundaries are characterized with Σ3{111} coherent twin boundaries (CTBs) and Σ3{112} incoherent twin boundaries (ITBs). MD results revealed that dislocation-ITB interactions affect slip transmission for a dislocation crossing CTBs, facilitating the nucleation of Lomer dislocation.