Core-level Interaction between Edge/Screw Dislocation and Misfit Dislocation: A Molecular Dynamics Study

Abstract

We have investigated the interaction between dislocation cores of misfit dislocation on a semi-coherent interface and edge/screw dislocations gliding in a mono-lattice, by using molecular dynamics simulations. Edge dislocations, of which extra plane lies on the same side of that of misfit dislocation (same sign), bring about new dislocations from orthogonal line of misfit dislocation network to the cross-slip plane, keeping its Burgers vectors. Edge dislocations with opposite sign react with misfit dislocations, resulting in a new dislocation on the conjugate slip plane (parallel collision) or dislocation locks at the cross-sectional points (cross collision). Screw dislocations bounce at the interface by cross slip if they bump into misfit dislocation in parallel. On the other hand, a zig-zag dislocation is formed on the interface by crisscross cutting, due to the coincidence of Burgers vectors of screw and misfit (edge) dislocations. Then the zig-zag line is straightened with the line tension.