A Peierls model was used to study the role of interfacial sliding during dislocation transmission. A straight screw dislocation parallel to a bimaterial interface was considered, with incoming and outgoing slip planes that were continuous and coplanar. Interfacial sliding was predicted to increase the critical applied shear, γcrit, of interfaces for transmission. A simple explanation was that sliding delocalized the dislocation core within the interface, thereby creating a larger, more abrupt fluctuation in dislocation line energy during transmission. Interfacial sliding and dislocation trapping were promoted by weak interfacial bonding, which was characterized primarily by small interfacial unstable stacking fault energy. The results were consistent with atomistic documenting showing dislocation trapping at interfaces.

Transmission of a Screw Dislocation across a Coherent, Slipping Interface. Y.Shen, P.M.Anderson: Acta Materialia, 2006, 54[15], 3941-51