Interaction between deformation twins and interfaces in Cu/Ag alloys

Abstract

We performed molecular dynamic simulation to elucidate the interaction mechanisms between deformation twins and Cu/Ag interfaces. The deformation twins were introduced into the model by gliding a series of Shockley partial dislocations on adjacent slip planes in the Ag side. Both the effects of twinning partial dislocation characters and the structure of Cu/Ag interfaces were considered. The results indicate that twin-interface interaction mechanisms highly depend on the character of twinning partial dislocations and the interface structure. Both twin transmission across the Cu/Ag interface and its reflection at the interface are observed in the current simulation. Moreover, the deformation twin is either thinned by the glide of reflected partial dislocation on the original twinning plane, or reflected to another twinning plane to form a new twin.