Study of dislacation Ni-Cu interface interaction with Peierls-Nabarro model

Metallic multi-layered structures have received increasingly interest in the past few years because of their unusual and interesting mechanical properties and high strength-to-weight ratio. The mechanical properties of an interface are determined, in large part, by the nature of the chemical bonding at the interface, which may be significantly different from that within either of the materials meeting at the interface. The resistance of interfaces to dislocation transmission is a fundamental quantity that often serves to control strength in plastically deforming multiphase materials. We have generalized an multi-scale approach based on semi-discrete variational generalized Peierls-Nabarro (SVGPN) for the pure Cu, Ni, and the (001) Ni-Cu interface have calculated from ab initio calculations. Various dislocation properties, such as the core width, energy, the Peierls stress, the dissociation behavior are investigated and compared to those of pure Cu and Ni hosts. Supported by US Air Force grant 0205GDD417.