Dislocation core energies in the Peierls model

Within the framework of the Peierls-Nabarro model, dislocation core energies and core tensions are computed for Cu, Ni, Ag and Cu-Al alloys. Dissociation into partial dislocations and elastic anisotropy are taken into account. The splitting width and the core radius are less for screw than for edge dislocations. Core energies (tensions) are higher (lower) for screw than for edge orientation. Since this is opposite to the tendency of the elastic continuum contribution, the core terms have a remarkable influence on the shape of dislocation loops.