Electronic theory for screw dislocation in b.c.c. transition metals

Abstract

A simple calculation of the Peierls stress and the core energy of the screw dislocation in b.c.c. transition metals is presented. The d-electrons are treated in a tight-binding approximation and Born-Mayer type potentials are used to simulate the repulsive core—core interactions at short distances. Numerical results are compared with experiments as well as the previous calculations based on the empirical pair potentials.