Abstract
A tight-binding type electronic theory is used to calculate the interaction energy between a self-interstitial and a (1/2) screw dislocation in bcc transition metals (α-Fe, W and Nb). The repulsive core-core interaction energies are simulated by a Born-Mayer type potential as well as a simple power law potential. It is shown that the maximum interstitial-screw dislocation binding energy is comparable to the double-kink nucleation energy and can account for the irradiation softening of bcc transition metals.
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