Plastic flow in b c c solid solutions

Abstract

Available data on the temperature dependence of the CRSS of potassium, sodium, niobium, tantalum and of several binary bcc alloys are examined with reference to the kink-pair process of dislocation movement described by Butt and Feltham [1]. The model is found to account for the observations on the pure metals; equally the temperature and concentration dependence of the CRSS of the alloys are encompassed by it when the alloy-atom pinning of edge dislocations becomes strong enough to render the latter less mobile under stress than the screws.