LI. The strength of homer-cottrell sessile dislocations

Abstract

Abstract A Lomer-Cottrell sessile dislocation at the head of a piled-up group of dislocations may give way under the combined action of stress and temperature. Depending on its orientation relative to the group, the dislocation may yield either by recombining and slipping on a (100) plane or by dissociating into the two dislocations from which it was formed. The size of the group required for both these mechanisms is obtained as a function of stress, but the results depend rather sensitively on the structure of the dislocation core.