FORMATION OF PARTIAL DISLOCATIONS DURING INTERSECTION OF GLIDE DISLOCATIONS WITH FRANK LOOPS IN FCC LATTICES

Interactions of moving dislocations with Frank loops in quenched or ir radiated materials can result in either coalescence or intersection re actions. The latter lead to the formation of partial dislocations asso ciated with the resulting half loops. Alloy stacking fault energy (SFE ) and specific deformation conditions are shown to control the reactio n of the partial dislocations with the half loops. Based on this analy sis, a partial dislocation mechanism is proposed that allows explanati on of partial unfaulting, stacking fault extension, and twin formation , previously observed during plastic deformation of irradiated austeni tic stainless steel. Copyright (C) 1997 Acta Metallurgica Inc.