Dislocation Grain Boundary Interactions in Irradiated Metals

Abstract

The presence of an irradiation hardened matrix does not change the condition for the selection of the activated slip system to transfer strain across a grain boundary The presence of an irradiation hardened matrix transitions the rate limiting step from nucleation of dislocations from grain boundary sources to propagation away from the grain boundary. Grain boundary source is not a line source but an area of the grain boundary. This impacts the width of the channels. Pre-existing dislocations essentially frozen in place by the irradiation.