The creation and accommodation of extrinsic dislocations at grain boundaries

Abstract

Abstract This paper considers the observation of extrinsic grain boundary dislocations in a commercial austenitic steel. It is shown that the stability of these non-equilibrium defects is a sensitive function of the precise thermo-mechanical history of the specimen material and is often controlled by the presence of active pinning centres in the grain boundary (e.g. solute and/or precipitate)