Disorientations in dislocation boundaries: formation and spatial correlation

During plastic deformation dislocation boundaries appear separating regions of different orientation. The occurrence of disorientations across these b oundaries is discussed with emphasis on several types of boundaries. For in cidental dislocation boundaries a statistical origin of disorientations is considered, additional deterministic contributions arising from geometrical reasons are taken into account for geometrically necessary boundaries. The resulting diversity in the modelled boundary behaviour explains the experi mentally observed differences in the dependence of the average disorientati on angle on plastic strain. Spatial correlations between disorientation ang les of neighbouring boundaries are investigated. (C) 2001 Elsevier Science B.V. All rights reserved.