Atomistic simulations of dislocation-precipitate interactions emphasize importance of cross-slip

CV Singh and AJ Mateos and DH Warner, SCRIPTA MATERIALIA, 64, 398-401 (2011).

DOI: 10.1016/j.scriptamat.2010.10.041

This work examines the interaction of screw dislocations with Guinier- Preston (GP) zones using atomistic simulations. Both Orowan looping and cross-slip mechanisms are found to control the interactions. Cross-slip, occurring both at zero and finite temperatures, is found to either significantly reduce or enhance precipitate strengthening, depending upon the orientation of the dislocation-GP zone interaction. The orientation dependence, and its dependence on temperature, provides a micromechanical explanation for the experiments of Muraishi et al. (Philos. Mag. A 82 (2002) 2755). (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Return to Publications page