Phase field crystal simulation of dislocation configuration evolution in dynamic recovery in two dimensions

Phase field crystal model is used for studying the grain boundary premelting system under an applied strain at high temperature. The evolution of the dislocation configuration and proliferation and annihilation process of the dislocation and also the characteristic of the morphology of the premelting regions are observed. The results show that the extension premelting domain of the dislocation induced by the applied strain can be regarded as a new phase region (the softening crystal phase domain, SCPD). Due to the lattice softening of the SCPD, two alternant slipping systems exist in it. The cycle processes of the dislocation proliferation by blocking and annihilation by gliding in the SCPD can be regarded as two processes of dynamic recoveries. The evolution of the dislocation configuration and the microscopic mechanism of the cycle dynamic recovery-controlled dislocation at high temperature under plastic deformation in SCPD can well be revealed by the improved KM model. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.