Influence of nanotwins on stress-driven migration of grain boundaries in deformed nanomaterials
A theoretical model is suggested which describes grain boundary migration under external mechanical load in nanomaterials containing ensembles of nanotwins. In the framework of the model, a disclination description of stress-driven migration of grain boundaries in grains initially containing nanotwins. The energy characteristics and critical stresses for such a migration process are calculated. These critical stresses are compared with those specifying needed for stress-driven migration of grain boundaries in the absence of nanotwing in the exemplary cases of nanocrystalline and ultrafine-grained copper.