TWINNING MECHANISM AND YIELD STRESS IN NANOTWINNED MATERIALS

Nanotwinned materials are ultrafine-grained materials which contain high-density ensembles of nanoscale twins. They exhibit simultaneously high strength and good ductility. A brief review of the theoretical models which describe specific twinning mechanism and dependence of yield stress in nanotwinned materials is presented. In the framework of the model, new micromechanism through nanotwin widening in nanotwinned materials is considered. In addition, dependence of the yield stress on twin thickness in nanotwinned cooper (Cu) is theoretically described. The theoretical results and their comparison with corresponding experimental data in the exemplary case of nanotwinned cooper (Cu) are discussed.