COMPETING DEFORMATION MECHANISMS IN NANOCRYSTALLINE METALS

摘要

The deformation of nanocrystalline copper and molybdenum has been simulated using molecular dynamics. Competing deformation mechanisms are observed in the simulations, including grain boundary sliding, dislocation motion, twinning and intergranular fracture. The balance between these mechanisms depends on the grain size and the material, the most dramatic difference being that fracture is dominating in molybdenum while not observed in copper.