NUMERICAL SIMULATION FOR DEFORMATION OF NANO-GRAINED METALS

摘要

Electro-deposition technique is capable of producing nano-grainedbulk copper specimens that exhibit superplastic extensibility at room temperature.Metals of such small grain sizes deform by grains sliding, with little distortion occur-ring in the grain cores. Accommodation mechanisms such as grain boundary diffusion,sliding and grain rotation control the kinetics of the process. Actual deformation min-imizes the plastic dissipation and stored strain energy for representative steps of grainneighbor switching. Numerical simulations based on these principles are discussed inthis paper.