NUMERICAL SIMULATION FOR DEFORMATION OF NANO-GRAINED METALS

• 来源期刊: 力学学报（英文版）
• 学科: 物理学
• 年，卷（期）: 2002,（5）
• 页码范围: 506-515
• 页数: 10页
• 分类号: O3
• 语种: 英文

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.