(1. 西安建筑科技大学 冶金工程学院，西安 710055；2. 南京理工大学 材料科学与工程学院，南京 210094)
摘 要: 基于复合材料的观点建立纳米/微米Cu细观力学研究模型，采用有限元数值模拟技术对纳米/微米Cu的力学性能进行数值模拟，分析纳米/微米晶的分布、体积分数和形状对纳米/微米Cu强度和塑性的影响。结果表 明：与层状分布相比，立方/球状密封分布的纳米/微米Cu强度和塑性均较大，其塑性随微米晶增韧相体积分数的增大而增大，而屈服强度则逐渐降低；随微米晶增韧相形状因子(有效长径比)的增大，纳米/微米Cu的力学性能表现出明显的各向异性。
关键字: Cu；细观力学模型；韧化；有限元分析；数值模拟
nano-/micro-crystalline Cu
（1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
2. School of Materials Science and Engineering, Nanjing University of Science and Technology,
Nanjing 210094, China）
Abstract:A micro-mechanical model of a nano-/micro-crystalline pure Cu was developed on the basis of the idea of composites. The mechanical properties were analyzed by finite element simulation. The effects of nano-/micro-crystalline distribution, volume fraction and shape on the tensile strength and ductility were investigated. The results indicate that, under uniaxial tensile loading, the tensile strength and ductility in cube or sphere geometry distribution are higher compared to the sandwich geometry distribution. With the increase of microcrystalline volume fraction of toughening phase, the ductility of the nano-/micro-crystalline pure Cu increases and the yield strength decreases. The strength and ductility of the nano-/micro-crystalline pure Cu have an obvious isotropy with the increase of the shape factor of microcrystalline toughening phase.
Key words: Cu; micro-mechanical model; toughening; finite element analysis; numerical simulation
