(1. 华南理工大学 机械工程学院，广州 510640；
2. 哈尔滨工业大学 材料科学与工程学院， 哈尔滨 150001)
摘 要: 基于高能球磨过程中粉末的大塑性变形行为的分析， 推导了球磨粉体的本构方程， 并针对球磨Ti/Al粉末的挤压过程进行了有限元模拟。 分析结果表明， 随着球磨时间的延长， 粉末固结致密难度增加， 所需挤压力显著增大。 该趋势和模拟数值均与挤压实验结果基本一致，验证了所推导的球磨粉体本构方程的合理性。
关键字: Ti/Al粉末； 高能球磨； 本构关系； 挤压； 数值分析
（1. School of Mechanical Engineering, South China University of Technology, Guangzhou 510640, China;
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
Abstract:On the basis of analysis of deformation behavior of powders during high energy milling, the plastic constitutive equation of milled powders was established. And using the equation, the extrusion of milled Ti/Al powders was further simulated by finite element method. The simulation results show that, with increasing the milling time, the densification of powders becomes more and more difficult, and the needed extrusion pressure substantially rises. Both the trend and the simulation data agree well with the experimental results, which affirms that the established plastic constitutive equation of milled powders is reasonable.
Key words: Ti/Al powder; high energy ball milling; plastic constitutive equation; extrusion; numerical simulation
