(1. 華南理工大學(xué) 機(jī)械工程學(xué)院，廣州 510640；
2. 哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院， 哈爾濱 150001)
摘 要: 基于高能球磨過(guò)程中粉末的大塑性變形行為的分析， 推導(dǎo)了球磨粉體的本構(gòu)方程， 并針對(duì)球磨Ti/Al粉末的擠壓過(guò)程進(jìn)行了有限元模擬。 分析結(jié)果表明， 隨著球磨時(shí)間的延長(zhǎng)， 粉末固結(jié)致密難度增加， 所需擠壓力顯著增大。 該趨勢(shì)和模擬數(shù)值均與擠壓實(shí)驗(yàn)結(jié)果基本一致，驗(yàn)證了所推導(dǎo)的球磨粉體本構(gòu)方程的合理性。
關(guān)鍵字: Ti/Al粉末； 高能球磨； 本構(gòu)關(guān)系； 擠壓； 數(shù)值分析
HU Lian-xi2, WANG Er-de2
（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
