镁合金zk60的三维加工图及失稳分析-中国有色金属学报.pdf

第 18 卷第 6 期 中国有色金属学报 2008 年 6 月 Vol.18 No.6 The Chinese Journal of Nonferrous Metals Jun. 2008 文章编号：1004-0609(2008)06-1020-07 镁合金 ZK60 的三维加工图及失稳分析 刘 娟，崔振山，李从心 (上海交通大学 模具 CAD 国家工程研究中心，上海 200030) 摘 要：在 PRASAD 提出的二维加工图的基础上，建立包含应变的三维加工图，经分析得到适合镁合金 ZK60 的失稳判据，讨论并解决了三维加工图绘制中的关键技术。在Gleeble−1500 热模拟机上对镁合金 ZK60 进行了热 压缩实验，研究了 200~360 ℃和 0.01~5 /s 条件下的热变形行为。该加工图的结果显示一个非失稳、功率耗散峰值 区：温度为 300~360 ℃、应变速率为 0.01~0.1 /s，功率耗散平均值为 35%，此区为适合的加工区。 关键词：ZK60 ；三维加工图；动态材料模型；功率耗散系数；流变失稳 中图分类号：TG 113.26 文献标识码：A Three-dimensional processing maps and flow instability of magnesium alloys ZK60 LIU Juan, CUI Zhen-shan, LI Cong-xin (National Die and Mold CAD Engineering Research Center, Shanghai Jiao Tong University, Shanghai 200030, China) Abstract ：Based on the processing map proposed by PRASAD, the three-dimensional processing maps including strain were built and the favorite instability criterion was studied and the key technologies in plotting the three-dimensional processing maps were discussed. The Gleeble−1500 thermomechanical simulation tests of magnesium alloy ZK60 were conducted. The hot deformation behaviors in the temperature range of 200−360 ℃ and strain rate range of 0.01−5 /s were studied. The three-dimension processing maps show that the most favorite deformation domain is the temperature range of 300−360 ℃ and the strain rate range of 0.01−0.1 /s, with a peak efficiency of power dissipation of about 28%. Key words ：ZK60; 3-D processing map; dynamic material model; power dissipation efficiency; flow instability FROST 和 ASHBY[1]用 ASHBY 图的形式描绘了 应该避免的不稳定性流变区域，并且还可获得优化的 材料对加工工艺参数的反应，由于此图基于蠕变机制，