李慧中,王海军,刘楚明,刘洪挺,郭菲菲,梁霄鹏

• 1:中南大学材料科学与工程学院
• 2:中南大学有色金属材料科学与工程教育部重点实验室

摘要(Abstract)：

采用Gleeble-1500热模拟实验机在温度为623～773 K,应变速率为0.001～1 s-1条件下对Mg-10Gd-4.8Y-2Zn-0.6Zr(wt%)合金进行热压缩实验,研究了该合金热变形行为及热加工特征,建立了该合金热变形时的本构方程和加工图。结果表明,该合金高温变形时的峰值应力随着应变速率的降低和变形温度的升高而显著减小;变形激活能为289.36 kJ/mol;合金高温变形时存在两个失稳区,分别是变形温度为770～773 K,应变速率为0.1 s-1左右的区域,和变形温度小于750 K,应变速率小于0.03s-1的区域;合金的最佳热加工温度为750～773 K,应变速率为0.001～0.01 s-1。

关键词(KeyWords)： Mg-10Gd-4.8Y-2Zn-0.6Zr合金;变形激活能;本构方程;加工图;组织

Abstract:

Keywords:

基金项目(Foundation): 中国博士后基金资助项目(200704200828);; 中南大学博士后基金资助项目(2007-8)

作者(Author): 李慧中,王海军,刘楚明,刘洪挺,郭菲菲,梁霄鹏

DOI: 10.13289/j.issn.1009-6264.2010.07.006

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