Mg-9Gd-4Y-0.6Mn合金的微观组织与力学性能Microstructure and mechanical properties of Mg-9Gd-4Y-0.6Mn alloy
肖阳,张新明,陈健美,蒋浩
摘要(Abstract):
通过热分析、X射线衍射、扫描电镜、透射电镜等手段分析了Mg-9Gd-4Y-0.6Mn合金的微观组织,并在室温到400℃的温度区间进行力学拉伸试验。结果表明合金在400℃时产生的超塑性现象,伸长率达266%,拉伸过程中出现动态再结晶协调晶界滑移的超塑性变形机制;在凝固过程中合金易偏析形成Mg3X(X为Gd和Y)相,Mg3X相用固溶处理的方法难以消除;在Cast-T5、Cast-T6、Rolled-T5和Rolled-T6的四种热处理状态中,Rolled-T5态的硬度最高,达121HV10;沿棱柱面析出的高密度板状析出相能有效地阻碍镁基面上的位错滑移,这是合金强化和耐热的主要原因。
关键词(KeyWords): Mg-Gd-Y-Mn合金;耐热;组织;力学性能;超塑性
基金项目(Foundation): 国家“863”计划资助项目(2005AA741062,2004AA741062);; 国家科研项目(5133001E)和(51412020304QT7106)
作者(Author): 肖阳,张新明,陈健美,蒋浩
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