毛训聪,陈乐平,彭聪

• 1:南昌航空大学航空制造工程学院

摘要(Abstract)：

为了研究Mg-Zn-Zr-Gd合金的热压缩变形行为，采用Gleeble-3500型热模拟试验机，在变形温度为300～400℃,变形速率为0.001～1 s~(-1)条件下对合金进行热压缩实验。分析了在不同的热压缩条件下合金的真应力-真应变曲线，通过引入Z参数建立了相关流变应力本构方程，同时观察了合金的微观组织演变。结果表明：合金在热压缩变形过程中主要发生了动态再结晶，且合金的流变应力随着应变速率降低和温度升高而减小。在低变形温度或高应变速率下进行热压缩变形时，再结晶晶粒比较细小，但是动态再结晶进行不充分，动态再结晶仅仅发生在晶界处且分布不均匀，仍然存在原始大晶粒。随着变形温度的升高和应变速率的降低，再结晶区域明显增加，再结晶晶粒也逐渐长大。根据热加工图分析得到合金最佳的热加工成形工艺区域为：温度为350～400℃,应变速率为0.1～1 s~(-1)。

关键词(KeyWords)： Mg-Zn-Zr-Gd合金;热变形;本构方程;动态再结晶

Abstract:

Keywords:

基金项目(Foundation): 江西省科技重点研发项目(20212BBE53018);; 江西省教育厅科技资助项目(DA202103161)

作者(Author): 毛训聪,陈乐平,彭聪

DOI: 10.13289/j.issn.1009-6264.2022-0263

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