朱利敏,李全安,陈晓亚,张清,左君茹

• 1:河南科技大学材料科学与工程学院
• 2:有色金属新材料及先进加工技术省部共建协同创新中心
• 3:河南省有色金属材料科学与加工技术重点实验室

摘要(Abstract)：

利用铸造法制备了Mg-8Gd-3Sm-0.5Zr合金，绘制了合金在350～500℃、应变速率为0.002～1 s~(-1)时热压缩后的真应力-真应变曲线，构建了热加工图，研究了热压缩工艺对合金组织的影响，分析了其热压缩失效的原因。结果表明：Mg-8Gd-3Sm-0.5Zr合金在热压缩变形时发生了动态再结晶，适宜的热压缩温度为400～500℃,应变速率为0.004～0.05 s~(-1)。Mg-8Gd-3Sm-0.5Zr合金热压缩失效的原因主要有3种：第一，热压缩温度偏低，应变速率高，造成变形不协调引起裂纹产生；第二，热压缩温度低、应变速率低，或者热压缩温度较高、应变速率也高造成晶界处细小动态再结晶晶粒呈链状分布引起变形不均匀造成失稳；第三，原始组织中粗大的化合物分布于晶界处，造成应力集中引起变形失稳。

关键词(KeyWords)： Mg-8Gd-3Sm-0.5Zr合金;热加工图;动态再结晶;裂纹

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51571084)

作者(Author): 朱利敏,李全安,陈晓亚,张清,左君茹

DOI: 10.13289/j.issn.1009-6264.2021-0427

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