王健,李全安,陈晓亚,梅婉婉

• 1:河南科技大学材料科学与工程学院
• 2:有色金属新材料与先进加工技术省部共建协同创新中心

摘要(Abstract)：

在变形温度为250～400℃,应变速率为0.003～1 s~(-1)的条件下,采用热模拟试验机对AZ81-1Y镁合金进行了热压缩实验,研究其热变形行为,分析了其微观组织演变规律及真应力-真应变曲线,并结合双曲正弦本构模型建立了其流变应力本构方程,并对流变应力本构方程进行了验证。结果表明:在一定的应变速率下,AZ81-1Y镁合金的流变应力随着变形温度的升高而降低;在同一变形温度下,流变应力随着应变速率的增大而增大;AZ81-1Y镁合金对温度及应变速率十分敏感,且有明显的再结晶现象;通过真应力-应变曲线得到AZ81-1Y镁合金的双曲正弦本构方程,计算其热激活能为153.23 kJ/mol;通过本构方程计算出的峰值应力与实验值具有较好吻合性,平均相对误差最大仅为2.294%。

关键词(KeyWords)： AZ81-1Y镁合金;热变形;流变应力;本构方程

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51571084)

作者(Author): 王健,李全安,陈晓亚,梅婉婉

DOI: 10.13289/j.issn.1009-6264.2021-0376

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