常锴骞,王军用,张清,李萍,王莹

• 1:河南科技大学材料科学与工程学院
• 2:洛阳理工学院土木工程学院

摘要(Abstract)：

通过熔炼铸造制备了Mg-4Sm-3Gd-0.5Zr合金，经均匀化处理(525℃×6 h)后，随后在变形温度为360～480℃、应变速率为0.01～1 s~(-1)条件下对其进行了热压缩实验，确定了合金发生动态再结晶时峰值应变和临界应变的关系，计算了合金的热变形激活能，构建并分析了合金的热变形本构方程和热加工图。结果表明：在热变形过程中合金有明显动态再结晶行为，其发生动态再结晶的峰值应变几乎都是临界应变的2.21倍，且合金的流变应力随着应变速率的升高和变形温度的降低而升高；采用热变形本构方程计算的合金热变形激活能Q为240.039 kJ/mol;合金的最佳加工区间为变形温度为420～480℃、应变速率为0.01～0.049 s~(-1),该区间内的能量耗散率η>30%且不发生失稳。

关键词(KeyWords)： Mg-4Sm-3Gd-0.5Zr合金;热变形;本构方程;热加工图

Abstract:

Keywords:

基金项目(Foundation): 河南省科技攻关计划项目(222102230112)

作者(Author): 常锴骞,王军用,张清,李萍,王莹

DOI: 10.13289/j.issn.1009-6264.2023-0573

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