| 冯英豪,孙朝阳,徐斯诺,朱南洋,王青磊,王春晖.双相Mg-Li合金的 α→β 相变及热加工性能研究[J].稀有金属材料与工程,2023,52(4):1227~1237.[Feng Yinghao,Sun Chaoyang,Xu Sinuo,Zhu Nanyang,Wang Qinglei,Wang Chunhui.Hot Workability of Dual-Phase Mg-Li Alloy with α→β Trans-formation at Elevated Temperatures[J].Rare Metal Materials and Engineering,2023,52(4):1227~1237.] |
| 双相Mg-Li合金的 α→β 相变及热加工性能研究 |
| 投稿时间：2022-09-21 修订日期：2023-04-03 |
| 中文关键词: Mg-Li合金 热变形行为 动态再结晶 加工优化 相变 |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）, |
| 中文摘要: |
| 在温度为250?400 ℃、应变速率为0.1?10 s-1条件下进行了热压缩试验，研究了双相Mg-Li合金的热加工性能、显微组织演变和相组成。建立了整合加工和α-Mg相含量的最佳热加工窗口。结果表明，所建立的Arrhenius本构模型能够准确预测软化过程中的应力流动行为。通过对合金显微组织的观察，发现动态回复（DRV）、动态再结晶（DRX）和α-Mg相变是主要的软化机制。α-Mg相以球化和α-Mg相内析出的形式转变为β-Li相，尤其是在300 ℃以上相变现象显著。同时，DRX行为容易在β-Li相中发生，而在α-Mg相中会被抑制。基于动态材料模型和微观结构分析，获得最佳加工窗口：温度300?350 ℃/0.1?1 s-1和温度250 ℃/0.1 s-1。 |
| Hot Workability of Dual-Phase Mg-Li Alloy with α→β Trans-formation at Elevated Temperatures |
| 英文关键词:Mg-Li alloy hot deformation behavior dynamic recrystallization workability optimization phase transformation |
| 英文摘要: |
| Hot workability, microstructure evolution, and phase composition of dual-phase Mg-Li alloy were investigated via hot compression test at 250?400 °C with strain rates of 0.1?10 s-1. The optimum hot workability window integrating processing and α-Mg content maps was established. Results show that the established Arrhenius constitutive model can accurately predict the stress flow behavior during work softening. In addition, the microstructure of the alloy shows that dynamic recovery (DRV), dynamic recrystallization (DRX) and α-Mg phase transformation are the main softening mechanisms. α-Mg phase is transformed into β-Li phase in forms of both spheroidization and internal precipitation of α-Mg phase, especially above 300 °C. Meanwhile, the DRX process can easily occur in β-Li phase, whereas in the α-Mg phase it is retarded. Based on the dynamic materials model and microstructure analysis, the optimal processing window can be obtained as 300?350 °C/0.1?1 s-1 and 250 °C/0.1 s-1. |
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