稀土镁合金GW93的热流变行为及变形组织

doi:10.13251/j.issn.0254-6051.2025.11.007

摘要/Abstract

摘要： 利用Gleeble-1500D热/力模拟试验机对铸态Mg-9Gd-3Y-0.6Zn-0.5Zr(GW93)合金进行不同变形温度(350、400和450 ℃)及不同变形速率(10^-3、10^-2和10^-1 s^-1)的压缩试验,研究了其压缩变形过程中的流变行为及组织演变。结果表明,相同变形速率下,变形温度升高,有助于合金动态再结晶的进行。随变形温度升高,动态再结晶产生的细小晶粒体积分数增加,且动态再结晶晶粒尺寸逐渐增大。相同变形温度下,随变形速率的增加,合金的峰值应力增大,变形越来越困难。在低的变形速率下,动态再结晶更易发生。在450 ℃变形温度下,再结晶晶粒尺寸随着变形速率的增大而减小。

关键词: 稀土镁合金, 热压缩, 热流变行为, 动态再结晶

Abstract: Compression tests were conducted on as-cast Mg-9Gd-3Y-0.6Zn-0.5Zr (GW93) alloy using a Gleeble-1500D thermo-mechanical simulation testing machine under different deformation temperatures (350, 400, 450 ℃) and different strain rates (10^-3, 10^-2, 10^-1 s^-1). Thermal rheological behavior and microstructural evolution of the alloy during compression deformation were investigated. The results show that at a constant strain rate, an increase in deformation temperature promotes the dynamic recrystallization (DRX) of the alloy. As the deformation temperature increases, the volume fraction of fine grains generated by dynamic recrystallization increases, and the dynamic recrystallization grain size gradually grows. At a fixed deformation temperature, the peak stress of the alloy increases with the increase of strain rate, making deformation more difficult. Dynamic recrystallization occurs more easily at lower strain rates. When the deformation temperature is 450 ℃, the recrystallized grain size decreases as the strain rate increases.

Key words: rare earth magnesium alloy, hot compression, thermal rheological behavior, dynamic recrystallization

中图分类号:

TG456.6

王丁, 黄杏利, 孙昊, 张鹏辉, 吴江涛, 朱磊. 稀土镁合金GW93的热流变行为及变形组织[J]. 金属热处理, 2025, 50(11): 49-54.

Wang Ding, Huang Xingli, Sun Hao, Zhang Penghui, Wu Jiangtao, Zhu Lei. Thermal rheological behavior and deformation microstructure of rare earth magnesium alloy GW93[J]. Heat Treatment of Metals, 2025, 50(11): 49-54.

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