| 摘要: |
| 采用Gleeble-3500热压缩模拟试验机，以铸态Mg-9.5Gd-4Y-2Zn-0.5Zr合金为原材料，在变形温度为350～500 ℃、应变速率为0.001～1 s-1的条件下对其进行热压缩实验，结果表明，合金的流变应力对变形温度、应变速率及应变均呈现出高度的敏感性。基于真应力-应变数据，利用双曲正弦模型建立了含应变补偿的合金热本构方程。同时，基于动态材料模型，绘制了合金在不同真应变条件下的热加工图，结合实物图与合金第二相演变分析，确定了合金的最佳热加工工艺区域为：变形温度为450～500 ℃、应变速率为0.018～0.051 s-1。 |
| 关键词: Mg-Gd-Y-Zn-Zr合金 热压缩 本构方程 应变补偿 热加工图 |
| 基金项目:国家自然科学基金项目（52205344）。 |
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| Hot Deformation Behavior and Hot Processing Map of Mg-9.5Gd-4Y-2Zn-0.5Zr Alloy |
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Song Xipei1, Su Yulu2, Fu Minmin3, Si Chuanliang1, Liu Hao3, Zhang Wenxue3, Wang Wenke*1,3
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1. School of Materials Science and Engineering, Harbin Institute of Technology (Weihai), Weihai 264209;2. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 210003;3. Capital Aerospace Machinery Co., Ltd., Beijing 100076
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| Abstract: |
| Hot compression experiments of the as-cast Mg-9.5Gd-4Y-2Zn-0.5Zr alloy were carried out by using the Gleeble-3500 thermo-simulation test machine under deformation temperatures of 350～500 ℃ and strain rates of 0.001～1 s-1. The results indicate that the flow stress of the alloy is influenced by deformation temperature, strain rate, and strain. Based on the true stress-strain data, a thermo-constitutive equation of the alloy with strain compensation was established using the hyperbolic sine model. Meanwhile, based on the dynamic material mode, hot processing maps of the alloy were plotted under different true strain conditions. Combining with the actual object images and the analysis of alloy second phase evolution, the optimal thermal processing parameters for the alloy were determined to be a deformation temperature of 450～500 ℃ and a strain rate of 0.018～0.051 s-1. |
| Key words: Mg-Gd-Y-Zn-Zr alloy hot compression constitutive equation strain compensation hot processing map |
