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| 挤压态Mg-Gd-Y-Zn-Zr合金本构方程及加工图 |
| Constitutive Equation and Processing Map of an As-Extruded Mg-Gd-Y-Zn-Zr Alloy |
| Received:August 25, 2021 |
| DOI：10.3969/j.issn.1674-6457.2022.02.015 |
| 中文关键词: 镁合金 本构方程 加工图 显微组织 |
| 英文关键词: magnesium alloy constitutive equation processing map microstructure |
| 基金项目: |
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| 中文摘要: |
| 目的 通过热模拟实验研究挤压态Mg-8.5Gd-4.5Y-0.7Zn-0.4Zr合金的本构方程及加工图。方法 在Gleeble热模拟机上开展应变速率为0.001~1 s−1，变形温度为300~450 ℃条件下的单轴热压缩实验。根据动态材料模型，建立合金的热加工图，分析功率耗散因子随变形温度、应变速率和应变的变化规律。结果 合金的流变应力在不同的变形温度和应变速率下表现出不同的特征，流变应力与变形温度和应变速率的关系可用双曲正弦本构关系来描述，其平均激活能为209.223 kJ/mol，应力指数为3.442。合金的失稳区出现在变形温度为420~450 ℃，应变速率为0.1~1 s−1的范围内。结论 得到了挤压态合金的本构方程，合金最佳热加工工艺参数为变形温度为400 ℃，应变速率为1 s−1。 |
| 英文摘要: |
| The work aims to study the constitutive equation and processing map of an as-extruded Mg-Gd-Y-Zn-Zr alloy by isothermal compression tests. Homotaxial isothermal compression test was conducted on Gleeble simulated machine at 0.001 s–1 to 1 s–1 and 300 ℃ to 450 ℃. The processing map was established according to dynamic material model. The variation of power dissipation factor with deformation temperature, strain rate and strain was analyzed. The flow stress of the alloy showed different characterizations under different temperature and strain rate. The relationship between flow stress, deformation temperature and strain rate can be expressed by hyperbolic sine function. The average activation energy was 209.223 kJ/mol, and the stress exponent was 3.442. The deformation temperature in the instability regions of the alloy was 420~450 ℃ and strain rate was 0.1~1 s‒1. The constitutive equation of the as-extruded alloy is obtained. The optimum hot working condition for as-extruded Mg-Gd-Y-Zn-Zr alloy is determined to be 400 ℃ and 1 s‒1. |
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