Mg-Y-Nd-Gd-Zr合金的热变形和加工图

赵欣; 张奎; 李兴刚; 李永军; 何庆彪; 孙建锋

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Mg-Y-Nd-Gd-Zr合金的热变形和加工图
Hot Deformation and Processing Maps of Mg-Y-Nd-Gd-Zr Alloy
2008年第3期页码：218-221
纸质出版日期： 2008 ，
DOI：

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[1]赵欣,张奎,李兴刚,李永军,何庆彪,孙建锋.Mg-Y-Nd-Gd-Zr合金的热变形和加工图[J].特种铸造及有色合金,2008(03):218-221+162-163.

Zhao Xin1, Zhang Kui1, Li Xinggang1, et al. Hot Deformation and Processing Maps of Mg-Y-Nd-Gd-Zr Alloy[J]. Special Casting & Nonferrous Alloys, 2008,(3):218-221.
[1]赵欣,张奎,李兴刚,李永军,何庆彪,孙建锋.Mg-Y-Nd-Gd-Zr合金的热变形和加工图[J].特种铸造及有色合金,2008(03):218-221+162-163. DOI：

Zhao Xin1, Zhang Kui1, Li Xinggang1, et al. Hot Deformation and Processing Maps of Mg-Y-Nd-Gd-Zr Alloy[J]. Special Casting & Nonferrous Alloys, 2008,(3):218-221. DOI：

摘要

采用GLEEBLE-1500热模拟实验机对Mg-Y-Nd-Gd-Zr合金在变形温度为523～723K、应变速率为0.002～1.000s-1、最大变形程度为50%的条件下

进行了高温压缩试验研究。采用指数关系式描述了合金在热变形过程中的稳态流变应力。利用动态材料模型构建了热加工图

结合组织观察结果认为

该合金在变形温度为673K、应变速率为1.000s-1时功率耗散效率达到峰值0.36

因此

中温高应变速率区域为最佳加工性能区域。要想获得较大范围的最佳加工性能区域

应采用多道次小变形量进行加工。

Abstract

Hot compression testing of Mg-Y-Nd-Gd-Zr magnesium alloy RE-containing was performed on the Gleeble 1 500 at strain rate in range of 0.002 to 1 s-1 and temperature from 250 to 450 ℃ with the deformation degree of 50%.The steady flow stress during hot deformation was calculated by the exponential equation.Processing map of the alloy was established on the basis of dynamic material model.Microstructural observation indicate that the peak value of dissipation factor is 0.36 at 400 ℃ and 1s-1

which shows that the domain at the medium temperature and high strain rate is the desirable processing performance area.In addition

the working processing of more pass with small reduction rate is helpful to obtaining a larger region of desirable processing performance.