夏祥生,陈文,黄少东,等.Mg-RE-Zn-Zr合金的热变形行为和加工图研究[J].精密成形工程,2020,12(6):136-144.
XIA Xiang-sheng,CHEN Wen,HUANG Shao-dong,et al.Hot Deformation Behavior and Processing Map of Mg-RE-Zn-Zr Alloy[J].Journal of Netshape Forming Engineering,2020,12(6):136-144. |
| Mg-RE-Zn-Zr合金的热变形行为和加工图研究 |
| Hot Deformation Behavior and Processing Map of Mg-RE-Zn-Zr Alloy |
| 投稿时间：2020-08-29 |
| DOI：10.3969/j.issn.1674-6457.2020.06.019 |
| 中文关键词: Mg-RE-Zn-Zr合金 高温压缩行为 应力预测 激活能 |
| 英文关键词: Mg-RE-Zn-Zr alloy high temperature compression behavior stress prediction activation energy |
| 基金项目: |
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| 中文摘要: |
| 目的 建立Mg-8.5Gd-4.5Y-0.7Zn-0.4Zr合金的本构方程和加工图，得到材料的可加工变形参数。方法 采用Gleeble实验机开展温度范围为300~500 ℃，应变速率范围为0.001~1 s–1的高温单轴压缩实验。结果 流变应力随应变速率的升高和变形温度的降低而增加，当在变形温度为300 ℃，变形速率为0.1 s–1和1 s–1变形时，试样发生了早期开裂;计算得到了合金的变形激活能为228.414 kJ/mol，较高的活化能与LPSO相的存在有关;合金加工图中存在两个可加工区域，第一个区域在变形温度为350~420 ℃，应变速率为0.001~ 0.01 s–1的范围内，第二个区域在变形温度为420~480 ℃，应变速率为0.005~0.1 s–1的范围内。结论 建立的本构方程得到预测流动应力值与实验值吻合良好，加工图中两个可加工区域的变形机制都为动态再结晶。 |
| 英文摘要: |
| The work aims to build the constitutive equation and processing map of Mg–8.5Gd–4.5Y–0.7Zn–0.4Zr alloy to obtain the machined deformation parameters of the material. Uniaxial compression tests at 300 ℃ to 500 ℃ and strain rate ranges from 0.001 s–1 to 1 s–1 were conducted with Gleeble-1500D simulated machine. The flow stress increased with the increase of strain rate and the decrease of deformation temperature. When deformed at 300 ℃ at strain rates of 0.1 s−1 and 1 s−1, early failures occurred. The activation energy was calculated to be 228.414 kJ/mol. Such high activation energy can be ascribed to the presence of LPSO phase. There were two feasible processing domains in processing map, the first domain was in the temperature range from 350 ℃ to 420 ℃ and strain rate range from 0.001 s–1 to 0.01 s–1, and the second domain was in the temperature range from 420 ℃ to 480 ℃ and strain rate range from 0.005 s–1 to 0.1 s–1. The predicted flow stress values obtained through the constitutive equation established were agreed well with the experimental values. The deformation mechanism in two feasible processing domains is dynamic recrystallization. |
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