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| 挤压态Mg-Gd-Y-Zn-Zr合金热变形行为研究 |
| Hot Deformation Behaviour of Extruded Mg-Gd-Y-Zn-Zr Alloy |
| Received:October 10, 2013 Revised:October 10, 2013 |
| DOI：10.3969/j.issn.1674-6457.2014.01.009 |
| 中文关键词: Mg -Gd -Y-Zn -Zr 合金 高温压缩行为 流变应力 激活能 |
| 英文关键词: Mg-Gd-Y-Zn-Zr alloy high-temperature compression behavior flow stress deformation activation energy |
| 基金项目: |
| Author Name | Affiliation | | XIAO Yuan-lun | Southwest Research Institute of Technology Engineering, Chongqing 400039, China
National Defense Research and Application Centre of Precision Plastic Forming Technology, Chongqing 400039, China | | ZHAO Jun | Southwest Research Institute of Technology Engineering, Chongqing 400039, China
National Defense Research and Application Centre of Precision Plastic Forming Technology, Chongqing 400039, China | | LI Zu-rong | Southwest Research Institute of Technology Engineering, Chongqing 400039, China
National Defense Research and Application Centre of Precision Plastic Forming Technology, Chongqing 400039, China | | ZHANG Chao-rong | Southwest Research Institute of Technology Engineering, Chongqing 400039, China
National Defense Research and Application Centre of Precision Plastic Forming Technology, Chongqing 400039, China | | ZHAO Qiang | Southwest Research Institute of Technology Engineering, Chongqing 400039, China
National Defense Research and Application Centre of Precision Plastic Forming Technology, Chongqing 400039, China | | BAI Yu-he | Southwest Research Institute of Technology Engineering, Chongqing 400039, China | | WU Dao-xun | Southwest Research Institute of Technology Engineering, Chongqing 400039, China | | XIA Xiang-sheng | Southwest Research Institute of Technology Engineering, Chongqing 400039, China
National Defense Research and Application Centre of Precision Plastic Forming Technology, Chongqing 400039, China |
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| 中文摘要: |
| 目的 研究挤压态 Mg -8 . 90 Gd - 5 . 11 Y - 3 . 10 Zn - 0 . 47 Zr 高强镁合金在变形温度 300 ~ 500℃ 、应变速率为 0 . 001 ~ 1 s-1之间的热变形行为。 方法 采用 Gleeble 试验机进行高温单轴压缩试验。 结果 流变曲线具有典型的动态再结晶特征,应力随应变速率的升高或变形温度的降低而增加。 分别采用指数关系、幂指数关系与双曲正弦函数关系对热变形行为进行表征,拟合度最好的是双曲正弦函数关系,平均线性回归系数达到 0 . 974 484 。 合金的变形激活能随着变形温度的升高呈现下降的趋势。 结论 热压缩行为可以采用双曲正弦函数关系进行表达,应力指数和平均热激活能分别为:n = 3 . 860 86 ,Q = 234 . 0476 kJ / mol。 |
| 英文摘要: |
| Objective To study the hot deformation behaviors of extruded Mg-8. 90Gd-5. 11Y-3. 10Zn-0. 47Zr alloy. Methods High-temperature uniaxial compression tests were conducted using Gleeble -1500D simulated machine. Results Hot compression tests were carried out in the temperature range of 300 ~ 500 ℃ and strain rate of 0. 001 ~ 1 s-1. The flow stress decreased with increasing temperature at a given strain rate, while it increased with increasing strain rate at a given deformation temperature. Exponential law, power exponential law and hyperbolic sine law were used to describe the hot deformation behavior, among which hyperbolic sine law fitted the best, and the liner regression coefficient reached 0. 974 484. The deformation activation energy decreased with increasing temperature. Conclusion The hot deformation behavior can be described by the hyperbolic sine law, and the deformation activation energy and stress exponent were calculated as 234. 0476 kJ / mol and 3. 860 86, respectively. |
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