摘要
在Gleeble-1500D热模拟机上采用等温压缩实验研究了Mg-7Gd-5Y-1Nd-0.5Zr合金的高温压缩变形行为,获得合金在温度为350～530℃、应变速率为0.005～5s-1条件下的流变应力曲线。对流变应力曲线进行了摩擦和变形热修正。通过摩擦与温升修正后的应力值,计算出了平均热激活能和应力指数,Q=262.608kJ/mol,n=3.745,分析得出了变形激活能随温度的变化规律。结合显微组织演变,合金的热锻初始温度应在500～530℃为宜。
The hot deformation behaviors of Mg-7Gd-5Y-1Nd-0.5Zr alloy were investigated by hot compression tests with Gleeble- 1500D thermal simulator. The flow stress curves in the temperature range of 350 - 530℃ and strain rate of 0. 005 - 5 s-1 were ob- tained. The flow stress curves were corrected in consideration of the friction and deformation. Deformation activation energy and stress exponent were calculated based on the corrected flow stress, which were 262. 608 kJ/mol and 3. 745, respectively, and the variation of deformation activation energy with temperature was discussed. The initial temperature range for hot-forging of the alloy was suggested to be 500 - 530 ℃.
出处
《精密成形工程》
2013年第4期1-6,共6页
Journal of Netshape Forming Engineering
关键词
稀土镁合金
热变形行为
变形激活能
微观组织
rare earth magnesium alloy
hot deformation behavior
deformation activation energy
microstrueture
