采用Gleeble-1500D热模拟实验机,研究了Mg-3.5Zn-0.6Y-0.5Zr合金在变形温度为300～450℃、变形速率为0.002～1s-1及变形量为50％的条件下的高温压缩变形行为,分析了流变应力与应变速率、变形温度的关系,计算了高温变形时变形激活能和应力指数,建立了该合金的本构方程.结果表明:Mg-3.5Zn-0.6Y-0.5Zr合金在热变形过程中真应力随着温度的升高而降低,真应力随着应变速率的升高而升高.该合金的流动应力可以用双曲正弦函数来描述.
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