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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。
The mechanical properties of Mg-3.5Zn-0.6Y-0.5Zr alloy under the conditions of deformation temperature of 300-450 ℃, deformation rate of 0.002-1s-1 and deformation of 50% were studied by using Gleeble-1500D thermal simulation machine. The relationship between flow stress and strain rate and deformation temperature was analyzed. The deformation activation energy and stress index at high temperature deformation were calculated, and the constitutive equation of the alloy was established. The results show that the true stress of Mg-3.5Zn-0.6Y-0.5Zr alloy decreases with the increase of temperature and the true stress increases with the increase of strain rate. The flow stress of this alloy can be described by the hyperbolic sine function.