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采用Gleeble/1500热模拟试验机,在变形温度300~420℃,应变速率0.0005~0.5s-1,最大变形量80%的变形条件下,对稀土镁合金合金进行等温恒应变速率压缩试验,研究了该合金的高温流动应力变化规律,并建立了应变补偿的材料热变形Arrhenius本构关系模型,并将经计算得到的结果与热模拟试验得到的应力应变曲线进行对比,结果比较吻合。考虑应变对流动应力的影响,确定了峰值应力、变形温度和应变速率之间的关系,并获得了变形激活能和本构方程中材料常数随应变的变化规律。
The Gleeble / 1500 thermal simulation testing machine was used to compress the isothermal constant strain rate of rare earth magnesium alloy under the conditions of deformation temperature of 300 ~ 420 ℃, strain rate of 0.0005 ~ 0.5s-1 and maximum deformation of 80% The variation law of the high temperature flow stress of the alloy was established and the Arrhenius constitutive model of strain-compensated material was established. The calculated results were compared with the stress-strain curves obtained by thermal simulation. The results are in good agreement. Considering the effect of strain on the flow stress, the relationship between peak stress, deformation temperature and strain rate was determined. The variation law of deformation constants and material constants with strain in the constitutive equation was obtained.