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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0.0005~0.5 s-1,对铸态稀土AZ80合金进行高温热压缩试验,研究了该合金的高温流动应力应变变化规律,并建立了应变补偿的材料热变形Arrhenius本构关系模型。将计算结果与热模拟实验得到的应力应变曲线进行对比,结果比较吻合。鉴于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 hot compressive test of as-cast AZ80 alloy was carried out with Gleeble / 1500 thermal simulator at deformation temperature of 300-420 ℃ and strain rate of 0.0005-0.5 s-1. The variation of stress and strain at high temperature was studied. The strain-compensated Arrhenius constitutive model of the material was established. The calculated results are compared with the stress-strain curves obtained by thermal simulation. The results are in good agreement. In view of the influence of strain on the flow stress, the relationship between peak stress, deformation temperature and strain rate was determined and the variation law of deformation constants and material constants with strain in the constitutive equation was obtained.