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采用Gleeble-1500热模拟实验机对Cu-0.90Cr-0.18Zr合金在变形温度为500~800℃、应变速率为0.01~1 s-1变形条件下进行热压缩变形实验,研究该合金的流变应力、本构方程及动态再结晶临界条件。结果表明:Cu-Cr-Zr合金的流变应力随变形温度的升高而降低,随应变速率的增加而增加,计算出该合金的热变形激活能为584.87 kJ/mol并构建本构方程;利用合金的lnθ-ε曲线出现拐点及-(lnθ)ε-ε曲线出现最小值来研究动态再结晶临界应变。
The hot deformation tests of Cu-0.90Cr-0.18Zr alloy at deformation temperature of 500 ~ 800 ℃ and strain rate of 0.01 ~ 1 s-1 were carried out by Gleeble-1500 thermal simulation machine. Stress, Constitutive Equation and Dynamic Recrystallization Critical Condition. The results show that the flow stress of Cu-Cr-Zr alloy decreases with the increase of deformation temperature and increases with the increase of strain rate. The thermal deformation activation energy of the alloy is calculated to be 584.87 kJ / mol and the constitutive equation is established. The critical point of dynamic recrystallization was studied by using the minimum value of lnθ-ε curve and the minimum value of - (lnθ) ε-ε curve.