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利用Gleeble-1500D热模拟机,在温度为550,650,750,850,900℃,应变速率为0.001,0.01,0.1,1,10 s~(-1)的条件下,对Cu-1%Zr-0.15%Ce合金的高温变形过程中的流变应力进行研究,分析了动态再结晶的演变机制。结果表明:变形温度和应变速率对合金的流变应力有显著的影响,在550~750℃之间具有典型的动态回复特征,850~900℃具有动态再结晶热变形特征。通过流变应力、应变速率和变形温度之间的关系,建立高温热变形流变应力本构方程,得到合金的热激活能为430.51 k J·mol~(-1),与纯铜热压缩变形过程相比,高Zr含量Cu-1%Zr-0.15%Ce合金热激活能提高了105%。
Using the Gleeble-1500D thermal simulator, the high temperature deformation of Cu-1% Zr-0.15% Ce alloy at temperatures of 550, 650, 750, 850 and 900 ℃ and strain rates of 0.001, 0.01, 0.1, 1 and 10 s ~ (-1) In the process of flow stress research, analysis of the dynamic recrystallization evolution mechanism. The results show that the deformation temperature and strain rate have a significant influence on the flow stress of the alloy, with typical dynamic recovery characteristics at 550-750 ℃, and dynamic recrystallization thermal deformation at 850-900 ℃. Through the relationship between flow stress, strain rate and deformation temperature, the constitutive equation of flow stress in high temperature hot deformation was established. The thermal activation energy of the alloy was 430.51 kJ · mol -1, The thermal activation energy of the Cu-1% Zr-0.15% Ce alloy with high Zr content increased by 105% compared with that of the Cu-1% Zr-0.15% Ce alloy.