Cu-Cr-Zr-Ce合金高温热压缩变形行为及加工图

Hot compression deformation of Cu-Cr-Zr-Ce alloy and processing maps

在Gleeble-1500D热模拟试验机上，通过高温等温压缩试验，对Cu-Cr-Zr-Ce合金在应变速率为0.01~5 s-1、变形温度为600~800℃的组织转变以及动态再结晶行为进行了研究。结果表明：流变应力随变形温度的升高而减小，随应变速率的提高而增大。同时从流变应力、应变速率和温度的相关性，得出了该合金高温热压缩变形时的热变形激活能Q为495.8 kJ/mol，利用逐步回归的方法建立了该合金的流变应力方程。根据动态材料模型计算并分析了该合金的热加工图，利用热加工图确定热变形的流变失稳区，并且获得了试验参数范围内热变形过程的最佳工艺参数，温度为750-800℃，应变速率范围为0.01-0.1 s-1，并利用热加工图分析了该合金不同区域的高温变性特征以及组织变化。

The high temperature deformation and dynamic recrystallization behavior of Cu-Cr-Zr-Ce alloy at 0.01-5 s-1 and 600-800℃were performed on Gleeble-1500D. The results show that the flow stress decreases with the increase of temperature while increases with the increase of strain rate. The hot deformation activation energy Q=495.8 kJ/mol and constitutive equation are obtained from the correlativity of flow stress, strain rate and temperature by stepwise regression analysis. With consideration of the effects of the deformation temperatures and the stain rates, the processing maps are established based on the dynamic material model. The instability zones of flow behavior can be recognized by the plans. The optimum processing parameters of hot deformation in the range of this experiment can also be attained by the plans, in which the hot temperature is 750-800℃and the strain rate is 0.01-0.1 s-1. The hot deformation characteristics and microstructures are also analyzed by the processing maps.