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在Gleeble-1500D热模拟试验机上对Cu-Cr-Zr合金和Cu-Cr-Zr-Ce合金在应变速率为0.001~10 s-1、变形温度为650~850℃的高温变形过程中的流变应力行为进行了研究。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。从流变应力、应变速率和温度的相关性,利用逐步回归的方法建立了两种合金的流变应力方程。稀土元素Ce的加入能够细化Cu-Cr-Zr合金晶粒,而且能够促进Cu-Cr-Zr合金的动态再结晶。根据动态材料模型计算并分析了两种合金的热加工图,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,利用热加工图分析了两种合金不同区域的高温变形特征以及组织变化。对比分析后得出稀土元素Ce的加入能够优化Cu-Cr-Zr合金的热加工性能。
The rheology of Cu-Cr-Zr alloy and Cu-Cr-Zr-Ce alloy during high-temperature deformation at strain rate of 0.001-10 s-1 and deformation temperature of 650-850 ℃ on a Gleeble-1500D thermal simulator Stress behavior has been studied. The results show that the flow stress decreases with the increase of deformation temperature and increases with the increase of strain rate. Based on the correlation between flow stress, strain rate and temperature, the flow stress equations of the two alloys were established by means of stepwise regression. The addition of rare earth element Ce can refine the grains of Cu-Cr-Zr alloy and promote the dynamic recrystallization of Cu-Cr-Zr alloy. According to the dynamic material model, the hot working diagrams of the two alloys were calculated and analyzed. The hot deformation of the two alloys was determined by the hot working drawing. The optimal parameters of the hot deformation during the test parameters were obtained. The high temperature deformation characteristics and the microstructural changes in different regions of the two alloys were investigated. The comparative analysis shows that the addition of rare earth element Ce can optimize the hot workability of Cu-Cr-Zr alloy.