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利用Gleeble-1500D热模拟试验机对Cu-Cr-Zr和Cu-Cr-Zr-Y合金,进行高温等温压缩试验,研究了在变形温度为650~850℃、应变速率为0.001~10 s-1条件下两种合金的流变应力的变化规律,测定了真应力一应变曲线,从流变应力、应变速率和温度的相关性,得出了该合金热压缩变形时的热变形激活能Q和本构方程,并利用光学显微镜分析了合金在热压缩过程中的组织演变及动态再结晶机制。结果表明:稀土元素Y的加入细化了微观组织,提高了Cu-Cr-Zr合金的动态再结晶体积分数,并且大幅降低了合金的热变形激活能Q,改善了其热加工性能。
The high-temperature isothermal compression tests of Cu-Cr-Zr and Cu-Cr-Zr-Y alloys were carried out on a Gleeble-1500D thermal simulation tester at a deformation temperature of 650 to 850 ° C and a strain rate of 0.001 to 10 s-1 The dynamic stress-strain curves of the two alloys were measured. The true stress-strain curve was obtained. From the correlation between the flow stress, strain rate and temperature, the hot deformation activation energy Q Constitutive equation, and the microstructure evolution and dynamic recrystallization mechanism of the alloy during hot compression were analyzed by optical microscope. The results show that the addition of rare earth element Y can refine the microstructure and increase the dynamic recrystallization volume fraction of Cu-Cr-Zr alloy, and greatly reduce the hot deformation activation energy Q of the alloy and improve its hot workability.