Cu-Cr-Zr合金热变形行为

在Gleeble-1500D热模拟试验机上,采用高温等温压缩试验,在变形温度650~850℃、应变速率0.001~10 s~(-1)和总压缩应变量50%的条件下,对Cu-Cr-Zr合金的流变应力行为进行研究.通过应力-应变曲线和显微组织图分析了合金在不同应变速率、不同应变温度下的变化规律.结果表明:应变速率和变形温度对合金再结晶影响较大,变形温度越高,合金越容易发生动态再结晶;应变速率越小,合金也同样容易发生动态再结晶,并且对应的峰值应力也越小.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和流变应力方程.研究分析Cu-Cr-Zr合金的热加工性能,可为生产实践提供理论指导与借鉴.

Study on Hot Deformation of Cu-Cr-Zr Alloy

The flow stress behavior of Cu-Cr-Zr alloy during hot compression deformation was studied through making isothermal compression test at Gleeble-1500D thermal- mechanical simulator at the temperature from 650 ℃to 850 ℃, the strain rate from 0. 001 s-1 to 10 s ~ and under the maximum strain of 50%. The change of Cu-Cr-Zr alloy was observed under different deformation temperature and different strain rate, through flow stress-strain curve and microstructure graph. Test results show that the higher deformation temperature or the smaller strain rate is, the easier dynamic re-crystallization of the alloy will occur. At the same time, the corresponding peak stress value becomes smaller. Both the hot deformation activation energy Q and constitutive equation can be derived from the correlativity of flow stress, strain rate and temperature of this alloy. The study on Cu-Cr-Zr thermal processing figure can help analyze the thermal performance of Cu-Cr-Zr alloy, and it provides theoretical guidance and reference for production practice.