非真空熔铸Cu-Cr-Zr合金的热变形行为及动态再结晶临界条件

Thermal Deformation Behavior and Critical Conditions of Dynamic Recrystallization of Cu-Cr-Zr Alloy Melted under Non-vacuum Condition

采用Gleeble．1500热模拟实验机对Cu．0．90Cr-0．18Zr合金在变形温度为500～800℃、应变速率为0.01～1s^-1变形条件下进行热压缩变形实验，研究该合金的流变应力、本构方程及动态再结晶临界条件。结果表明：Cu．Cr—Zr合金的流变应力随变形温度的升高而降低，随应变速率的增加而增加，计算出该合金的热变形激活能为584．87kJ／mol并构建本构方程；利用合金的1nθ-ε曲线出现拐点及-（1θ-ε）／ε·ε曲线出现最小值来研究动态再结晶临界应变。

The thermal deformation tests of Cu-0.90Cr-0.18Zr alloy were conducted at the deformation temperature of 500-800 ℃ and the strain rate of 0.01-1 s-1 on the Gleeble-1500 thermal-mechanical simulator. The flow stress, the constitutive equation and the critical conditions of dynamic recrystallization were studied. The results show that the flow stress decreases with the increasing of deformation temperature or with the decreasing of strain rate, The constitutive equation was established with the activation energy 584.87 kJ/mol. The critical strain of dynamic recrystallization was studied by inflection point of 1nθ-ε curve and minimum value of -（1nθ-ε）/ε-ε curve.