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在Gleeble1500热模拟机上对连续挤压铜母线在应变速率为0.01～1.0 s-1、变形温度300～700℃条件下进行高温等温热压缩试验,并探讨了其高温流变应力行为。结果表明:当温度大于或等于500℃时,铜母线高温流变应力曲线显示出较为明显的稳态流变曲线特征,且为典型的单峰动态软化曲线;在温度小于500℃时,稳态流变曲线特征不明显,材料较难以进入稳态流变。变形温度越高或应变速率越低,动态软化曲线特征越明显。用Zener-Hollomon参数的双曲正弦函数形式能较好地描述铜母线高温变形时的流变应力行为,其热变形激活能Q经计算为205.445 kJ/mol,Z方程为:Z=ε觶exp(205.445/RT)。
The high temperature isothermal compression test was carried out on Gleeble1500 thermal simulator at high strain rate of 0.01-1.0 s-1 and deformation temperature of 300-700 ℃. The high temperature flow stress behavior was also investigated. The results show that when the temperature is higher than or equal to 500 ℃, the rheological stress curve of copper busbar shows a more obvious characteristic of steady-state rheological curve and a typical unimodal dynamic softening curve. When the temperature is less than 500 ℃, the steady-state Rheological curve is not obvious, the material is more difficult to enter steady-state flow. The higher the deformation temperature or the lower the strain rate, the more obvious the dynamic softening curve characteristic. The hyperbolic sine function of Zener-Hollomon parameter can well describe the flow stress behavior of copper busbar under high temperature deformation. The thermal deformation activation energy, Q, is calculated as 205.445 kJ / mol and the Z equation is: Z = ε 觯 exp (205.445 / RT).