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在Gleeble-3500热模拟机上对Ti_2AlNb基合金进行了等温恒应变速率压缩实验,获得了该合金在应变速率为0.01~10 s-1、变形温度为900~1100℃时的流动应力,分析了热变形参数对流动应力的影响规律,计算了该合金的激活能。采用多元线性回归法建立了该合金的本构方程。误差分析表明,该本构方程具有较高的精度,可为Ti_2AlNb基合金在锻造过程中的数值模拟和制定热加工工艺参数提供理论依据。
In the Gleeble-3500 thermal simulator, the isothermal constant strain rate of Ti_2AlNb-based alloy was investigated. The flow stress of Ti_2AlNb-based alloy at strain rate of 0.01 ~ 10 s-1 and deformation temperature of 900 ~ 1100 ℃ was obtained. The effect of deformation parameters on the flow stress was calculated and the activation energy of the alloy was calculated. The constitutive equation of the alloy was established by multiple linear regression method. Error analysis shows that the constitutive equation has high accuracy and can provide theoretical basis for the numerical simulation of Ti_2AlNb based alloy in forging process and the development of thermal processing parameters.