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对Ti-5Mo-5V-2C r-3A l钛合金进行等温压缩实验,变形温度范围为923~1123 K,应变速率为0.001~1 s-1。分析表明该材料的流变应力对温度与应变速率敏感:当变形温度为923~1023 K时,流变应力曲线呈现动态再结晶曲线特征;当变形温度为1073 K时,低应变速率(0.001 s-1)的流变应力曲线呈现动态再结晶曲线特征,高应变速率(0.01~1 s-1)的流变应力曲线呈现动态回复曲线特征;当变形温度为1123 K时,流变应力曲线呈现动态回复曲线特征;峰值流变应力随着变形温度的升高而下降,且下降速率随着温度升高而降低;峰值流变应力随着应变速率的升高而升高,升高速率在923~1023 K范围内随着应变速率升高而下降,在1073 K时随着应变速率升高而升高,在1123 K时随着应变速率升高无变化。Ti-5Mo-5V-2C r-3A l钛合金在等温压缩变形时的流变行为可用包含Zener-Holomon参数的Arrhen ius本构方程描述,变形激活能为789 k.Jmol-1。
The isothermal compression tests of Ti-5Mo-5V-2C r-3A l titanium alloy were carried out. The deformation temperature range was 923 ~ 1123 K and the strain rate was 0.001 ~ 1 s-1. The results show that the flow stress of the material is sensitive to the temperature and strain rate. When the deformation temperature is 923 ~ 1023 K, the dynamic strain curve shows the dynamic recrystallization curve. When the deformation temperature is 1073 K, the strain rate is 0.001 s -1), the dynamic stress-strain curves show the characteristics of dynamic recrystallization curve. The flow stress curves of high strain rate (0.01 ~ 1 s-1) show dynamic recovery curves. When the deformation temperature is 1123 K, the flow stress curves show Dynamic response curve characteristics; peak flow stress decreases with the increase of deformation temperature, and the rate of decline decreases with increasing temperature; peak flow stress increases with the increase of strain rate, the rate of increase of 923 ~ 1023 K, the strain decreases with increasing strain rate, and increases with strain rate at 1073 K, with no change at 1123 K with increasing strain rate. The rheological behavior of Ti-5Mo-5V-2C r-3A l titanium alloy under isothermal compressive deformation can be described by the Arrhen ius constitutive equation including the Zener-Holomon parameter with a deformation activation energy of 789 kJmol -1.