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在 Gleeble- 15 0 0热模拟机上对 2 5 19铝合金进行等温热压缩实验 ,变形温度为 30 0～ 5 0 0℃ ,应变速率为0 .0 5～ 2 5 s- 1 ,研究其热压缩变形的流变应力行为。结果表明 :2 5 19铝合金真应力 -应变曲线在低应变速率 (ε<2 5 s- 1 )条件下 ,流变应力开始随应变增加而增大 ,达到峰值后趋于平稳 ,表现出动态回复特征 ;而在高应变速率 (ε≥ 2 5 s- 1 )条件下 ,应力出现锯齿波动达到峰值后逐渐下降 ,表现出不连续再结晶特征。在用 Arrhenius方程描述 2 5 19铝合金热变形行为时 ,其变形激活能 Q为 16 7.81k J/ mol
In the Gleeble-1500 thermal simulator, the isothermal compression experiments of 2519 aluminum alloy were carried out at a deformation temperature of 30 0 ~ 5000 ℃ and a strain rate of 0.05 ~ 25 s-1. The effects of heat Flow stress behavior of compression deformation. The results show that the true stress-strain curve of 2 5 19 aluminum alloy increases with the increase of strain at low strain rate (ε <2 5 s-1), reaches the peak and then tends to be steady, Dynamic response characteristics. However, under the condition of high strain rate (ε≥25s-1), the stress sawtooth fluctuations peaked and then decreased gradually, indicating discontinuous recrystallization. In the Arrhenius equation describing the hot deformation behavior of 2 5 19 aluminum alloy, the deformation activation energy Q is 16 7.81 kJ / mol