2060-T8E30铝锂合金的热变形行为及本构模型研究

Study on Hot Deformation Behavior and Constitutive Model of 2060-T8E30 Al-Li Alloy

摘要:

利用Sans CMT4104型电子万能实验机进行等温恒应变速率热拉伸试验,研究了2060-T8E30铝锂合金在变形温度425~500 ℃、应变速率0.001~0.1 s_^-1条件下的热变形行为。结果表明：2060-T8E30铝锂合金在热变形过程中,随着温度的升高和应变速率的降低,其峰值应力降低。合金的平均变形激活能为240.502 kJ/mol,平均应变速率敏感指数为0.28。基于热拉伸试验的真应力-真应变曲线,建立了具有应变补偿的Arrhenius本构方程,模型的预测值与实验值平均相对误差5.89%,模型的精确度较好。

Abstract:

The thermal deformation behavior of 2060-T8E30 aluminum-lithium alloy at deformation temperature of 425 ~ 500 ℃ and strain rate of 0.001 ~ 0.1 s_^-1 was studied by using SansCMT4104 electronic universal experimental machine.The results show that the peak stress of 2060-T8E30 aluminum-lithium alloy decreases with the increase of temperature and the decrease of strain rate during thermal deformation.The average deformation activation energy of the alloy was 240.502kJ/mol, and the average strain rate sensitivity index was 0.28.Based on the true stress-true strain curve of the thermal tensile test, the Arrhenius constitutive equation with strain compensation was established. The average relative error between the predicted value and the experimental value of the model was 5.89%, showing a good accuracy of the model.