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通过等温热压缩实验,综合研究1460铝锂合金在不同应变速率(10-3~10 s-1)和不同温度(573~773 K)下的热变形行为及其组织演变规律。通过考虑压板和样品界面的摩擦力和形变热导致的温度变化,对流变应力曲线进行校正。结合变形行为中的应变、应变速率和温度的影响,可以通过正弦关系中的Z参数来描述其变形行为,并根据动态回复、动态再结晶、T1相的溶解对峰值流变应力的影响,建立1460铝锂合金的本构方程。在所有应变速率和温度范围内,本构方程有效性验证表明,改进后的本构方程是可行有效的,其线性相关系数和相对误差分别为0.9909和6.72%。
The isothermal hot compression experiment was conducted to study the thermal deformation behavior and microstructure evolution of 1460 Al-Li alloy under different strain rates (10-3 ~ 10 s-1) and different temperatures (573 ~ 773 K). The flow stress curves were corrected by taking into account the frictional forces at the pressure plate and the sample interface and the temperature changes caused by the deformation heat. According to the influence of strain, strain rate and temperature on the deformation behavior, the deformation behavior can be described by Z parameter in the sinusoidal relationship. According to the influence of dynamic recovery, dynamic recrystallization and dissolution of T1 phase on the peak flow stress, Constitutive equation of 1460 Al-Li alloy. Validation of the constitutive equation shows that the improved constitutive equation is feasible and effective with linear correlation coefficient and relative error of 0.9909 and 6.72% at all strain rates and temperature ranges.