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在变形温度为380～500℃,应变速率为0.001～10 s-1的条件下,采用Gleeble-1500热模拟试验机对含钪Al-Cu-Li-Zr合金的热变形行为进行了研究。结果表明:含钪Al-Cu-Li-Zr合金流变应力随变形温度升高和应变速率的降低而减小;变形初期,应力值随应变的增加迅速提高,显示出明显的加工硬化效应。当应力值达到峰值后,随着变形增加,流变应力逐步降低,合金出现明显的软化现象。根据流变应力本构方程及利用作图法和线性回归方法求解得出各参数值,得出流变峰值应力方程;该合金在高温压缩试验中会发生动态回复,在一定条件下会发生动态再结晶,并且温度越高应变速率越低,该合金越易发生动态再结晶,从而表现出其流变应力越低。
The hot deformation behavior of Al-Cu-Li-Zr alloy with scandium was investigated by using Gleeble-1500 thermal simulator at a deformation temperature of 380-500 ℃ and a strain rate of 0.001-10 s-1. The results show that the flow stress of Al-Cu-Li-Zr alloy containing scandium decreases with the increase of deformation temperature and the decrease of strain rate. In the early stage of deformation, the stress value increases rapidly with the increase of strain, and shows obvious work-hardening effect. When the stress reaches its peak value, the flow stress decreases gradually as the deformation increases, and the alloy softens obviously. According to the rheological stress constitutive equation and the use of mapping and linear regression method to solve each parameter values obtained rheological peak stress equation; the alloy in the high temperature compression test will occur dynamic response, under certain conditions will occur dynamic Recrystallization, and the higher the temperature, the lower the strain rate, the more susceptible to recrystallization of the alloy and the lower the flow stress.