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在Gleeble-1500热模拟机上对Al-Mn-Mg-RE合金进行等温热压缩试验,变形温度300～500℃,应变速率0.01～10s-1。结果表明:Al-Mn-Mg-RE合金流变应力均随应变的增加而迅速增大至峰值,之后随应变的增加而呈不同程度的减小。峰值应力随着变形温度的升高和应变速率的降低而逐渐减小;采用Zener-Hollomon模型和温度补偿的应变速率因子Z参数值的双曲正弦模型来描述该合金热压缩变形流变应力行为,其热变形激活能为186.482kJ/mol;在高Z值条件下的变形组织是拉长晶的亚晶内存在大量位错,而在低Z值条件下再结晶组织内形成了完整的亚晶结构。
The Al-Mn-Mg-RE alloy was subjected to isothermal hot compression tests on a Gleeble-1500 thermal simulator at a deformation temperature of 300-500 ° C and a strain rate of 0.01-10 s-1. The results show that the flow stress of Al-Mn-Mg-RE alloy rapidly increases to the peak value with the increase of strain, and then decreases with the increase of strain. The peak stress decreases with the increasing of the deformation temperature and the decrease of the strain rate. The hyperbolic sine model of the Zener-Hollomon model and the temperature-compensated strain rate factor Z parameter are used to describe the stress-strain behavior of the alloy during hot compression deformation , And its thermal deformation activation energy is 186.482 kJ / mol. Under the high Z value, the deformed structure is a large number of dislocations in the elongated crystal and a complete sub-structure is formed in the low Z value Crystal structure.