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采用Gleeble3800热模拟机对5182铝合金进行压缩变形试验,分析了该合金在变形温度350~480℃、应变速率0.001~1 s-1、工程变形量为66.6%条件下的流变应力变化规律。基于动态材料模型建立了5182铝合金的热变形本构方程和热加工图,确定了失稳区,得到5182铝合金热变形激活能Qdef=160.46 k J/mol;根据热加工图确定了最佳的热加工区间变形温度355~450℃,应变速率0.1~0.001 s-1。对安全区内热加工后5182铝合金组织的微观形貌进行了研究,为该合金的热加工工艺制定提供了依据。
The compressive deformation of 5182 aluminum alloy was investigated by Gleeble 3800 thermal simulator. The variation of rheological stress of the alloy was analyzed under the conditions of deformation temperature of 350 ~ 480 ℃, strain rate of 0.001 ~ 1 s-1 and engineering deformation of 66.6%. Based on the dynamic material model, the thermal deformation constitutive equation and hot working diagram of 5182 aluminum alloy were established, and the destabilization zone was determined. The thermal deformation activation energy of 5182 aluminum alloy was obtained as Qdef = 160.46 kJ / mol. The thermal processing range of deformation temperature 355 ~ 450 ℃, strain rate 0.1 ~ 0.001 s-1. The microstructure of 5182 aluminum alloy after hot working in the safe area was studied, which provided the basis for the hot processing technology of the alloy.