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采用Gleeble-3500热模拟试验机对6061铝合金进行等温热压缩试验,研究变形温度为300~450℃、应变速率为0.01~10s-1、压缩量为60%条件下合金的热变形特性,分析其高温流变应力行为,依据动态材料模型建立热加工图并结合热变形组织分析6061铝合金的热变形机制。结果表明,6061铝合金流变应力随变形温度的升高和应变速率的降低而下降,其高温软化机制以动态回复为主;合金在高应变速率下普遍存在流变失稳,最佳热加工区间变形温度为430~450℃,应变速率为0.01~0.05 s~(-1),该工艺范围内合金出现了部分动态再结晶组织。
The isothermal hot compression tests of 6061 aluminum alloy were carried out on a Gleeble-3500 thermal simulator to study the thermal deformation properties of the alloy under the conditions of deformation temperature of 300-450 ℃, strain rate of 0.01-10s-1 and compression amount of 60% The hot deformation behavior of 6061 aluminum alloy was analyzed based on the dynamic material model and the thermal deformation microstructure of the 6061 aluminum alloy. The results show that the flow stress of 6061 aluminum alloy decreases with the increase of deformation temperature and strain rate, and its high temperature softening mechanism is dominated by dynamic recovery. The rheological instability of alloy 6061 is prevalent at high strain rate, and the optimum hot working The range of deformation temperature is 430-450 ℃ and the strain rate is 0.01-0.05 s ~ (-1). Some dynamic recrystallization structure appears in the alloy.