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在Gleeble 1500D热模拟机上对AZ40M镁合金在应变速率0.001~1 s-1、变形温度250~400℃下对热压缩变形行为进行研究。结果表明:AZ40镁合金热压缩变形的流变应力受到变形温度和应变速率的显著影响,可用Zener-Hollornon参数的双曲正弦函数形式进行描述。本实验条件下,AZ40M镁合金热压缩变形时的热变形激活能Q为161 kJ·mol-1,建立了流变应力的数学模型,其结果可为研究镁合金热变形特性及复杂形状零件的热锻成形工艺的制订提供指导。
The hot compression deformation behavior of AZ40M magnesium alloy was investigated on a Gleeble 1500D thermal simulator at a strain rate of 0.001-1 s-1 and a deformation temperature of 250-400 ℃. The results show that the flow stress of AZ40 magnesium alloy during hot compression deformation is significantly affected by the deformation temperature and strain rate. It can be described by the hyperbolic sine function of Zener-Hollornon parameter. Under the experimental conditions, the thermal deformation activation energy Q of AZ40M magnesium alloy during hot compression deformation is 161 kJ · mol-1, and a mathematical model of flow stress is established. The results can be used to study the thermal deformation characteristics of magnesium alloy and complex shape parts Hot forging forming process to provide guidance.