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在单向压缩热模拟试验机上对AZ31-1Sm合金在变形温度为300~450℃、应变速率为0.01~1 s-1条件下的热变形行为和微观组织进行研究。结果表明:AZ31-1Sm镁合金在热压缩变形时,流变应力随着应变速率的增大和变形温度的降低而增大;该合金的热压缩流变应力行为可用双曲正弦形式的本构方程来描述,在本实验条件下,AZ31-1Sm镁合金热热变形激活能Q为160.8 k J/mol。AZ31-1Sm易发生动态再结晶,在高变形温度和低应变速率条件下动态再结晶趋势明显,动态再结晶晶粒尺寸随着变形温度的增加和应变速率的降低而增大。
The hot deformation behavior and microstructure of AZ31-1Sm alloy at deformation temperature of 300 ~ 450 ℃ and strain rate of 0.01 ~ 1 s-1 were studied on uniaxial compression heat simulation machine. The results show that the flow stress of AZ31-1Sm magnesium alloy increases with the increase of strain rate and deformation temperature during hot compression deformation. The flow stress behavior of AZ31-1Sm magnesium alloy can be expressed by the hyperbolic sine constitutive equation To describe, under the experimental conditions, the thermal deformation activation energy Q of AZ31-1Sm magnesium alloy is 160.8 kJ / mol. The dynamic recrystallization of AZ31-1Sm tends to occur. The dynamic recrystallization tendency is obvious under high deformation temperature and low strain rate. The dynamic recrystallization grain size increases with the increase of deformation temperature and strain rate.