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利用Gleeble-1500D热模拟机在250~450℃、应变速率0.002~2 s~(-1)、变形量为50%的条件下对Mg-5.1Sn-1.5Y-0.4Zr合金进行高温压缩模拟试验。根据应力-应变曲线分析了该合金流变应力变化特点,建立了流变应力本构方程和动态再结晶晶粒尺寸模型。结果表明:该合金在高温压缩变形时,随应变速率的增大和变形温度的降低,峰值应力不断增大而动态再结晶晶粒尺寸不断减小。
The Gleeble-1500D thermal simulator was used to simulate the high temperature compression of Mg-5.1Sn-1.5Y-0.4Zr alloy at 250-450 ℃, strain rate of 0.002-2 s -1 and deformation of 50% . According to the stress-strain curve, the change characteristics of the flow stress of the alloy were analyzed, and the constitutive equation of flow stress and the dynamic recrystallization grain size model were established. The results show that with the increase of strain rate and deformation temperature, the peak stress increases and the dynamic recrystallization grain size decreases continuously at high temperature.