采用Gleeble-3500热模拟试验机研究Mg-5Sn-2.5Pb镁合金在变形温度250 ～ 450℃、应变速率为0.001 ～10 s-1条件下的热压缩变形行为,并基于动态材料模型(DMM)建立了Mg-5Sn-2.5Pb镁合金在应变为0.6时的热加工图.结果表明,Mg-5Sn-2.5Pb镁合金的高温流变应力对应变速率和温度的变化敏感,随变形温度的降低和应变速率的增大而增大;Mg-5Sn-2.5Pb镁合金的最佳加工区域:变形温度为375～450℃、应变速率为0.01 ～0.3 s-1.在此区域Mg-5Sn-2.5Pb镁合金的显微组织为动态再结晶组织.
Compressive deformation behavior of Mg-5Sn-2.5Pb magnesium alloy was investigated at the temperature range from 250 to 450 ℃ and strain rate range from O.001 to 10 s-1 on a Gleeble-3500 thermal simulator.The processing map of the alloy at a strain of 0.6 was established based on dynamic materials model (DMM).The results show that the flow stress of the alloy is sensitive to strain rate and temperature,the flow stress increases with decreasing the deformation temperature and increasing the strain rate.The optimum hot working parameters for the magnesium alloy are deformation temperature of 370-450 ℃ and strain rates of O.01-0.3 s-1,and the dynamically recrystallized homogeneous microstructure of the alloy is obtained.
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