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为研究Mg-9Li-3Al-1.6Y合金的热变形行为,利用Gleeble-1500D型热模拟试验机,在变形温度为200~350℃、应变速率为0.001~1 s~(-1)条件下,对挤压态Mg-9Li-3Al-1.6Y合金进行热力模拟实验。通过研究该合金的真应力-真应变曲线,分析合金的双曲线正弦函数表征的本构方程和热加工性。结果表明:材料的流变应力随应变速率的增加而增加,随温度的升高而下降;用双曲正弦函数能很好地表示材料在热变形中的稳态流变应力。分析热加工图可以看出:较佳的理论热加工区为220~270℃,0.05~0.001 s~(-1);超塑性加工区域为300~350℃,0.015~0.16 s~(-1)。
In order to study the thermal deformation behavior of Mg-9Li-3Al-1.6Y alloy, the hot deformation behavior of Mg-9Li-3Al-1.6Y alloy was studied by using Gleeble-1500D thermal simulation tester at deformation temperature of 200-350 ℃ and strain rate of 0.001-1 s -1. The thermomechanical simulation of Mg-9Li-3Al-1.6Y alloy was carried out. By studying the true stress-true strain curve of the alloy, the constitutive equation and hot workability of the alloy were characterized by hyperbolic sine function. The results show that the flow stress of the material increases with the increase of strain rate and decreases with the increase of temperature. The hyperbolic sine function can well represent the steady-state flow stress of the material in thermal deformation. According to the analysis of hot working drawing, the best theoretical hot working zone is 220 ~ 270 ℃, 0.05 ~ 0.001 s ~ (-1), the superplasticity processing zone is 300 ~ 350 ℃, 0.015 ~ 0.16 s ~ (-1) .