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采用Gleeble-1500热模拟实验机在温度为623～773 K,应变速率为0.001～1 s-1条件下对Mg-10Gd-4.8Y-2Zn-0.6Zr(wt%)合金进行热压缩实验,研究了该合金热变形行为及热加工特征,建立了该合金热变形时的本构方程和加工图。结果表明,该合金高温变形时的峰值应力随着应变速率的降低和变形温度的升高而显著减小;变形激活能为289.36 kJ/mol;合金高温变形时存在两个失稳区,分别是变形温度为770～773 K,应变速率为0.1 s-1左右的区域,和变形温度小于750 K,应变速率小于0.03s-1的区域;合金的最佳热加工温度为750～773 K,应变速率为0.001～0.01 s-1。
The hot compressive experiments of Mg-10Gd-4.8Y-2Zn-0.6Zr (wt%) alloy at temperatures of 623-773 K and strain rates of 0.001-1 s-1 were performed on a Gleeble-1500 thermal simulator. The thermal deformation behavior and thermal processing characteristics of the alloy were studied. The constitutive equation and the processing diagram of the alloy during thermal deformation were established. The results show that the peak stress at high temperature deformation decreases with the decrease of strain rate and deformation temperature. The deformation activation energy is 289.36 kJ / mol. There are two destabilization zones at high temperature deformation, which are The deformation temperature is 770 ~ 773 K, the strain rate is about 0.1 s-1, and the deformation temperature is less than 750 K and the strain rate is less than 0.03 s-1. The optimal hot working temperature is 750 ~ 773 K, strain The rate is 0.001 to 0.01 s-1.