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采用Gleeble-1500热模拟机对ZK60镁合金在温度为200~400℃、应变速率为0.001~10 s-1、最大变形量为60%的条件下进行恒应变速率高温压缩实验,研究高温变形过程中合金的动态再结晶行为;采用EM模型描述合金的动态回复曲线,以此为基础,得出ZK60合金热压缩过程中的动态再结晶动力学Avrami方程。利用有限元模拟合金热压缩过程中的动态再结晶。结果表明:ZK60合金热压缩过程中由于存在动态再结晶的软化作用,流变应力达到峰值后逐渐减小,并最终达到稳态;随着变形量的增加和变形温度的升高,动态再结晶体积分数增加,合金变形更加均匀;随着应变速率的增加,动态再结晶分数有所减小,且变形也更不均匀。
ZKL60 magnesium alloy was subjected to high strain rate high temperature compression experiment with Gleeble-1500 thermal simulator at a temperature of 200-400 ℃, a strain rate of 0.001-10 s-1 and a maximum deformation of 60% The dynamic recrystallization behavior of ZK60 alloy was investigated by using EM model. Based on this, the dynamic recrystallization kinetics of Avrami equation in ZK60 alloy was obtained. Dynamic Recrystallization in Hot Compression of Alloy by Finite Element Method. The results show that due to the softening effect of dynamic recrystallization during hot compression, the flow stress decreases and then reaches the steady state. With the increase of the deformation and the increase of the deformation temperature, the dynamic recrystallization The integral number increases and the deformation of the alloy becomes more uniform. With the increase of strain rate, the dynamic recrystallization fraction decreases and the deformation is more uneven.