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在温度T=250~450℃,应变速率为0.001~10s-1的条件下,利用Gleeble-3500热模拟试验机对挤压Mg-7.8%Li-4.6%Zn-0.96%Ce-0.85%Y-0.30Zr合金进行高温热压缩试验,分析流变应力曲线特点。合金的流变应力曲线表现出动态再结晶特征,动态再结晶是热变形过程中的主要软化机制。流变应力峰值随温度的降低和应变速率的增大而升高。稀土相化合物和α相促进β相的动态再结晶,使α相再结晶减缓。在热变形过程中动态再结晶迅速,流变应力曲线表现为临界应变较小,加工硬化迅速被动态软化所掩盖。
The microstructures of Mg-7.8% Li-4.6% Zn-0.96% Ce-0.85% Y-Zr alloy were investigated by Gleeble-3500 thermal simulator at a temperature of T = 250-450 ℃ and a strain rate of 0.001-10 s- 0.30Zr alloy hot compression test at high temperature, analysis of flow stress curve characteristics. The flow stress curves of the alloys show dynamic recrystallization. Dynamic recrystallization is the main softening mechanism during hot deformation. The peak value of flow stress increases with the decrease of temperature and strain rate. Rare earth phase compounds and α phase promote the dynamic recrystallization of β phase, so recrystallization α slow down. Dynamic thermal recrystallization in the hot deformation process quickly, the flow stress curve showed a small critical strain, work hardening quickly masked by dynamic softening.