在温度T=250～450℃,应变速率为0.001～10 s-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.
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