采用真空热压-内氧化烧结法制备了TiC(30vol％)/Cu-Al2O3复合材料,测试其基本性能,对其微观组织进行了观察分析.利用Gleeble-1500D热力模拟试验机,在变形温度450～850℃、应变速率0.001～1 s-1、变形量50％的条件下,对TiC(30 vol％)/Cu-Al2O3进行了热压缩变形试验.通过对流变应力进行分析和计算,构建了该复合材料的本构方程及动态再结晶临界应变模型.利用加工硬化率-应变曲线的拐点和对应偏导曲线最小值的判据,建立了动态再结晶临界应变与Zener-Hollomon参数之间的函数关系.结果表明:TiC(30vol％)/Cu-Al2O3复合材料的真应力-真应变曲线以动态再结晶软化机制为特征,峰值应力随变形温度的降低或应变速率的升高而增加;计算得出该复合材料的热变形激活能为211.384 kJ/mol.
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