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利用Gleeble-1500D热力模拟试验机,在温度为450~850℃、应变速率为0.001~1.000s-1、真应变量为0.7的条件下,对TiC含量为30%的TiC/Cu-Al2O3复合材料进行了热压缩试验,研究了其流变应力及本构方程。结果表明,材料的流变应力-应变曲线主要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,属于温度和应变速率敏感材料;在真应力-应变曲线基础上,建立的TiC/Cu-Al2O3复合材料高温本构模型可较好地表征其高温流变特征。
Using the Gleeble-1500D thermal simulation test machine, TiC / Cu-Al2O3 composite material with TiC content of 30% was obtained under the conditions of a temperature of 450 ~ 850 ℃, a strain rate of 0.001 ~ 1.000s-1 and a true strain of 0.7 Thermal compression tests were carried out to study the flow stress and constitutive equation. The results show that the rheological stress-strain curve of the material is mainly characterized by the dynamic recrystallization softening mechanism. The peak stress increases with the decrease of the deformation temperature or the strain rate, which is a sensitive material of temperature and strain rate. Based on the curves, the high temperature constitutive model of TiC / Cu-Al2O3 composites can be well characterized for its high temperature rheological properties.