作　　者： ; ; ; ; ; ;

机构地区： 河南科技大学材料科学与工程学院

出　　处： 《中国有色金属学报》 2012年第12期3462-3467,共6页

摘　　要： 在Gleeble 1500D热模拟机上对Al2O3/Cu-WC复合材料进行热压缩实验,研究变形温度为350-750℃、应变速率为0.01-5 s 1条件下的热变形行为。结果表明:Al2O3/Cu-WC复合材料高温流变应力—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;热变形过程中的稳态流变应力可用双曲正弦本构关系式来描述,其激活能为229.17 kJ/mol。根据材料动态模型,计算并建立Al2O3/Cu-WC复合材料的热加工图,据此确定热变形流变失稳区及热变形过程的最佳工艺参数,其热加工温度为650-750℃,应变速率为0.1-1 s 1。 The hot deformation behavior of A2O3/Cu-WC composites was investigated by compression tests on Gleeble 1500D thermal simulator.The tests were performed in the temperature range of 350 750 ℃ and strain rates of 0.01 5 s 1.The results show that A2O3/Cu-WC composite has the typical feature of the softening mechanism of dynamic recovery and dynamic recrystallization.The peak stress increases with decreasing the deformation temperature or increasing the strain rate.The flow behavior is described by the hyperbolic sine constitutive equation,and the activation energy of the composite is about 229.17 kJ/mol.The processing map was calculated and analyzed according to the dynamic materials model.The process of hot deformation in the temperature range and different strain rate can be attained by the map,of which the optimum hot deformation temperature ranges in 650 750 ℃ and strain rate ranges in 0.1 1 s 1,and the instability zones of flow behavior can also be recognized by the processing map.

关 键 词： 复合材料 热变形 流变应力方程 热加工图

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]