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采用真空热压烧结工艺成功制备WC体积分数为0、10%、20%的弥散铜-WC复合材料,分析了其显微组织和性能;并利用Gleeble-1500D热力模拟试验机,研究了该复合材料在变形温度为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:复合材料的相对密度在95%以上,随着WC含量的增加,其导电率下降、硬度升高。弥散铜-WC复合材料高温流变应力-应变曲线主要以动态再结晶机制为特征,峰值应力随变形温度的降低或应变速率的升高而增加;高温变形条件下弥散铜-WC复合材料流变应力本构方程可以用双曲线正弦方程和Z参数描述;其热变形激活能分别为193.81,208.35和229.17 kJ/mol。
The WC-WC composite material with WC volume fraction of 0, 10% and 20% was successfully prepared by vacuum hot-pressing sintering process. The microstructure and properties of WC-WC composites were analyzed. The properties of the composites were analyzed by Gleeble- The thermal deformation behavior of the material under the conditions of deformation temperature of 350-750 ℃ and strain rate of 0.01-5 s-1. The results show that the relative density of the composites is over 95%. With the increase of WC content, the electrical conductivity decreases and the hardness increases. The high temperature rheological stress-strain curves of dispersed Cu-WC composites are mainly characterized by the dynamic recrystallization mechanism, and the peak stress increases with the decrease of the deformation temperature or the strain rate. The rheological behavior of the diffused copper-WC composites under high temperature deformation Constitutive equations of stress can be described by the hyperbolic sine equation and the Z-parameter; their thermal deformation activation energies are 193.81, 208.35 and 229.17 kJ / mol, respectively.