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采用复合粉末加压成型的方法 ,在铜基体表面上复合了纳米Cu Zn合金表面层 ,获得了具有纳米结构表面层的铜基复合材料。对基体与表面的界面结构、纳米表面层的微观结构、相变特征及其对材料表面性能的影响进行了研究。结果表明 ,纳米表面层与基体结合良好 ,纳米表面层在经 35 0℃左右退火可获得最佳表面性能 ,显微硬度可达到 2 90HV左右 ,耐磨性明显优于基体材料。对纳米Cu Zn合金的相变过程分析表明 ,Cu Zn纳米晶体 β′相中弥散α相沉淀物的析出有助于强化纳米Cu Zn结构表层。
The surface of the Cu Cu alloy was compounded with the Cu Zn alloy surface layer by composite powder pressure forming method to obtain the Cu-based composite material with nanostructured surface layer. The interface structure between the substrate and the surface, the microstructure of the nano-surface layer, the phase transition characteristics and its influence on the surface properties of the material were studied. The results show that the nano-surface layer is well bonded with the substrate. The nano-surface layer can be annealed at about 35 0 ℃ to obtain the best surface properties. The micro-hardness can reach about 2 90 HV, and the wear resistance is obviously better than that of the matrix material. The analysis of the phase transition of nano-Cu-Zn alloy shows that the precipitation of dispersed α-phase precipitate in the β ’phase of Cu-Zn nanocrystals is helpful to strengthen the surface layer of Cu-Zn nano-structure.