(吉林大学 南岭校区 材料科学与工程学院,长春 130025)
摘 要: 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350℃左右退火可获得最佳表面性能,显微硬度可达到 290HV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。
关键字: 纳米表面层;复合材料;耐磨性;相变
nanocrystalline Cu-Zn surface
(College of Materials Science and Engineering,Jilin University,
Changchun 130025,China)
Abstract:Copper-matrix composites with nanocrystalline Cu-Zn surface layer were obtained by using composite powder compacting process. The interface between matrix and surface layer,the nanocrystalline surface layer microstructure and phase transformation,and their effects on nanocrystalline surface were studied. It is shown that better interface bond can be obtained and nanocrystalline surface having the best property can be obtained after annealing at 350℃. The hardness of nanocrystalline surface is up to HV290 and the wear resistance property is better than that of the matrix. The precipitation of α phase from β′ phase can contribute to improving the property of Cu-Zn nanocrystalline surface layer .
Key words: nanocrystalline surface layer;composites;wear resistance;phase transformation