纯铜表面纳米化对镍扩散的影响  

Effects of surface nanocrystallization on diffusion of nickel

作　　者：林万明[1] 卫英慧[1] 杜华云[1] 毕海香[1] 侯利锋[1] 

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《金属热处理》2009年第11期14-17,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(50471070);山西省留学回国人员科研资助项目(2006-32)

摘　　要：利用表面机械研磨处理(SMAT)在纯铜表面制备出纳米结构表层,并对其表面进行了电镀镍处理,采用扫描电子显微镜分析了镍原子在纳米晶铜中的扩散行为。结果表明:表面纳米晶层内存在有大量非平衡态缺陷和晶界,尤其是三叉晶界数量增加,降低了镍原子扩散的激活能,提高了其扩散系数,从而加快了镍原子的扩散。Nanostructured surface layer was synthesized on pure copper by using surface mechanical attrition treatment （SMAT）. The copper samples surface was cleaned and electroplated with a layer of pure nickel and scanning electron microscope （SEM）is used to analyze diffusion behavior of Ni atoms in the pure copper. Experimental results show that the increase of diffusion rate of Ni atoms is attributed to lower diffusion activation energy and higher diffusion coefficient, which induced by the non-equilibrium defects and grain boundary in nanocrystalline, especially, a large number of triple junction boundaries.

关 键 词：表面机械研磨处理 扩散 铜 表面纳米化 

分 类 号：TG178[金属学及工艺—金属表面处理]