Cu-30Ni合金机械冲击表面纳米化组织和性能(英文)  

Surface nanocrystallization by mechanical punching process for improving microstructure and properties of Cu-30Ni alloy

作　　者：毛向阳[1] 李东阳[2] 王章忠[1] 赵秀明[1] 蔡璐[1] 

机构地区：[1]南京工程学院材料工程学院,南京211167 [2]阿尔伯塔大学化工与材料工程系

出　　处：《中国有色金属学会会刊：英文版》2013年第6期1694-1700,共7页Transactions of Nonferrous Metals Society of China

基　　金：Projects(YKJ201008,KXJ08135)supported by Scientific Research Startup Foundation for Introducing Talents of Nanjing Institute of Technology,China;Project(JHB2011-25)supported by the Industrialization of Scientific Research Promotion Projects of Colleges and Universities in Jiangsu Province,China;Project(CKJB201206)supported by Innovation Foundation of Nanjing Institute of Technology,China

摘　　要：采用大应力塑性变形(机械冲击)技术对Cu-30Ni合金表面进行纳米化处理。利用原子力显微镜技术、纳米压痕试样、显微硬度测量、电化学分析和电子功函数等手段分别测试原始样品、大应力塑性变形纳米化处理样品的晶粒尺寸、力学性能、腐蚀性能。结果表明,与原始样品相比,大应力塑性变形纳米化处理样品的表面晶粒尺寸达到40nm;力学性能显著改善。电化学测试表明,表面纳米化提高了合金的耐腐蚀性能,耐腐蚀性能变化与电子功函数变化一致。机械冲击工艺技术能够使Cu-30Ni合金表面纳米化,从而提高了表面力学性能和耐腐蚀性能。A punching process was employed to produce nanocrystalline on the surface of Cu?30Ni alloy. Compared with the original sample, corresponding changes of the grain size, mechanical properties and corrosion resistance of surface nanocrystalline induced by punching process were characterized by atomic force microscopy, nanoindentation, microhardness, electrochemical behavior and electron work function. It was observed that the grain size was about 40 nm in the topmost surface. The increasing mechanical properties were also demonstrated. Additionally, the dynamic polarization test showed that the surface nanocrystallization improved the resistance to electrochemical attacks. Such increasing corrosion resistance was identified with the higher EWF value. This study demonstrates that surface nanocrystallization can be generated by punching process, and thus mechanical properties and corrosion resistance of alloy can be improved.

关 键 词：Cu-30Ni合金 机械冲击 表面纳米化 力学性能 耐腐蚀性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]