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.
出处
《中国有色金属学会会刊：英文版》
CSCD
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
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
Cu-30Ni alloy
mechanical punching
surface nanocrystallization
mechanical properties
corrosion resistance
