Transactions of Materials and Heat Treatment

Title：Ultrafine grained copper sheet prepared by constrained groove pressing and its corrosion resistance

Authors： Wang Zongshen Guan Yanjin Cui Weichun Fang Xiaoying Pan Yaokun

Unit： Shandong University of Technology Shandong University

KeyWords： constrained groove pressing severe plastic deformation copper sheets corrosion resistance deformation homogeneity

ClassificationCode：TG113；TG146

year,vol(issue):pagenumber：2018,43(6):142-146

Abstract：

Ultrafine grained copper sheets were prepared by constrained groove pressing, and the influences of pass number on microstructure, mechanical properties and deformation homogeneity of copper were studied. The corrosion resistance of copper sheets before and after constrained groove pressing was studied by Tafel extrapolation method, potentialtime curve and immersion corrosion tests. The result shows that the microstructure of copper is effectively refined by constrained groove pressing, and its mechanical properties are improved. After three passes, the grain size of copper is refined to about 500 nm from the annealed 30 μm, and the average microhardness increases from 41.4 HV to 82.5 HV. Thus, the deformation homogeneity is greatly improved. In addition, the analysis results of electrochemical and immersion corrosion tests reveal that the corrosion resistance of copper sheets processed by constrained groove pressing is determined by both grain size effect and homogeneity of plastic deformation, and the influence of deformation homogeneity is more remarkable. Furthermore, with the increase of pass number, the local corrosion of copper sheets is gradually eased, and the corrosion process is more homogeneous. In the end, the corrosion resistance is enhanced to a certain degree.

Funds：

国家自然科学基金资助项目（51605266）;山东省中青年科学家科研奖励基金项目（ZR2016EMB22）

王宗申（1986-），男，博士，讲师；Email：wangzsh@sdut.edu.cn

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