期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 34, 期 10, 页码 1781-1790出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2018.03.021
关键词
Medium-entropy alloy; Nitrogen; Pitting corrosion; Passive film; Metastable pitting
资金
- National Natural Science Foundation of China [51434004, U1435205, 51774074]
- Transformation Project of Major Scientific and Technological Achievements in Shenyang [Z17-5-003]
A novel high nitrogen medium-entropy alloy CrCoNiN, which had higher strength and slightly lower ductility than CrCoNi alloy, was successfully manufactured by pressurized metallurgy. The microstructure and corrosion behaviour were investigated by microscopic, electrochemical and spectroscopic methods. The results indicated that nitrogen existed in the form of Cr2N precipitates and uniformly distributed N atoms, and nitrogen alloying significantly refined the grain size. Besides, nitrogen enriched on the outmost surface of passive film and metal/film interface as ammonia (NH3 and NH4+) and CrN, respectively. The significant improvement of corrosion resistance of CrCoNiN was attributed to the lower metastable pitting susceptibility together with thicker, less defective and more compact passive film. (C) 2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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