期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 844, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156014
关键词
High-entropy alloys; Corrosion; Microstructure; In-situ visualization; Metastable pitting
资金
- Shenzhen Science and Technology Research Funding [JCYJ20160608153641020]
- National Natural Science Foundation of China [51901242]
- China Postdoctoral Science Foundation [2018M643247]
- U.S. Department of Energy, Office of Fossil Energy, National Energy Technology Laboratory [DE-FE-0008855, DE-FE-0024054, DE-FE-0011194]
- National Science Foundation [DMR-1611180, 1809640]
- Beijing Municipal Natural Science Foundation [2162026]
In the present study, the corrosion behavior of the AlxCoCrFeNi (x = 0.3, 0.5, 0.7) high-entropy alloys (HEAs) is investigated by an in-situ visualization system. Surface morphology changes on both micro-spatial and temporal scales are monitored in the 3.5 wt% NaCl solution during the potentiodynamic polarization. The microstructures of the AlxCoCrFeNi HEAs are characterized by SEM, EBSD, and EDS. The results show that the microstructure evolves from singe face-centered cubic (FCC) phase to multi-phases by increasing the Al content. The in-situ observations directly reveal the different localized corrosion processes in the AlxCoCrFeNi HEAs. In the single FCC phase Al0.3CoCrFeNi HEA, localized corrosion shows in the form of pitting. In the Al0.5CoCrFeNi and Al0.7CoCrFeNi alloys, which possess FCC and body-centered cubic (BCC) phases, the localized corrosion initiates and propagates in the Cr-depleted BCC phase. In addition, the in-situ visualization uncovers the evolution of current serration, which represents the propagation and repassivation of metastable pit during the polarization. The frequent occurrence of metastable pits indicates distinct repassivation ability of the Al0.3CoCrFeNi HEA. (c) 2020 Published by Elsevier B.V.
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