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Title: In-situ visualization of corrosion behavior of Al CoCrFeNi high-entropy alloys during electrochemical polarization

Abstract

In this 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.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6]
+ Show Author Affiliations
  1. Chinese Academy of Sciences, Shenzhen (China)
  2. Fudan Univ., Shanghai (China)
  3. Univ. of Tennessee Space Inst. (UTSI), Tullahoma, TN (United States)
  4. Univ. of Science and Technology Beijing (China). Collaborative Innovation Center of Steel Technology
  5. Univ. of Tennessee, Knoxville, TN (United States)
  6. Chinese Academy of Sciences, Shenzhen (China). Shenzhen Insts. of Advanced Technology
Publication Date:
Research Org.:
Univ. of Tennessee, Knoxville, TN (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE); USDOE Office of Fossil Energy and Carbon Management (FECM)
OSTI Identifier:
1849107
Alternate Identifier(s):
OSTI ID: 1703744
Grant/Contract Number:  
FE0008855; FE0011194; FE0024054; FE-0008855; FE-0024054; FE-0011194; DMR-1611180; 1809640; 2162026
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 844; Journal Issue: C; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; 42 ENGINEERING; Chemistry; Materials Science; Metallurgy & Metallurgical Engineering; High-entropy alloys; Corrosion; Microstructure; In-situ visualization; Metastable pitting

Citation Formats

Shi, Yunzhu, Mo, Jingke, Zhang, Feng-Yuan, Yang, Bin, Liaw, Peter K., and Zhao, Ying. In-situ visualization of corrosion behavior of Al CoCrFeNi high-entropy alloys during electrochemical polarization. United States: N. p., 2020. Web. doi:10.1016/j.jallcom.2020.156014.
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Shi, Yunzhu, Mo, Jingke, Zhang, Feng-Yuan, Yang, Bin, Liaw, Peter K., & Zhao, Ying. In-situ visualization of corrosion behavior of Al CoCrFeNi high-entropy alloys during electrochemical polarization. United States. https://doi.org/10.1016/j.jallcom.2020.156014
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Shi, Yunzhu, Mo, Jingke, Zhang, Feng-Yuan, Yang, Bin, Liaw, Peter K., and Zhao, Ying. Wed . "In-situ visualization of corrosion behavior of Al CoCrFeNi high-entropy alloys during electrochemical polarization". United States. https://doi.org/10.1016/j.jallcom.2020.156014. https://www.osti.gov/servlets/purl/1849107.
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@article{osti_1849107,
title = {In-situ visualization of corrosion behavior of Al CoCrFeNi high-entropy alloys during electrochemical polarization},
author = {Shi, Yunzhu and Mo, Jingke and Zhang, Feng-Yuan and Yang, Bin and Liaw, Peter K. and Zhao, Ying},
abstractNote = {In this 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.},
doi = {10.1016/j.jallcom.2020.156014},
journal = {Journal of Alloys and Compounds},
number = C,
volume = 844,
place = {United States},
year = {Wed Jun 24 00:00:00 EDT 2020},
month = {Wed Jun 24 00:00:00 EDT 2020}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1016/j.jallcom.2020.156014
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