Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 125, Issue 18, Pages 9736-9746Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c00941
Keywords
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Funding
- National Natural Scientific Foundation of China [11772288, 12074326]
- Natural Science Foundation of Hunan Province, China [2020JJ1005]
- Innovation Team of Hunan Province, China [2018RS3091]
- Graduate Research and Innovation Project of Xiangtan University, China [XDCX2019B082]
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0001135]
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Through first-principles calculations based on density functional theory, the study reveals the impact of water vapor on the formation, migration, and aggregation of atomic defects in aluminum oxide phases during high-temperature oxidation. The atomic origins of water vapor in inducing faster alumina scale growth compared to dry oxygen are elucidated, suggesting ways to manipulate the oxidation kinetics of alumina-forming alloys by controlling oxidizing atmospheres.
Despite much effort directed at elucidating the impact of water vapor on the high-temperature oxidation behavior of metallic materials, a complete understanding of its atomistic mechanisms remains elusive. Using first-principles calculations based on the density functional theory, here we elucidate the effect of water vapor on the formation, migration, and aggregation of atomic defects in alpha-Al2O3, Al2O3, and theta-Al2O3, the three dominant aluminum oxide phases involved in the high-temperature oxidation of alumina-forming alloys. These results reveal the atomic origins of water vapor in inducing faster alumina scale growth compared with dry oxygen and suggest ways of manipulating the oxidation kinetics of alumina-forming alloys via controlling the oxidizing atmospheres.
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