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First-Principles study of interface capture of Ni during high-temperature oxidation of NiCr alloys

Journal Article · · Applied Surface Science
The formation of precipitated phases of less reactive metals within an oxide scale during alloy oxidation can disrupt its structural integrity, significantly compromising the protective function of the oxide. To better understand this phenomenon, it is crucial to investigate the atomic-level diffusion mechanisms that drive precipitate formation. In this study, we employ first-principles calculations to examine the diffusion and aggregation of Ni atoms across the NiCr/Cr2O3 interface during the high-temperature oxidation of NiCr alloys. Our results reveal that, in the absence of Cr vacancies, Ni atoms predominantly remain within the NiCr substrate, with minimal migration toward the Cr2O3 layer. However, when Cr vacancies are present at both the NiCr/Cr2O3 interface and within the Cr2O3 bulk, Ni atoms exhibit a strong propensity to migrate from the NiCr substrate into the Cr2O3 bulk, where they aggregate into Ni-rich regions with a corundum structure. This study provides valuable atomic-level insights into the diffusion and aggregation of less-reactive metals at the alloy/oxide interface, enhancing our understanding of solute capture and its contribution to the degradation of oxidation resistance in alloys.
Research Organization:
State University of New York, Binghamton, NY (United States)
Sponsoring Organization:
National Natural Scientific Foundation of China; Postgraduate Scientific Research Innovation Project of Xiangtan University; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
SC0001135
OSTI ID:
3015864
Journal Information:
Applied Surface Science, Journal Name: Applied Surface Science Vol. 711; ISSN 0169-4332
Publisher:
Elsevier BVCopyright Statement
Country of Publication:
United States
Language:
English

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