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Title: Non-compact oxide-island growth induced by surface phase transition of the intermetallic NiAl during vacuum annealing

Journal Article · · Acta Materialia

Crystal structure and composition are inter-dependent and decoupling their effects on surface reactivity is challenging. Using low-energy electron microscopy to spatially and temporally resolve the oxide film growth during the oxidation of NiAl(100), we differentiate such coupled effects by monitoring oxide growth while simultaneously fine-tuning the surface structure and composition during oxidation. We demonstrate that the oxidation of chemically ordered surfaces results in compact oxide island growth whereas non-compact oxide growth during the surface phase transition. By incorporating the surface phase transition induced chemical disordering into kinetic Monte Carlo simulations, we illustrate that the non-compact oxide growth is induced by the composition effect on the surface diffusion of oxygen, which can be described by the concept of “ant in the labyrinth”.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); State Univ. of New York (SUNY), Binghamton, NY (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001135; SC0012704
OSTI ID:
1760640
Report Number(s):
BNL--220802-2021-JAAM
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 201; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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