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Title: Vacancy ordering during selective oxidation of β-NiAl

Abstract

ß-NiAl is widely used as a protective coating for high-temperature corrosion, where the selective oxidation of Al leads to the formation of a thin alumina scale to prevent further oxidation. Furthermore, understanding how the selective oxidation couples to the structural and chemical evolution of the base alloy remains largely unexplored. Here, by using in-situ environmental transmission electron microscopy and density functional theory calculations, we reveal at the atomic scale that the selective oxidation of Al is accompanied by injection of vacancies into the bulk lattice. In particular, we discovered that during the layer-by-layer oxidation process, the injected vacancies preferentially cluster along <1 1 0> directions on the (0 0 1) planes of ß-NiAl, leading to the formation of band-like structural features. This finding sheds lights on the atomic mechanism of oxidation in ß-NiAl, which may also extend to the selective oxidation of other ordered intermetallic alloys.

Authors:
; ; ; ; ORCiD logo; ; ; ORCiD logo
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
OSTI Identifier:
1634273
Alternate Identifier(s):
OSTI ID: 1646599
Report Number(s):
PNNL-SA-152347
Journal ID: ISSN 2589-1529; S258915292030199X; 100783; PII: S258915292030199X
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Published Article
Journal Name:
Materialia
Additional Journal Information:
Journal Name: Materialia Journal Volume: 12 Journal Issue: C; Journal ID: ISSN 2589-1529
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
36 MATERIALS SCIENCE; Β-NiAl; In-situ ETEM; Selective oxidation; Vacancy injection; Ordering

Citation Formats

He, Yang, Luo, Langli, Sushko, Maria L., Liu, Can, Baer, Donald R., Schreiber, Daniel K., Rosso, Kevin M., and Wang, Chongmin. Vacancy ordering during selective oxidation of β-NiAl. Netherlands: N. p., 2020. Web. https://doi.org/10.1016/j.mtla.2020.100783.
He, Yang, Luo, Langli, Sushko, Maria L., Liu, Can, Baer, Donald R., Schreiber, Daniel K., Rosso, Kevin M., & Wang, Chongmin. Vacancy ordering during selective oxidation of β-NiAl. Netherlands. https://doi.org/10.1016/j.mtla.2020.100783
He, Yang, Luo, Langli, Sushko, Maria L., Liu, Can, Baer, Donald R., Schreiber, Daniel K., Rosso, Kevin M., and Wang, Chongmin. Sat . "Vacancy ordering during selective oxidation of β-NiAl". Netherlands. https://doi.org/10.1016/j.mtla.2020.100783.
@article{osti_1634273,
title = {Vacancy ordering during selective oxidation of β-NiAl},
author = {He, Yang and Luo, Langli and Sushko, Maria L. and Liu, Can and Baer, Donald R. and Schreiber, Daniel K. and Rosso, Kevin M. and Wang, Chongmin},
abstractNote = {ß-NiAl is widely used as a protective coating for high-temperature corrosion, where the selective oxidation of Al leads to the formation of a thin alumina scale to prevent further oxidation. Furthermore, understanding how the selective oxidation couples to the structural and chemical evolution of the base alloy remains largely unexplored. Here, by using in-situ environmental transmission electron microscopy and density functional theory calculations, we reveal at the atomic scale that the selective oxidation of Al is accompanied by injection of vacancies into the bulk lattice. In particular, we discovered that during the layer-by-layer oxidation process, the injected vacancies preferentially cluster along <1 1 0> directions on the (0 0 1) planes of ß-NiAl, leading to the formation of band-like structural features. This finding sheds lights on the atomic mechanism of oxidation in ß-NiAl, which may also extend to the selective oxidation of other ordered intermetallic alloys.},
doi = {10.1016/j.mtla.2020.100783},
journal = {Materialia},
number = C,
volume = 12,
place = {Netherlands},
year = {2020},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.mtla.2020.100783

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