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Title: The role of metal vacancies during high-temperature oxidation of alloys

Abstract

An improved understanding of high-temperature alloy oxidation is key to the design of structural materials for next-generation energy conversion technologies. An often overlooked, yet fundamental aspect of this oxidation process concerns the fate of the metal vacancies created when metal atoms are ionized and enter the growing oxide layer. In this work, we provide direct experimental evidence showing that these metal vacancies can be inseparably linked to the oxidation process beginning at the very early stages. The coalescence of metal vacancies at the oxide/alloy interface results initially in the formation of low-density metal and eventually in nm-sized voids. The simultaneous and subsequent oxidation of these regions fills the vacated space and promotes adhesion between the growing oxide and the alloy substrate. These structural transformations represent an important deviation from conventional metal oxidation theory, and this improved understanding will aid in the development of new structural alloys with enhanced oxidation resistance.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [2]
  1. National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, South Park, PA (United States)
  2. National Energy Technology Lab. (NETL), Albany, OR (United States)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Albany, OR (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1569764
Report Number(s):
NETL-PUB-21387
Journal ID: ISSN 2397-2106
Grant/Contract Number:  
FE0004000
Resource Type:
Accepted Manuscript
Journal Name:
npj Materials Degradation
Additional Journal Information:
Journal Volume: 2; Journal Issue: 1; Journal ID: ISSN 2397-2106
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Metal oxidation; Ni alloy; Metal vacancy; Vacancy injection; Void formation

Citation Formats

Oleksak, Richard P., Kapoor, Monica, Perea, Daniel. E., Holcomb, Gordon R., and Doğan, Ömer N. The role of metal vacancies during high-temperature oxidation of alloys. United States: N. p., 2018. Web. doi:10.1038/s41529-018-0046-1.
Oleksak, Richard P., Kapoor, Monica, Perea, Daniel. E., Holcomb, Gordon R., & Doğan, Ömer N. The role of metal vacancies during high-temperature oxidation of alloys. United States. doi:10.1038/s41529-018-0046-1.
Oleksak, Richard P., Kapoor, Monica, Perea, Daniel. E., Holcomb, Gordon R., and Doğan, Ömer N. Wed . "The role of metal vacancies during high-temperature oxidation of alloys". United States. doi:10.1038/s41529-018-0046-1. https://www.osti.gov/servlets/purl/1569764.
@article{osti_1569764,
title = {The role of metal vacancies during high-temperature oxidation of alloys},
author = {Oleksak, Richard P. and Kapoor, Monica and Perea, Daniel. E. and Holcomb, Gordon R. and Doğan, Ömer N.},
abstractNote = {An improved understanding of high-temperature alloy oxidation is key to the design of structural materials for next-generation energy conversion technologies. An often overlooked, yet fundamental aspect of this oxidation process concerns the fate of the metal vacancies created when metal atoms are ionized and enter the growing oxide layer. In this work, we provide direct experimental evidence showing that these metal vacancies can be inseparably linked to the oxidation process beginning at the very early stages. The coalescence of metal vacancies at the oxide/alloy interface results initially in the formation of low-density metal and eventually in nm-sized voids. The simultaneous and subsequent oxidation of these regions fills the vacated space and promotes adhesion between the growing oxide and the alloy substrate. These structural transformations represent an important deviation from conventional metal oxidation theory, and this improved understanding will aid in the development of new structural alloys with enhanced oxidation resistance.},
doi = {10.1038/s41529-018-0046-1},
journal = {npj Materials Degradation},
number = 1,
volume = 2,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Fig. 1 Fig. 1: STEM cross-sectional image of a region characteristic of most of the oxidized surface.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.