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Effect of hydrogen on the integrity of aluminium?oxide interface at elevated temperatures

Author(s)
Li, Meng; Xie, De-Gang; Ma, Evan; Zhang, Xi-Xiang; Shan, Zhi-Wei; Li, Ju; ... Show more Show less
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Abstract
Hydrogen can facilitate the detachment of protective oxide layer off metals and alloys. The degradation is usually exacerbated at elevated temperatures in many industrial applications; however, its origin remains poorly understood. Here by heating hydrogenated aluminium inside an environmental transmission electron microscope, we show that hydrogen exposure of just a few minutes can greatly degrade the high temperature integrity of metal–oxide interface. Moreover, there exists a critical temperature of ∼150 °C, above which the growth of cavities at the metal–oxide interface reverses to shrinkage, followed by the formation of a few giant cavities. Vacancy supersaturation, activation of a long-range diffusion pathway along the detached interface and the dissociation of hydrogen-vacancy complexes are critical factors affecting this behaviour. These results enrich the understanding of hydrogen-induced interfacial failure at elevated temperatures.
Date issued
2017-02
URI
http://hdl.handle.net/1721.1/110184
Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Journal
Nature Communications
Publisher
Nature Publishing Group
Citation
Li, Meng; Xie, De-Gang; Ma, Evan; Li, Ju; Zhang, Xi-Xiang and Shan, Zhi-Wei. “Effect of Hydrogen on the Integrity of Aluminium–oxide Interface at Elevated Temperatures.” Nature Communications 8 (February 2017): 14564 © 2017 The Author(s)
Version: Final published version
ISSN
2041-1723

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