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Formation and Healing of Voids at the Metal–Oxide Interface in NiAl Alloys

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Abstract

The present investigation concerns the formation and healing of voids at the metal–oxide interface in β-NiAl alloys. It is shown that transient cavities form at the metal–oxide interface during the initial stage of isothermal oxidation at 1,050 °C. These voids disappear after a few hours of oxidation, due to their filling with oxide. It is proposed that the filling of the transient voids occurs through cracks in the outer oxide scale. This allows for an oxygen transport into the cavities where a new oxide is created and grows outwards from the metal surface. Pt-containing β-NiAl alloys that have better resistance to oxide spallation show suppressed formation of cavities and/or a faster filling of voids. This is explained by the enhanced diffusion of Al in these materials.

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Acknowledgment

This work was supported by the Swedish Foundation for Strategic Research (S.S.F.), within the CROX program. Dr. Johan Angenete at Material analysis at Chalmers (MACH) and Prof. Lars-Gunnar Johansson are greatly acknowledged for fruitful discussions. The Knut and Alice Wallenberg Foundation is acknowledged for financing of the electron microscopes.

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  1. Department of Applied Physics, Chalmers University of Technology, Gothenburg, 412 96, Sweden

    H. Svensson, P. Knutsson & K. Stiller

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  1. H. Svensson
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  2. P. Knutsson
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  3. K. Stiller
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Correspondence to K. Stiller.

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Svensson, H., Knutsson, P. & Stiller, K. Formation and Healing of Voids at the Metal–Oxide Interface in NiAl Alloys. Oxid Met 71, 143–156 (2009). https://doi.org/10.1007/s11085-008-9132-z

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  • DOI: https://doi.org/10.1007/s11085-008-9132-z

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