Inhibiting the formation of planar defects in grown alumina scale on Ni-Al alloys

Twin boundaries and stacking faults (TBs&SFs) in thermally grown oxide scales can deteriorate the oxidation resistance of engineering alloys and it is challenging to inhibit them. Herein, we find that introducing a coherent NiO layer can significantly reduce the TBs&SFs density in γ-Al2O3 sc...

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Bibliographic Details
Published in:Corrosion science 2023-08, Vol.220, p.111263, Article 111263
Main Authors: Xin, Y.C., Xu, W., Liang, T.S., Wang, W., Zhang, B.
Format: Article
Language:English
Subjects:
Coherent NiO
Nanograined Ni-Al alloy
Oxidation
Twin boundary
γ-Al2O3
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Summary:Twin boundaries and stacking faults (TBs&SFs) in thermally grown oxide scales can deteriorate the oxidation resistance of engineering alloys and it is challenging to inhibit them. Herein, we find that introducing a coherent NiO layer can significantly reduce the TBs&SFs density in γ-Al2O3 scales on Ni-Al alloys and thereby enhance the oxidation resistance. Importantly, such a NiO layer can be spontaneously formed on the surface of a nanograined Ni-7 wt%Al alloy, and its oxidation resistance is three times that of the β-NiAl intermetallics. This provides a novel strategy to develop advanced oxidation resistant materials for high temperature application. [Display omitted] •TBs&SFs can deteriorate oxidation resistance of thermally grown oxide scales.•A NiO top layer can inhibit the formation of TBs&SFs in γ-Al2O3 scale.•NG Ni-7Al alloy was developed with a spontaneously formed NiO layer.•Oxidation rate of NG sample is one third that of β-NiAl.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2023.111263