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An18O tracer study on the growth mechanism of alumina scales on NiAl and NiAlY alloys

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Abstract

The effect of Y additions on the oxidation mechanism of NiAl at 1270 K has been investigated. Mass transport in the alumina scale was examined with18O tracers. Proton activation analysis (18O(p, α)15N) and SIMS were used to measure the18O distribution in the scale. On pure NiAl and low-doped (0.07% Y) NiAl mainly outward scale growth was observed. Addition of 0.5% Y induces oxide formation at both interfaces of the scale. Larger quantities of Y added to the alloy (>0.5%) do not dissolve completely in the NiAl, but form Y-rich segregates. Internal oxidation of these intergranular segregates was observed. The relation between the modification of the scale-growth mechanism and the improved adherence of the scale to the alloy due to the addition of Y is discussed.

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Authors and Affiliations

  1. Inorganic Chemistry Department, State University Utrecht, Croesestraat 77A, 3522, AD Utrecht, The Netherlands

    E. W. A. Young

  2. Laboratory for Metallurgy and Materials Science, Delft University of Technology, Rotterdamseweg 137, 2628, AL Delft, The Netherlands

    J. H. W. de Wit

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  1. E. W. A. Young
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  2. J. H. W. de Wit
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Young, E.W.A., de Wit, J.H.W. An18O tracer study on the growth mechanism of alumina scales on NiAl and NiAlY alloys. Oxid Met 26, 351–361 (1986). https://doi.org/10.1007/BF00659341

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  • DOI: https://doi.org/10.1007/BF00659341

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