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Alloying effects on oxidation mechanisms in polycrystalline Co–Ni base superalloys
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Ismail, F. B., Vorontsov, V. A., Lindley, T. C., Hardy, M. C., Dye, D. and Shollock, Barbara A. (2017) Alloying effects on oxidation mechanisms in polycrystalline Co–Ni base superalloys. Corrosion Science, 116 . pp. 44-52. doi:10.1016/j.corsci.2016.12.009
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Official URL: http://dx.doi.org/10.1016/j.corsci.2016.12.009
Abstract
Oxidation mechanisms in polycrystalline Co–Ni–Cr–Al–W–Ta alloys were investigated using View the MathML source isotopic tracer analysis in the focused ion-beam secondary ion mass spectrometer (FIB-SIMS). It was found that Al additions favour the formation of a continuous alumina-rich layer, that Cr indirectly improved oxidation resistance and that increasing the Co fraction resulted in poorer oxidation performance. In the alloy containing 15 at.% Cr and 10 at.% Al, the outer scale formed after 200 h oxidation at 800 °C comprised oxides less than 1 μm thick. It is concluded that protective oxide scales can be formed in Co–Ni base superalloys.
| Item Type: | Journal Article | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Subjects: | T Technology > TN Mining engineering. Metallurgy | ||||||||||
| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | ||||||||||
| Library of Congress Subject Headings (LCSH): | Heat resistant alloys -- Oxidation -- Testing | ||||||||||
| Journal or Publication Title: | Corrosion Science | ||||||||||
| Publisher: | Pergamon-Elsevier Science Ltd | ||||||||||
| ISSN: | 0010-938X | ||||||||||
| Official Date: | 15 February 2017 | ||||||||||
| Dates: |
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| Volume: | 116 | ||||||||||
| Page Range: | pp. 44-52 | ||||||||||
| DOI: | 10.1016/j.corsci.2016.12.009 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||
| Funder: | Rolls-Royce Group plc, Imperial College, London, Mara (Organization : Malaysia), Engineering and Physical Sciences Research Council (EPSRC) | ||||||||||
| Grant number: | EP/L001748/1, EP/M005607/1 (EPSRC) |
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