Alloying effects on oxidation mechanisms in polycrystalline Co–Ni base superalloys

F.B. Ismail, V.A. Vorontsov, T.C. Lindley, M.C. Hardy, D. Dye, B.A. Shollock

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Oxidation mechanisms in polycrystalline Co–Ni–Cr–Al–W–Ta alloys were investigated using 16O/18O 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.

Original languageEnglish
Pages (from-to)44-52
Number of pages9
JournalCorrosion Science
Early online date23 Dec 2016
Publication statusPublished - 15 Feb 2017


  • oxidation
  • SIMS
  • STEM
  • superalloys


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