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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)
98 Downloads (Pure)

Abstract

Oxidation mechanisms in polycrystalline Co–Ni–Cr–Al–W–Ta alloys were investigated using O16/O18 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
Volume116
Early online date23 Dec 2016
DOIs
Publication statusPublished - 15 Feb 2017

Keywords

  • Oxidation
  • SIMS
  • STEM
  • Superalloys

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