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

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

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.

LanguageEnglish
Pages44-52
Number of pages9
JournalCorrosion Science
Volume116
Early online date23 Dec 2016
DOIs
Publication statusPublished - 15 Feb 2017

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Superalloys
Alloying
Oxidation
Oxides
Aluminum Oxide
Focused ion beams
Oxidation resistance
Mass spectrometers
Alumina
Ions

Keywords

  • oxidation
  • SIMS
  • STEM
  • superalloys

Cite this

Ismail, F.B. ; Vorontsov, V.A. ; Lindley, T.C. ; Hardy, M.C. ; Dye, D. ; Shollock, B.A. / Alloying effects on oxidation mechanisms in polycrystalline Co–Ni base superalloys. In: Corrosion Science. 2017 ; Vol. 116. pp. 44-52.
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Alloying effects on oxidation mechanisms in polycrystalline Co–Ni base superalloys. / Ismail, F.B.; Vorontsov, V.A.; Lindley, T.C.; Hardy, M.C.; Dye, D.; Shollock, B.A.

In: Corrosion Science, Vol. 116, 15.02.2017, p. 44-52.

Research output: Contribution to journalArticle

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AU - Ismail, F.B.

AU - Vorontsov, V.A.

AU - Lindley, T.C.

AU - Hardy, M.C.

AU - Dye, D.

AU - Shollock, B.A.

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