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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

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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, Engineering and Medicine > Engineering > 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:
DateEvent
15 February 2017Published
23 December 2016Available
20 December 2016Accepted
17 November 2016Submitted
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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