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

doi:10.1016/j.corsci.2016.12.009

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

Design, Manufacturing And Engineering Management

Research output: Contribution to journal › Article › peer-review

56 Citations (Scopus)

129 Downloads (Pure)

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.

Original language	English
Pages (from-to)	44-52
Number of pages	9
Journal	Corrosion Science
Volume	116
Early online date	23 Dec 2016
DOIs	https://doi.org/10.1016/j.corsci.2016.12.009
Publication status	Published - 15 Feb 2017

Funding

The authors would like to acknowledge the financial support provided by Rolls-Royce plc, Imperial College, EPSRC (grants EP/L001748/1, EP/M005607/1) and Majlis Amanah Rakyat (Government of Malaysia). We would also like to thank Dr. Richard J. Chater and Dr. Martin Weiser for their assistance.

Keywords

oxidation
SIMS
STEM
superalloys

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10.1016/j.corsci.2016.12.009

Ismail-etal-CS2016-Alloying-effects-on-oxidation-mechanisms-in-polycrystallineAccepted author manuscript, 14.9 MBLicence: CC BY-NC-ND 4.0

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Cite this

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title = "Alloying effects on oxidation mechanisms in polycrystalline Co–Ni base superalloys",

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.",

keywords = "oxidation, SIMS, STEM, superalloys",

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

year = "2017",

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doi = "10.1016/j.corsci.2016.12.009",

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T1 - Alloying effects on oxidation mechanisms in polycrystalline Co–Ni base superalloys

AU - Ismail, F.B.

AU - Vorontsov, V.A.

AU - Lindley, T.C.

AU - Hardy, M.C.

AU - Dye, D.

AU - Shollock, B.A.

PY - 2017/2/15

Y1 - 2017/2/15

N2 - 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.

AB - 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.

KW - oxidation

KW - SIMS

KW - STEM

KW - superalloys

UR - https://www.scopus.com/pages/publications/85008474260

U2 - 10.1016/j.corsci.2016.12.009

DO - 10.1016/j.corsci.2016.12.009

M3 - Article

AN - SCOPUS:85008474260

SN - 0010-938X

VL - 116

SP - 44

EP - 52

JO - Corrosion Science

JF - Corrosion Science

ER -

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

Abstract

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Keywords

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