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

Engineering

University of Warwick

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

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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 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

Keywords

Oxidation
SIMS
STEM
Superalloys

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10.1016/j.corsci.2016.12.009

Alloying effects on oxidation_ISMAIL_Accepted20December2016Publishedonline23December2016_GREEN AAM (CC BY-NC-ND)Accepted author manuscript, 14.9 MBLicence: CC BY-NC-ND

https://spiral.imperial.ac.uk/handle/10044/1/43301

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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 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.",

keywords = "Oxidation, SIMS, STEM, Superalloys",

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

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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 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.

AB - 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.

KW - Oxidation

KW - SIMS

KW - STEM

KW - Superalloys

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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

Keywords

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