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

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Title: Alloying effects on oxidation mechanisms in polycrystalline Co-Ni base superalloys
Authors: Ismail, FB
Vorontsov, VA
Lindley, TC
Hardy, MC
Dye, D
Shollock, BA
Item Type: Journal Article
Abstract: Oxidation mechanisms in polycrystalline Co-Ni-Cr-Al-W-Ta alloys were investigated using 16O/18O isotopic tracer anal- ysis 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 ⁰C comprised oxides less than 1 µm thick. It is concluded that protective oxide scales can be formed in Co-Ni base superalloys.
Issue Date: 23-Dec-2016
Date of Acceptance: 20-Dec-2016
URI: http://hdl.handle.net/10044/1/43301
DOI: https://dx.doi.org/10.1016/j.corsci.2016.12.009
ISSN: 0010-938X
Publisher: Elsevier
Start Page: 44
End Page: 52
Journal / Book Title: Corrosion Science
Volume: 116
Copyright Statement: © 2016 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Rolls-Royce Plc
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/H006060/1
EP/L001748/1
EP/K027344/1
5002680312
RG75356
Keywords: Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
Superalloys
SIMS
STEM
Oxidation
HIGH-TEMPERATURE ALLOYS
NICKEL
Energy
0912 Materials Engineering
0905 Civil Engineering
0913 Mechanical Engineering
Publication Status: Published
Appears in Collections:Materials
Faculty of Natural Sciences
Faculty of Engineering