Alloying effects on oxidation mechanisms in polycrystalline Co-Ni base superalloys
File(s)
Author(s)
Ismail, FB
Vorontsov, VA
Lindley, TC
Hardy, MC
Dye, D
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.
Date Issued
2016-12-23
Date Acceptance
2016-12-20
Citation
Corrosion Science, 2016, 116, pp.44-52
URI
DOI
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
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
Grant Number
EP/H006060/1
EP/L001748/1
EP/K027344/1
5002680312
RG75356
Subjects
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