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  Breaking the continuity of the Al2O3 oxide scale by additions of Cr in Co–Al–W-based superalloys

Liang, Z., Pyczak, F., Stark, A., Rao, Z., Neumeier, S., & Göken, M. (2021). Breaking the continuity of the Al2O3 oxide scale by additions of Cr in Co–Al–W-based superalloys. Corrosion Science, 189: 109594. doi:10.1016/j.corsci.2021.109594.

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 Creators:
Liang, Zhida1, Author              
Pyczak, Florian2, Author              
Stark, Andreas1, Author              
Rao, Ziyuan3, Author              
Neumeier, Steffen4, Author              
Göken, Mathias4, Author              
Affiliations:
1Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany, ou_persistent22              
2Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Straße 1, Geesthacht, Germany, ou_persistent22              
3High-Entropy Alloys, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_3010672              
4Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Materials Science and Engineering, Institute i, Martensstr. 5, 91058 Erlangen, Germany, ou_persistent22              

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Free keywords: Alloying; Alumina; Aluminum alloys; Aluminum oxide; Chromium alloys; Cobalt alloys; Silicon alloys; Superalloys; Synchrotron radiation; Transmission electron microscopy, Breakings; Co-based superalloys; Cr addition; Diffusion rate; Oxidation behaviours; Oxidation stages; Oxide layer; Oxide scale; TEM; Transient oxidations, Oxidation
 Abstract: The paper presents the effect of small amounts of Cr alloying on the oxidation behavior of a Co-9Al-9W-2Si alloy. A small amount of Cr alloying inhibits the formation of a continuous Al2O3 scale in the oxide layers. The exact mechanism is explained by studying the transient oxidation stages. Cr addition can increase the diffusion rate of oxygen in the oxidation scale. Al is consumed very fast by forming Co(Al,Cr)2O4. This impedes the formation of Al2O3. As a result, the few formed Al2O3 particles do not merge to a continuous scale in the oxide layer. © 2021 Elsevier Ltd

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Language(s): eng - English
 Dates: 2021-08-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.corsci.2021.109594
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Title: Corrosion Science
  Abbreviation : Corros. Sci.
Source Genre: Journal
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Publ. Info: Amsterdam : Pergamon
Pages: - Volume / Issue: 189 Sequence Number: 109594 Start / End Page: - Identifier: ISSN: 0010-938X
CoNE: https://pure.mpg.de/cone/journals/resource/954925393343