Oxidation behaviour of gamma titanium aluminides with or without protective coatings

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DOIResolve DOI: http://doi.org/10.1179/1743280414Y.0000000034
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TypeArticle
Journal titleInternational Materials Reviews
ISSN1743-2804
Volume59
Issue6
Pages297325; # of pages: 29
AbstractThe γ-TiAl alloys are promising high temperature materials for aeroengines due to their low density, high specific strength and low material cost compared with Nickel based superalloys. However, the insufficient ductility at room temperature and the limited oxidation resistance at temperatures above approximately 750°C have limited their applications. Oxidation resistance in the application temperature range of 800 and 1000°C is of particular importance. Remarkable improvement to the environmental resistance by adding ternary and quaternary elements to the γ-TiAl alloys has been reported; however, alloying additions frequently deteriorate their mechanical properties. Surface modifications or coatings, which promote the formation of highly protective alumina scales, are also viable ways to improve the environmental resistance of TiAl alloys. In this article, the research work from the last 30 years on the oxidation behaviour of bare and coated TiAl alloys will be reviewed, with special focus on the γ-TiAl alloys. The review will begin with the oxidation behaviour of TiAl substrate alloys and the oxidation behaviour of γ-TiAl alloys with high temperature coatings such as aluminide, MCrAlY, Ti-Al-X and thermal barrier coating (TBC) system will be followed. © 2014 Institute of Materials, Minerals and Mining and ASM International Published by Maney for the Institute and ASM International.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21272188
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Record identifieraab1c02d-b009-4bc2-a01d-786ea112a226
Record created2014-07-23
Record modified2016-05-09
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