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Oxidation Behavior of Intermetallic Titanium Aluminide Alloys

Published online by Cambridge University Press:  21 December 2012

Michael Schütze  and
Simone Friedle
Michael Schütze
Affiliation:
Dechema-Forschungsinstitut, Theodor-Heuss-Allee 25, 60486 Frankfurt am Main, Germany
Simone Friedle
Affiliation:
Dechema-Forschungsinstitut, Theodor-Heuss-Allee 25, 60486 Frankfurt am Main, Germany
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Abstract

Above 750-800°C oxidation becomes a serious life time issue for the new group of intermetallic light-weight high temperature alloys based on titanium aluminides (TiAl). Fast growing titanium oxide competes with protective alumina as a surface scale in the oxidation reaction by which the formation of a slow-growing protective oxide scale is prevented. The key to the development of alloys with sufficient oxidation resistance is the understanding of the thermodynamic and kinetic situation during the oxidation process. The latter is influenced by the type of alloying elements, the Al- and Ti-activities in the alloy, the oxidation temperature and the environment (e.g. dry or humid air, etc.). This paper provides a comprehensive summary of the oxidation mechanisms and the parameters influencing oxide scale formation. Besides the role of metallic alloying elements, the halogen effect will also be discussed. The paper finishes with recent results concerning the prevention of oxidation-induced room temperature embrittlement of TiAl alloys.

Keywords

oxidationalloysurface reaction
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1516: Symposium JJ – Intermetallic-Based Alloys—Science, Technology and Applications , 2013 , pp. 77 - 88
Copyright
Copyright © Materials Research Society 2012 

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