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High Temperature Oxidation Protection of Multi-Phase Mo-Containing TiAl-Alloys by the Fluorine Effect

Published online by Cambridge University Press:  29 November 2012

Alexander Donchev ,
Raluca Pflumm ,
Svea Mayer ,
Helmut Clemens  and
Michael Schütze
Alexander Donchev
Affiliation:
DECHEMA-Forschungsinstitut, D-60486 Frankfurt am Main, Germany
Raluca Pflumm
Affiliation:
DECHEMA-Forschungsinstitut, D-60486 Frankfurt am Main, Germany
Svea Mayer
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, A-8700 Leoben, Austria
Helmut Clemens
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, A-8700 Leoben, Austria
Michael Schütze
Affiliation:
DECHEMA-Forschungsinstitut, D-60486 Frankfurt am Main, Germany
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Abstract

Intermetallic titanium aluminides are potential materials for application in high temperature components. In particular, alloys solidifying via the β-phase are of great interest because they possess a significant volume fraction of the disordered body-centered cubic β-phase at elevated temperatures ensuring good processing characteristics during hot-working. Nevertheless, their practical use at temperatures as high as 800°C requires improvements of the oxidation resistance. This paper reports on the fluorine effect on a multi-phase TiAl-alloy in the cast and hot-isostatically pressed condition at 800°C in air. The behavior of the so-called TNM material (Ti-43.5Al-4Nb-1Mo-0.1B, in at %) was compared with that of two other TiAl-alloys which are Nb-free and contain different amounts of Mo (3 and 7 at%, respectively). The oxidation resistance of the fluorine treated samples was significantly improved compared to the untreated samples. After fluorine treatment all alloys exhibit slow alumina kinetics indicating a positive fluorine effect. Results of isothermal and thermocyclic oxidation tests at 800°C in air are presented and discussed in the view of composition and microstructure of the TiAl-alloys investigated, along with the impact of the fluorine effect on the oxidation resistance of these materials.

Keywords

oxidationscanning electron microscopy (SEM)thermogravimetric analysis (TGA)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1516: Symposium JJ – Intermetallic-Based Alloys—Science, Technology and Applications , 2013 , pp. 95 - 100
Copyright
Copyright © Materials Research Society 2012 

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