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Oxidation Protection of Multiphase Mo-Containing γ-TiAl-Based Alloys under Cyclic Test Conditions

Published online by Cambridge University Press:  16 February 2015

A. Donchev ,
R. Pflumm ,
M. Galetz ,
S. Mayer ,
H. Clemens  and
M. Schütze
A. Donchev*
Affiliation:
DECHEMA‐Forschungsinstitut, Theodor-Heuss-Allee 25, D-60486 Frankfurt am Main, Germany
R. Pflumm
Affiliation:
DECHEMA‐Forschungsinstitut, Theodor-Heuss-Allee 25, D-60486 Frankfurt am Main, Germany
M. Galetz
Affiliation:
DECHEMA‐Forschungsinstitut, Theodor-Heuss-Allee 25, D-60486 Frankfurt am Main, Germany
S. Mayer
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Franz-Josef Str. 18, A-8700 Leoben, Austria
H. Clemens
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Franz-Josef Str. 18, A-8700 Leoben, Austria
M. Schütze
Affiliation:
DECHEMA‐Forschungsinstitut, Theodor-Heuss-Allee 25, D-60486 Frankfurt am Main, Germany
*
*donchev@dechema.de, +49697564386
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Abstract

Intermetallic titanium aluminides solidifying via the disordered β-phase are of great interest for several high-temperature applications in automotive and aircraft industries. In this paper the thermocyclic oxidation behavior of three β-solidifying γ-TiAl-based alloys at 800°C and 900°C in air, with and without fluorine treatment, is reported for the first time. The behavior of the well-known TNM alloy (Ti-43.5Al-4Nb-1Mo-0.1B, in at.%) is compared with that of two Nb-free model alloys which contain different amounts of Mo (Ti-44Al-3Mo and Ti-44Al-7Mo, in at.%). During thermocyclic high-temperature exposure in air a mixed oxide scale develops on all three untreated alloys. Small additions of fluorine in the subsurface region of the alloys change the oxidation mechanism from mixed oxide scale formation to alumina at both temperatures. The oxidation resistance of the fluorine treated samples was significantly improved compared to the untreated samples.

Keywords

oxidationscanning electron microscopy (SEM)surface reaction
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy05-10
Copyright
Copyright © Materials Research Society 2015 

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References

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