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Phase Equilibria and Phase Transformations in Molybdenum-Containing TiAl Alloys

Published online by Cambridge University Press:  18 January 2011

Svea Mayer,
Christian Sailer,
Hirotoyo Nakashima,
Thomas Schmoelzer,
Thomas Lippmann,
Peter Staron,
Klaus-Dieter Liss,
Helmut Clemens and
Masao Takeyama
Svea Mayer
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Leoben, Austria
Christian Sailer
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Leoben, Austria
Hirotoyo Nakashima
Affiliation:
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, Tokyo, Japan
Thomas Schmoelzer
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Leoben, Austria
Thomas Lippmann
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht Outstation at DESY, Hamburg, Germany
Peter Staron
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
Klaus-Dieter Liss
Affiliation:
The Bragg Institute, Australian Nuclear Science and Technology Organisation, Lucas Heights, Australia
Helmut Clemens
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Leoben, Austria
Masao Takeyama
Affiliation:
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, Tokyo, Japan
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Abstract

Molybdenum, being a strong β stabilizer, is an important alloying element in TiAl alloys, since a significant volume fraction of the disordered bcc β-phase at elevated temperatures improves the processing characteristics during hot-working. Unfortunately, the effect of Mo on the individual phases and their transition temperatures is not completely known but is necessary for designing engineering applications. In this paper, sections of the Ti-Al-Mo ternary phase diagram derived from thermodynamic calculations as well as experimental data are presented. Further, the phase transition temperatures given by the phase diagrams are compared with results from isothermal heat treatment studies, differential scanning calorimetry measurements and in-situ high-temperature diffraction experiments. Combining all of these results, a revised phase diagram is proposed.

Keywords

phase transformationx-ray diffraction (XRD)scanning electron microscopy (SEM)

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References

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