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Experimental Studies and Thermodynamic Simulation of Phase Transformations in γ-TiAl Based Alloys

Published online by Cambridge University Press:  26 February 2011

Harald F. Chladil ,
Helmut Clemens ,
Harald Leitner ,
Arno Bartels ,
Rainer Gerling ,
Wilfried T. Marketz  and
Ernst Kozeschnik
Harald F. Chladil
Affiliation:
Dept. of Physical Metallurgy and Materials Testing, Montanuniversitaet, A-8700 Leoben, Austria
Helmut Clemens
Affiliation:
Dept. of Physical Metallurgy and Materials Testing, Montanuniversitaet, A-8700 Leoben, Austria
Harald Leitner
Affiliation:
Dept. of Physical Metallurgy and Materials Testing, Montanuniversitaet, A-8700 Leoben, Austria
Arno Bartels
Affiliation:
Materials Science and Technology, TU-Hamburg-Harburg, D-21071 Hamburg, Germany
Rainer Gerling
Affiliation:
Institute for Materials Research, GKSS-Research Centre, D-21502 Geesthacht, Germany
Wilfried T. Marketz
Affiliation:
Boehler-Schmiedetechnik GmbH&CoKG, A-8605 Kapfenberg, Austria
Ernst Kozeschnik
Affiliation:
Institute for Materials Science, Welding and Forming, Graz University of Technology, A-8010 Graz, Austria
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Abstract

Phase transformations and phase transition temperatures in several Nb-rich γ-TiAl based alloys were investigated experimentally and compared to thermodynamic simulations. The present study combines light-optical and scanning electron microscopy, X-ray diffraction and differential-scanning-calorimetry for the characterization of the prevailing phases and phase transformations. Thermodynamic simulation based on the CALPHAD method was used for predict phase stabilities. The results from experiments on a variety of γ-TiAl based alloys are compared to thermodynamic calculations. Finally, the influence of carbon on the transition temperatures is presented.

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References

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