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Licensed Unlicensed Requires Authentication Published by De Gruyter May 23, 2013

Experimental studies and thermodynamic simulation of phase transformations in high Nb containing γ-TiAl based alloys

  • Harald F. Chladil , Helmut Clemens , Gerald A. Zickler , Masao Takeyama , Ernst Kozeschnik , Arno Bartels , Thomas Buslaps , Rainer Gerling , Sascha Kremmer , LaReine Yeoh and Klaus-Dieter Liss


Solid-state phase transformations and phase transition temperatures in Ti-45 at.% Al and Ti-45 at.% Al-(5, 7.5, 10) at.% Nb alloys were analyzed experimentally and compared to thermodynamic calculations. Results from scanning electron microscopy, high-energy and conventional X-ray diffraction as well as differential scanning calorimetry were used for the characterization of the prevailing phases and phase transformations. For the prediction of phase stabilities and phase transition temperatures, thermodynamic calculations using the CALPHAD method were conducted. In order to achieve better agreement between calculated and experimental results, a commercially available database was modified using our own results from thermo-physical measurements and annealing treatments.

* Correspondence address, Prof. Dr. Helmut Clemens, Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz Josef-Straße 18, A-8700 Leoben, Austria, Tel.: +43 3842 402 4200, Fax: +43 3842 402 4202, E-mail:


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Received: 2007-3-20
Accepted: 2007-7-2
Published Online: 2013-05-23
Published in Print: 2007-11-01

© 2007, Carl Hanser Verlag, München

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