Solidification path, high temperature phase equilibria and the effect of solidification parameters on microstructure during directional solidification of TiAl based alloys


Development of new TiAl based alloys requires experimental data about their high temperature phase equilibria, phase transformation temperatures and solidification path to verify validity of thermodynamic calculations used for their design. Directional solidification in a Bridgman type apparatus combined with quenching and in situ measurements of temperature profiles is applied for such fundamental experimental studies. Microstructure analysis of quench during solidification samples and in-situ temperature measurements result in identification of primary solidification phase, solidification path and estimation of phase transformation temperatures.



SL interface a 
SL interface b 
SL interface c 
OM micrographs showing the effect of growth rate V on morphology of solid-liquid interface at a constant temperature gradient
Heating curveExample of heating curve measured in situ in the sample using Bridgman apparatus for directional solidification

Additional reading

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KLIMOVÁ, A. - LAPIN, J. - PELACHOVÁ, T. - NOSKO, M. Effect of solidification parameters on microsegregation behaviour of main alloying elements in a peritectic TiAl based alloy. In KOVOVE MATER, 2013, vol.51, pp. 89-99. (IF 0.546)(CurrentContents, Scopus, WOS). ISSN 0023-432X.

KLIMOVÁ, A. - GABALCOVÁ, K. - LAPIN, J. Effect of the solidification parameters on the distribution of the alloying elements during directional solidification of the intermetallic Ti-44Al-5Nb-0.2B-0.2C alloy. In 22nd International Conference on Metallurgy and Materials, METAL 2013,2013, Tanger Ltd, pp. 1328-1333. (SCOPUS, WOS). ISBN 978-80-87294-41-3.

LAPIN, J. - GABALCOVÁ, Z. - PELACHOVÁ, T. - BAJANA, O. Microstructure and Mechanical Properties of a Cast Intermetallic Ti-46Al-8Ta Alloy. In MATER SCI FORUM, 2010, vol.638-642, pp. 1368-1373. (Scopus, WOS). ISSN: 0255-5476.

HECHT, U. - DALOZ, D. - LAPIN, J. - DREVERMANN, A. - WITUSIEWICZ, V.T. - ZOLLINGER, J. Solidification of TiAl-based alloys. In Mater. Res. Soc. Symp. Proc., 2009, vol.1128, pp. 79-90. (Scopus,WOS). ISSN: 0272-9172, ISBN: 978-1-60511-1001.

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GABALCOVÁ, Z. - LAPIN, J. Estimation of high temperature phase equilibria in directionally solidified intermetallic Ti-45.9Al-8Nb alloy. In KOVOVE MATER, 2007, vol.45, pp. 231-240. (IF 1.345) (CurrentContents, WOS, SCOPUS). ISSN 0023-432X.

LAPIN, J. - GABALCOVÁ, Z.Solidification behaviour of TiAl-based alloys studied by directional solidification technique. In INTERMETALLICS, 2011, vol.19, pp. 797-804.(IF 1.649) (CurrentContents, Scopus, WOS). ISSN: 0966-9795.

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