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Unidirectional Solidification and Single Crystal Growth of Al-rich Ti-Al Alloys

Published online by Cambridge University Press:  01 February 2011

Anne Drevermann
Affiliation:, ACCESS e.V., Germany
Georg J. Schmitz
Affiliation:, ACCESS e.V., Germany
Günther Behr
Affiliation:, Leibniz-Institut für Festkörper- und Werkstoffforschung, Dresden, Germany
Elke Schaberger-Zimmermann
Affiliation:, Foundry Institute, Aachen, Germany
Christo Guguschev
Affiliation:, Leibniz-Institut für Festkörper- und Werkstoffforschung, Dresden, Germany
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To investigate the basic mechanical and thermomechanical properties of TiAl alloys with high Aluminium content sufficiently large single crystalline domains are required. To fabricate these samples undirectional solidification in Bridgman Stockbarger furnaces and optical floating zone devices were used. Focus of investigation were grain selection and impurity contamination. Both processes allow for growth of single crystal domains of some millimetres diameter and a few centimetres length. However in a Bridgman Stockbarger furnace the long contact times with the crucible proved detrimental to oxidation issues whereas in the optical floating zone device oxidation is negligible due to containerless processing.

Research Article
Copyright © Materials Research Society 2009

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