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Solidification of TiAl-based alloys

Published online by Cambridge University Press:  28 August 2018

Ulrike Hecht ,
D. Daloz ,
J. Lapin ,
A. Drevermann ,
V.T. Witusiewicz  and
J. Zollinger
Ulrike Hecht
Affiliation:
Access e.V., Intzestr. 5, 52072 Aachen, Germany (email: [email protected])
D. Daloz
Affiliation:
LSG2M, Ecole des Mines de Nancy, 54042 Nancy Cedex, France
J. Lapin
Affiliation:
Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Racianska 75, 831 02 Bratislava 3, Slovak Republic
A. Drevermann
Affiliation:
Access e.V., Intzestr. 5, 52072 Aachen, Germany (email: [email protected])
V.T. Witusiewicz
Affiliation:
Access e.V., Intzestr. 5, 52072 Aachen, Germany (email: [email protected])
J. Zollinger
Affiliation:
Access e.V., Intzestr. 5, 52072 Aachen, Germany (email: [email protected])
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Abstract

Titanium aluminides containing high niobium additions emerged as an attractive alloy family for automotive and aero-engine applications. Their processing by near net shape casting is rather demanding, not only due to easy contamination but also due to the fact that microstructure formation during solidification and subsequent solid state transformations sensitively depends on alloy composition and the applied processing conditions. The sequence of phase formation during solidification of the ternary alloy Ti-45Al-8Nb was analyzed based on non-equilibrium thermodynamic calculations and solidification experiments. This alloy solidifies completely via the β(Ti) phase, because the nucleation undercooling for the α(Ti) phase is high enough to prevent its formation. Thermodynamic calculations and experiments are shown to converge at last, with only minor improvements being necessary to correctly describe the metastable eutectic reaction “Liquid → β(Ti) + γ-TiAl” that occurs at the end of the solidification path.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1128: Symposium U – Advanced Intermetallic-Based Alloys for Extreme Environment and Energy Applications , 2008 , 1128-U03-01
Copyright
Copyright © Materials Research Society 2009

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