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Experimental Studies and Thermodynamic Simulations of Phase Transformations in Ti-(41-45)Al-4Nb-1Mo-0.1B Alloys

Published online by Cambridge University Press:  28 August 2018

Helmut Clemens ,
Barbara Boeck ,
Wilfried Wallgram ,
Thomas Schmoelzer ,
Laura M. Droessler ,
Gerald A. Zickler ,
Harald Leitner  and
Andreas Otto
Helmut Clemens
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, A-8700, Leoben, Austria
Barbara Boeck
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, A-8700, Leoben, Austria
Wilfried Wallgram
Affiliation:
Bohler Schmiedetechnik GmbH&CoKG, A-8605, Kapfenberg, Austria
Thomas Schmoelzer
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, A-8700, Leoben, Austria
Laura M. Droessler
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, A-8700, Leoben, Austria
Gerald A. Zickler
Affiliation:
Christian Doppler Laboratory for Early Stages of Precipitation, A-8700, Leoben, Austria
Harald Leitner
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, A-8700, Leoben, Austria Christian Doppler Laboratory for Early Stages of Precipitation, A-8700, Leoben, Austria
Andreas Otto
Affiliation:
GfE Metalle und Materialien GmbH, D-90431, Nürnberg, Germany
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Abstract

TNM™ alloys are novel γ-TiAl based alloys which exhibit a high concentration of β-stabilizing elements such as Nb and Mo. Due to the high volume fraction of disordered β-phase these alloys can be hot-die forged under near conventional conditions. In this study, solid-state phase transformations and phase transition temperatures in Ti-(41-45)Al-4Nb-1Mo-0.1B (in at%) alloys were analyzed experimentally and compared to thermodynamic calculations. Results from scanning electron microscopy, conventional and high-energy 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 were conducted. ThermoCalc® was applied using a commercially available TiAl database. Combining all results a stable as well as a metastable phase diagram for Ti-(41-45)Al-4Nb-1Mo-0.1B alloys is proposed.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1128: Symposium U – Advanced Intermetallic-Based Alloys for Extreme Environment and Energy Applications , 2008 , 1128-U03-06
Copyright
Copyright © Materials Research Society 2009

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