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Perovskite Ti3AlC Carbide Splitting in High Nb Containing TiAl Alloys

Published online by Cambridge University Press:  19 December 2014

Li Wang ,
Heike Gabrisch ,
Uwe Lorenz ,
Frank-Peter Schimansky ,
Andreas Stark  and
Florian Pyczak
Li Wang
Affiliation:
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Strasse 1, Geesthacht, D-21502, Germany
Heike Gabrisch
Affiliation:
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Strasse 1, Geesthacht, D-21502, Germany
Uwe Lorenz
Affiliation:
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Strasse 1, Geesthacht, D-21502, Germany
Frank-Peter Schimansky
Affiliation:
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Strasse 1, Geesthacht, D-21502, Germany
Andreas Stark
Affiliation:
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Strasse 1, Geesthacht, D-21502, Germany
Florian Pyczak
Affiliation:
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Strasse 1, Geesthacht, D-21502, Germany
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Abstract

Transmission electron microscopy has been used to investigate the morphological development of the perovskite (P-) Ti3AlC carbides in the γ matrix of a Ti-45Al-5Nb-0.75C alloy during annealing. P-Ti3AlC carbides in the γ matrix initially have a needle-like shape but during annealing at 800 °C they change to a plate-like shape. In the needle-like shape the carbides are orientated parallel to the [001] direction of the matrix. They extend along the [100]γ or [010]γ direction into plates later and subsequently split into sub particles after extended annealing. It is proposed that the elastic interaction energy between the split sub domains may be the reason that this decomposition into sub-particles is energetically favorable.

Keywords

morphologytransmission electron microscopy (TEM)microstructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy06-11
Copyright
Copyright © Materials Research Society 2014 

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References

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