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Effects of Carbon Content, Annealing Condition and Internal Defects on the nucleation, growth and coarsening of P-type Carbides in High Niobium Containing TiAl Alloys

Published online by Cambridge University Press:  30 December 2014

Li Wang ,
Florian Pyczak ,
Heike Gabrisch ,
Uwe Lorenz ,
Mathias Münch ,
Frank-Peter Schimansky ,
Andreas Schreyer  and
Andreas Stark
Li Wang
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 Brandenburgisch Technische Universität Cottbus-Senftenberg Konrad-Wachsmann-Allee 17, Cottbus, D-03046, 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
Mathias Münch
Affiliation:
Brandenburgisch Technische Universität Cottbus-Senftenberg Konrad-Wachsmann-Allee 17, Cottbus, D-03046, Germany
Frank-Peter Schimansky
Affiliation:
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Strasse 1, Geesthacht, D-21502, Germany
Andreas Schreyer
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
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Abstract

The nucleation, growth and coarsening of carbides is investigated in high niobium containing TiAl alloys by diffraction and transmission electron microscopy. Higher carbon content increases the dissolution temperature of carbides. The solubility of carbon is much higher in a γ/α2-phase alloy than in the γ phase alone. Hereby no significant influence of Nb on carbon solubility is found. Crystallographic defects as grain boundaries and dislocations promote carbide nucleation which results in a carbide precipitation sequence starting first at grain boundaries, then at dislocations and only later in the γ matrix away from crystallographic defects. The consumption of carbon by grain boundary carbides or neighboring α2 grains also generates a precipitate free zone in γ grains near the grain boundary.

Keywords

nucleation & growthtransmission electron microscopy (TEM)x-ray diffraction (XRD)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy06-12
Copyright
Copyright © Materials Research Society 2014 

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References

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