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Diffusion brazing of γ-TiAl-alloys: Investigations of the joint by electron microscopy and high-energy X-ray diffraction

Published online by Cambridge University Press:  25 January 2013

Katja Hauschildt ,
Andreas Stark ,
Uwe Lorenz ,
Norbert Schell ,
Torben Fischer ,
Malte Blankenburg ,
Martin Mueller  and
Florian Pyczak
Katja Hauschildt
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany
Andreas Stark
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany
Uwe Lorenz
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany
Norbert Schell
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany
Torben Fischer
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany
Malte Blankenburg
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany
Martin Mueller
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany
Florian Pyczak
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany
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Abstract

Diffusion brazing is a potential method to repair parts made from TiAl-alloys. Two different brazing materials with varying contents of titanium, iron and nickel were investigated. The phases present in the brazed zone were identified by high energy X-ray diffraction (HEXRD) at the material science beamline HEMS at the PETRA III synchrotron facility at DESY in Hamburg, Germany, and the microstructure was characterised by scanning electron microscopy (SEM). The braze zone itself is composed of one to two transitional layers from the substrate material to the middle of the joint. Near the substrate material the phase constitution reassembles a TiAl-alloy while the middle of the joint is similar to α/β-titanium alloys. Besides phases commonly encountered in TiAl-alloys such as γ, α2 and β, additional phases, which are related to the presence of nickel or iron as melting point depressing elements are present. The microstructure of the brazed zone changes significantly during a subsequent heat treatment.

Keywords

brazingx-ray diffraction (XRD)scanning electron microscopy (SEM)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1516: Symposium JJ – Intermetallic-Based Alloys—Science, Technology and Applications , 2013 , pp. 215 - 220
Copyright
Copyright © Materials Research Society 2013 

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References

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