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Phase Transformations During Solidification of a Laser-Beam-Welded TiAl Alloy—An In Situ Synchrotron Study

  • Symposium: Neutron and X-Ray Studies of Advanced Materials VIII
  • Published:
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Abstract

An in situ highly time-resolved, high-energy X-ray diffraction investigation was carried out to observe the phase transformations of a TiAl alloy during laser beam welding. The diffraction patterns are recorded every 0.1 seconds by a fast area two-dimensional detector and plotted according to time, yielding the solidification pathway, the solid phase volume fraction, and the lattice parameter variation of different phases during the solidification and cooling process. Moreover, it is the first study that can demonstrate that the α phase without any Burgers orientation relationship, the so-called non-Burgers α, precipitates appear earlier than the Burgers α. The non-Burgers α grains are found to nucleate on the primary borides.

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Acknowledgments

The authors thank John Hedde, René Kirchhof, Gerhard Kozik, René Dinse, Jürgen Buhrz, Andreas Beldowski, Jörg Burmester, and Dennis Heims for the kind support in the design and construction of the experimental setup. Moreover, the authors are very grateful to Professor Florian Pyczak, Dr. Michael Oehring, and Dr. Jonathan Paul for the discussion about the results. Finally, the authors appreciate the specimen preparation work of Falk Dorn.

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Author notes

  1. Jie Liu

    Present address: Robert Bosch GmbH, Am Börstig 2, 96052, Bamberg, Germany

  2. Andreas Schreyer

    Present address: European Spallation Source ERIC, P.O. Box 176, 221 00, Lund, Sweden

Authors and Affiliations

  1. Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Building 45, Max-Planck-Straße 1, 21502, Geesthacht, Germany

    Jie Liu, Stefan Riekehr (Scientist of Department Joining and Assessment), Martin Müller (Director of Institute of Materials Research, Materials Physics) & Nikolai Kashaev (Head of Department Joining and Assessment)

  2. Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Building 33, Max-Planck-Straße 1, 21502, Geesthacht, Germany

    Peter Staron (Head of Department X-ray Diffraction with Synchrotron Radiation), Andreas Stark (Scientist of Department Metal Physics), Norbert Schell (Scientist of Department X-ray Diffraction with Synchrotron Radiation), Norbert Huber (Head of the division “Materials Mechanics”, Spokesman of the Helmholtz-Programme “Advanced Engineering Materials”) & Andreas Schreyer

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  1. Jie Liu
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  2. Peter Staron
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Correspondence to Jie Liu or Nikolai Kashaev.

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Manuscript submitted January 30, 2015.

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Liu, J., Staron, P., Riekehr, S. et al. Phase Transformations During Solidification of a Laser-Beam-Welded TiAl Alloy—An In Situ Synchrotron Study. Metall Mater Trans A 47, 5761–5770 (2016). https://doi.org/10.1007/s11661-016-3726-x

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  • DOI: https://doi.org/10.1007/s11661-016-3726-x

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