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In Situ High-Energy XRD Study of the Hot-Deformation Behavior of a Novel γ-TiAl Alloy

Published online by Cambridge University Press:  07 December 2012

Andreas Stark
Affiliation:
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Straße 1, D-21502 Geesthacht, Germany
Emanuel Schwaighofer
Affiliation:
Montanuniversität Leoben, Department of Physical Metallurgy and Materials Testing, Franz-Josef-Straße 18, A-8700 Leoben, Austria
Svea Mayer
Affiliation:
Montanuniversität Leoben, Department of Physical Metallurgy and Materials Testing, Franz-Josef-Straße 18, A-8700 Leoben, Austria
Helmut Clemens
Affiliation:
Montanuniversität Leoben, Department of Physical Metallurgy and Materials Testing, Franz-Josef-Straße 18, A-8700 Leoben, Austria
Thomas Lippmann
Affiliation:
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Straße 1, D-21502 Geesthacht, Germany
Lars Lottermoser
Affiliation:
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Straße 1, D-21502 Geesthacht, Germany
Andreas Schreyer
Affiliation:
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Straße 1, D-21502 Geesthacht, Germany
Florian Pyczak
Affiliation:
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Straße 1, D-21502 Geesthacht, Germany
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Abstract

The development of suitable hot-forming processes, e.g. forging, is an important step towards the serial production of TiAl parts. Several microstructure parameters change during hot-forming. However, the underlying mechanisms can normally only be inferred from post process metallographic studies.

We used a deformation dilatometer modified for working in the HZG synchrotron beamlines at DESY for hot-deformation experiments. This setup enables the in situ monitoring of the interaction and evolution of microstructure parameters during processing. We observed the evolution of phase fractions, grain size and crystallographic texture during deformation while simultaneously recording the process parameters, like temperature, force and length change.

Here we present the hot compressive deformation behaviour of a Ti-43Al-4Nb-1Mo-0.1B (in at.%) alloy. Several specimens were deformed at three temperatures each with two compression rates. During the experiments the Debye-Scherrer diffraction rings were continuously recorded.

Type
Articles
Copyright
Copyright © Materials Research Society 2012 

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References

Appel, F., Paul, J.D.H. and Oehring, M., Gamma Titanium Aluminide Alloys - Science and Technology (Wiley-VCH, Weinheim, Germany, 2011).CrossRefGoogle Scholar
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Stark, A., Schimansky, F.-P. and Clemens, H., Solid State Phenomena 160, 301306 (2010).10.4028/www.scientific.net/SSP.160.301CrossRef

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In Situ High-Energy XRD Study of the Hot-Deformation Behavior of a Novel γ-TiAl Alloy
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