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Phase Transitions and Recrystallization in a Ti-46at%Al-9at%Nb Alloy as Observed by In-Situ High-Energy X-ray Diffraction

Published online by Cambridge University Press:  26 February 2011

Klaus-Dieter Liss
Affiliation:
kdl@ansto.gov.auAustralian Nuclear Science and Technology OrganisationBragg InstituteMenai NSWAustralia
Helmut Clemens
Affiliation:
helmut.clemens@unileoben.ac.at, Montanuniversität Leoben, Department of Physical Metallurgy and Materials Testing, Leoben, 8700, Austria
Arno Bartels
Affiliation:
bartels@tu-harburg.de, Technical University Hamburg-Harburg, Department of Materials Science and Technology, Hamburg, 21073, Germany
Andreas Stark
Affiliation:
stark@tu-harburg.de, Technical University Hamburg-Harburg, Department of Materials Science and Technology, Hamburg, 21073, Germany
Thomas Buslaps
Affiliation:
buslaps@esrf.fr, European Synchrodron Radiation Facility, Grenoble, 38043, France
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Abstract

High-energy synchrotron X-ray diffraction is a powerful tool for bulk studies of materials. In this investigation, it is applied to the investigation of an intermetallic γ-TiAl based alloy with a composition of Ti-46Al-9Nb. The morphology of the reflections on the Debye-Scherrer rings is evaluated in order to approach grain sizes as well as crystallographic correlations. An in-situ heating cycle from room temperature to a temperature above the α-transus temperature has been conducted starting from a massively transformed sample. With increasing temperature the occurrence of strain relaxation, chemical and phase separation, domain orientations, phase transitions, recrystallization processes, and subsequent grain growth can be observed. During cooling to room temperature, crystallographic correlations between the re-appearing γ-phase and the host α-phase, known as the Blackburn correlation, are observed in the reciprocal lattice, which splits into different twinning and domain orientation relationships present in the fully lamellar microstructure.

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

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References

REFERENCES

1. Liss, K.-D., Bartels, A., Schreyer, A., and Clemens, H., Textures and Microstructures 35, 219 (2003).CrossRefGoogle Scholar
2. Kestler, H. and Clemens, H. in Titanium and Titanium Alloys, edited by Peters, M. and Leyens, C., (WILEY-VCH, Weinheim, Germany, 2003) pp. 351392.Google Scholar
3. Model mar345 by marresearch GmbH, Norderstedt, Germany; http://www.marresearch.com/Google Scholar
4. Liss, K.-D., Bartels, A., Clemens, H., Bystrzanowski, S., Stark, A., Buslaps, T., Schimansky, F.-P., Gerling, R., Scheu, C., and Schreyer, A., Acta Materialia 54, 3721 (2006).CrossRefGoogle Scholar
5. Clemens, H., Bartels, A., Bystrzanowski, S., Chladil, H., Leitner, H., Dehm, G., Gerling, R., and Schimansky, F.-P., Intermetallics 14, 1380 (2006).CrossRefGoogle Scholar
6. Blackburn, M. J. in The Science, Technology and Application of Titanium Alloys, edited by. Jaffee, R. I. and Promisel, N. E., (Plenum Press, New York, NY, 1970) pp. 633652.CrossRefGoogle Scholar

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Phase Transitions and Recrystallization in a Ti-46at%Al-9at%Nb Alloy as Observed by In-Situ High-Energy X-ray Diffraction
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Phase Transitions and Recrystallization in a Ti-46at%Al-9at%Nb Alloy as Observed by In-Situ High-Energy X-ray Diffraction
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Phase Transitions and Recrystallization in a Ti-46at%Al-9at%Nb Alloy as Observed by In-Situ High-Energy X-ray Diffraction
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