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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 ,
Helmut Clemens ,
Arno Bartels ,
Andreas Stark  and
Thomas Buslaps
Klaus-Dieter Liss
Affiliation:
[email protected] Nuclear Science and Technology OrganisationBragg InstituteMenai NSWAustralia
Helmut Clemens
Affiliation:
[email protected], Montanuniversität Leoben, Department of Physical Metallurgy and Materials Testing, Leoben, 8700, Austria
Arno Bartels
Affiliation:
[email protected], Technical University Hamburg-Harburg, Department of Materials Science and Technology, Hamburg, 21073, Germany
Andreas Stark
Affiliation:
[email protected], Technical University Hamburg-Harburg, Department of Materials Science and Technology, Hamburg, 21073, Germany
Thomas Buslaps
Affiliation:
[email protected], 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.

Keywords

x-ray diffraction (XRD)microstructurephase transformation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II05-07
Copyright
Copyright © Materials Research Society 2007

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References

REFERENCES

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