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Stress Driven Phase Transformations and Recrystallization Processes in Two-Phase Titanium Aluminide Alloys

Published online by Cambridge University Press:  21 March 2011

Fritz Appel  and
Michael Oehring
Fritz Appel
Affiliation:
Institute for Materials Research, GKSS Research Centre, Max-Planck-Str., D-21502 Geesthacht, GERMANY
Michael Oehring
Affiliation:
Institute for Materials Research, GKSS Research Centre, Max-Planck-Str., D-21502 Geesthacht, GERMANY
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Abstract

The paper presents an electron microscope study of phase transformation and recrystallization in an intermetallic α2(Ti3Al) + γ(TiAl) titanium aluminide alloy, after long-term creep. The mechanisms are closely related to the atomic structure of the α2/γ phase boundaries and are probably driven by a non-equilibrium of the phase composition leading to the dissolution of the α2 phase. The α2 /γ transformation is accompanied by the formation of precipitates, because the γ(TiAl)phase has a significantly lower solubility for interstitial impurities than the α2(Ti3Al) phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 652: Symposium Y – Influences of Interface & Dislocation Behavior on Microstructure Evolution , 2000 , Y11.7
Copyright
Copyright © Materials Research Society 2001

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References

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