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Phase Evolution and Transformations During Long-Term Creep of Two-Phase Titanium Aluminides

Published online by Cambridge University Press:  15 February 2011

F. Appel ,
M. Oehring  and
P.J. Ennis
F. Appel
Affiliation:
Institute for Materials Research, GKSS Research Centre, Max-Planck-Straße, D-21502 Geesthacht, Germany, fritz.appel@gkss.de
M. Oehring
Affiliation:
Institute for Materials Research, GKSS Research Centre, Max-Planck-Straße, D-21502 Geesthacht, Germany, fritz.appel@gkss.de
P.J. Ennis
Affiliation:
Institute for Materials and Processes in Energy Systems, Research Centre Jülich, D-52425 Jülich, Germany
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Abstract

Titanium aluminide alloys based on the intermetallic γ (TiAl) and α2 (Ti3Al) phases are being considered as light-weight materials for high-temperature applications in advanced energy conversion systems. However, for such applications the material suffers from insufficient creep resistance at the intended service temperature of 700°C. The paper reports an electron microscope study of diffusion controlled mechanisms which apparently cause the degradation of the strength properties. The processes lead to significant structural changes involving the formation of extended ledges and recrystallization. The driving forces of these mechanisms probably arise from non-equilibrium phase compositions and significant coherency stresses occurring at the interfaces.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 580: Symposium E – Nucleation & Growth Processes in Materials , 1999 , 69
Copyright
Copyright © Materials Research Society 2000

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