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Effect of Long-Term Aging and Creep Exposure on the Microstructure of TiAl-Based Alloy for Industrial Applications

Published online by Cambridge University Press:  26 February 2011

Juraj Lapin ,
Mohamed Nazmy  and
Marc Staubli
Juraj Lapin
Affiliation:
Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Racianska 75, SK-831 02 Bratislava, Slovak Republic
Mohamed Nazmy
Affiliation:
ALSTOM Ltd., Department of Materials Technology, CH-5401 Baden, Switzerland
Marc Staubli
Affiliation:
ALSTOM Ltd., Department of Materials Technology, CH-5401 Baden, Switzerland
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Abstract

The effect of long-term aging and creep exposure on the microstructure of a cast TiAl-based alloy with nominal chemical composition Ti-46Al-2W-0.5Si (at.%) was studied. The aging experiments were performed at temperatures between 973 and 1073 K for various times ranging from 10 to 14000 h in air. Constant load tensile creep tests were performed at applied stresses ranging from 150 to 400 MPa and at temperatures between 973 and 1123 K up to 25677 h. During aging and creep testing the α2(Ti3Al)-phase in the lamellar and feathery regions transforms to the γ(TiAl)-phase and fine needle-like B2 precipitates. Microstructural instabilities lead to a softening of the alloy. The effect of this softening on long-term creep resistance is negligible at temperatures of 973 and 1023 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S7.11
Copyright
Copyright © Materials Research Society 2005

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References

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