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Effects of a pre-anneal on the mechanical properties of γ-TiAl

Published online by Cambridge University Press:  21 March 2011

Fabienne Grégori ,
Philippe Penhoud  and
Patrick Veyssière
Fabienne Grégori
Affiliation:
LEM, CNRS-ONERA, BP 72, 92322 Châtillon cedex, France.
Philippe Penhoud
Affiliation:
LEM, CNRS-ONERA, BP 72, 92322 Châtillon cedex, France.
Patrick Veyssière
Affiliation:
LEM, CNRS-ONERA, BP 72, 92322 Châtillon cedex, France.
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Abstract

The temperature, TP, and the stress, σP, at which the yield stress of γ-TiAl alloys peaks are influenced by factors such as alloy composition and load orientation. Available data indicates that in the absence of adequate heat treatments, TP and σP are shifted towards values significantly higher than those of samples pre-annealed in order to precipitate interstitial atoms. Conditions under which precipitation influences the anomalous regime are revealed by dedicated tests. In addition to pointing out the clear effect of interstitials, these tests suggest that further ordering may contribute to the strength of Al-rich γ-TiAl.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N7.4.1
Copyright
Copyright © Materials Research Society 2001

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Footnotes

1

LPMTM, Institut Galilée, 99 av. Clément, 93430 Villetaneuse, France.

References

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