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Deformation of Al-Rich γ-TiAl by <110] Dislocations Over the Domain of Flow Stress Anomaly

Published online by Cambridge University Press:  15 February 2011

Fabienne Grégori  and
Patrick Veysslère
Fabienne Grégori
Affiliation:
LPMTM, Institut Galilée, Av. Clément, 93430 Villetaneuse, France, fg@lpmtm.univ-paris13.fr
Patrick Veysslère
Affiliation:
LEM, CNRS-ONERA, BP 72, 92322 Châtillon cedex, France, patrickv@onera.fr
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Abstract

The flow stress of Al-rich γ-TiAl peaks at a temperature located between about 600°C and 1000°C. We present mechanical data on samples oriented so as to deform on a <011]{111} system in single slip. These data are complemented by TEM observations in samples strained at selected temperatures (RT, 400°C, 600°C and 800°C). The present paper addresses (i) properties of dislocation organisation, (ii) the dissociation mode of <110] dislocations, (iii) locking properties of <110] dislocations and (iv) the formation of faulted dipoles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 578: Symposia A/C – Multiscale Phenomena in Materials - Experiments in Modeling , 1999 , 193
Copyright
Copyright © Materials Research Society 2000

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References

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