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Micromechanisms of deformation in γ-TiAl

Published online by Cambridge University Press:  11 February 2011

Patrick Veyssière ,
Yu-Lung Chiu  and
Fabienne Grégori
Patrick Veyssière
Affiliation:
LEM, CNRS-ONERA, BP 72, 92322 Châtillon cedex, France.
Yu-Lung Chiu
Affiliation:
LEM, CNRS-ONERA, BP 72, 92322 Châtillon cedex, France.
Fabienne Grégori
Affiliation:
LPMTM, Institut Galilée, 99 Av. J. B. Clément, 93430 Villetaneuse, France.
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Abstract

Investigations conducted in our group on plastic properties of a variety of strained TiAl based alloys and resulting microstructures are reviewed. These include oriented single crystals of Al-rich γ-TiAl and semi-oriented polycrystals with γ + α2 lamellar structure. The wealth of micro-mechanisms encountered in this family of alloys is, to large extent, due to the decomposition of <011] dislocations: <011] ↔ 1/2<112] + 1/2<110]. This transformation sometimes introduces serious uncertainties as to which slip systems were actually operating during deformation. Another transformation involving decomposition is the formation of intralamellar networks during deformation. Mechanisms not involving decomposition include the trailing of faulted dipoles by <011] dislocations and the generation of arrays of prismatic loops of ordinary dislocations. The latter maneuver is at the origin of fundamental processes such as self-organisation in single slip in a variety of crystals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB4.1
Copyright
Copyright © Materials Research Society 2003

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