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On the Stress Anomaly of γ-TiAl

Published online by Cambridge University Press:  21 March 2011

Marc C. Fivel ,
Francois Louchet ,
Bernard Viguier  and
Marc Verdier
Marc C. Fivel
Affiliation:
GPM2 / CNRS / INPG, B.P. 46, 38402 - St Martin d'Hères, FRANCE
Francois Louchet
Affiliation:
LTPCM / INPG / UJF, B.P. 75, 38402 - St Martin d'Hères, FRANCE
Bernard Viguier
Affiliation:
LIMAT, ENSCT, INP de Toulouse, 118 rte de Narbonne, 31077 Toulouse cedex 4, FRANCE
Marc Verdier
Affiliation:
LTPCM / INPG / UJF, B.P. 75, 38402 - St Martin d'Hères, FRANCE
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Abstract

A 3D mesoscopic simulation of dislocation behaviour is adapted to the case of γ-TiAl. It shows that, in the temperature range of the stress anomaly, ordinary dislocation motion essentially proceeds through a series of pinning and unzipping processes on screw dislocations. Pinning points are cross-slip generated jogs, whose density increases with temperature. Unzipping of cusps restores the screw character of the dislocation. The balance between pinning and unzipping becomes increasingly difficult as temperature raises, and results in dislocation exhaustion. All these features agree with the so-called “Local Pinning Unzipping” mechanism.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N7.10.1
Copyright
Copyright © Materials Research Society 2001

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References

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