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Order-Disorder Transition Under Shearing : Application to Ball Milling

Published online by Cambridge University Press:  15 February 2011

P. Pochet ,
P. Bellon ,
L. Chaffron  and
G. Martin
P. Pochet
Affiliation:
CEA, Section de Recherches de Métallurgie Physique CE-Saclay F 91191 Gif sur Yvette Cedex, pochet@srmp12.saclay.cea.fr
P. Bellon
Affiliation:
CEA, Section de Recherches de Métallurgie Physique CE-Saclay F 91191 Gif sur Yvette Cedex, pochet@srmp12.saclay.cea.fr
L. Chaffron
Affiliation:
CEA, Section de Recherches de Métallurgie Physique CE-Saclay F 91191 Gif sur Yvette Cedex, pochet@srmp12.saclay.cea.fr
G. Martin
Affiliation:
CEA, Section de Recherches de Métallurgie Physique CE-Saclay F 91191 Gif sur Yvette Cedex, pochet@srmp12.saclay.cea.fr
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Abstract

The evolution under sustained shear of an ordered crystal with B2 structure is studied by Monte-Carlo simulation: the effect of shearing is modelled by shifts of atomic planes, while thermally activated atomic diffusion is promoted by the motion of one vacancy. The tricritical point expected in the dynamical phase diagram from mean field theories and from Monte-Carlo simulations in the limit of weak driving (few atoms shifted at once) does not appear in such simulations, much in the same way as for "large cascade size" in alloys under irradiation. However an unexpected bifurcation in microstructures is observed which could be related to the order-disorder transition experimentally observed under ball-milling.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 400: Symposium E – Metastable Metal-Based Phases and Microstructures , 1995 , 13
Copyright
Copyright © Materials Research Society 1996

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References

references

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