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Computer Simulation Study of the Effects of Copper Precipitates on Dislocation Core Structure in Ferritic Steels

Published online by Cambridge University Press:  15 February 2011

T. Harry  and
D. J. Bacon
T. Harry
Affiliation:
Department of Materials Science and Engineering, The University of Liverpool, Liverpool L69 3BX, U.K.
D. J. Bacon
Affiliation:
Department of Materials Science and Engineering, The University of Liverpool, Liverpool L69 3BX, U.K.
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Abstract

The small, coherent BCC precipitates of copper that form during fast neutron irradiation of ferritic steels are an important component of in-service irradiation hardening. Many-body interatomic potentials for the Fe-Cu alloy system have been developed and used to simulate the atomic structure of the ½<111> screw dislocation in both pure a-iron and the metastable BCC phase of copper. In iron, the core has the well-known 3-fold form of atomic disregistry. In BCC copper, however, the core structure depends on the lattice parameter. At the metastable equilibrium value, the core is similar to that in iron, but as the lattice parameter is reduced, as in a precipitate, the core becomes delocalised by transformation of the copper. Simulation of dislocated crystals containing precipitates shows that the extent of this effect depends on precipitate size. The energy changes indicate a significant dislocation pinning effect due to this dislocation-induced precipitate transformation process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 439: Symposium B – Microstructure Evolution During Irradiation , 1996 , 495
Copyright
Copyright © Materials Research Society 1997

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References

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