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The Accommodation of Lattice Mismatch on the (111) Interphase Boundary Plane in FCC Metals

Published online by Cambridge University Press:  26 February 2011

P. Gumbsch  and
H.F. Fischmeister
P. Gumbsch
Affiliation:
Max-Planck-Institut für Metallforschung, Institut fur Werkstoffwissenschaft, 7000 Stuttgart, FRG
H.F. Fischmeister
Affiliation:
Max-Planck-Institut für Metallforschung, Institut fur Werkstoffwissenschaft, 7000 Stuttgart, FRG
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Abstract

Using the embedded atom method we atomistically model the accommodation of the lattice nismatch and study the propertiesof the misfit dislocations in parallel oriented bicrystals. We calculate and analyze in detail the excess interfacial energies on the (100) and (111) boundary planes. The Ag/Ni system is chosen as a model system for metal/metal interfaces with a large lattice mismatch.

Among the possible boundary planes in parallel oriented fcc bicrystals, the ones with terminating {111} planes arc energetically most favourable and are most often observed in experiments. This can be explained by a detailed analysis of the elastic strain fields in the interfaces, which correspond to networks of misfit dislocations. While the misfit dislocations on the (100) and (011) planes have a ½[01ī] Burgers vector, those on (111) can dissociate into misfit partials. The elastic strains connected with the misfit partials are, of course, much smaller than those for other types of misfit dislocations. The misfit partials form a triangular network within the boundary plane.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 209: Symposium K – Defects in Materials , 1990 , 59
Copyright
Copyright © Materials Research Society 1991

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References

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