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Interactions between Lattice Dislocations and Interfaces in Solids

Published online by Cambridge University Press:  22 February 2011

J. S. Liu  and
R. W. Balluffi
J. S. Liu
Affiliation:
Department of Materials Science and Engineering and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, U.S.A.
R. W. Balluffi
Affiliation:
Department of Materials Science and Engineering and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, U.S.A.
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Abstract

Attention is focused on the interactions which occur when lattice dislocations impinge on interfaces (i.e., grain boundaries, crystal/crystal interphase boundaries and crystal/amorphous boundaries) in solids. The lattice dislocations can generally dissociate into interface dislocations possessing smaller Burgers vectors under a driving force produced by a decrease in the elastic energy. For crystal/crystal interfaces, a wide range of possibilities exists, depending upon the grain boundary type, which extends from dissociation into a discrete number of interface dislocations to dissociations into a distribution consisting of, in the limit, an infinite number of interface dislocations possessing infinitesimal Bur.ers vectors. For crystal/ anorphous interfaces, the latter model is applicable. Examples of dissociations in these various interfaces are presented. The dissociation geometries and kinetics are described briefly. Some of the wider implications of these phenomena are mentioned.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 25: Symposium C – Thin Films and Interfaces II , 1983 , 261
Copyright
Copyright © Materials Research Society 1984

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