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The structure of high-angle grain boundaries

โœ Scribed by D.G Brandon


Publisher
Elsevier Science
Year
1966
Weight
712 KB
Volume
14
Category
Article
ISSN
0001-6160

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โœฆ Synopsis


A coincidence model of high-angle grain boundaries can be extended to include deviations from coincidence. The generalised boundary has a terraced structure, corresponding to the densely packed planes in the coincidence lattice, and a superimposed dislocation network, corresponding to a sub-boundary in the coincidence lattice. This model is a natural extension of previous dislocation models and models based on coincidence relationships. The model explains many of the observed properties of grain boundaries and should have wide validity for the cubic system. STRUCTURE DE JOINTS DE GRAINS A GRANDS ANGLES Un mod& de oomcidence pour les joints de grains B grand angle peut etre modifie de maniere B incline les &arts de co'incidence. Le joint generalise presente une structure en terrace, correspondant aux plans denses dans le reseau de coincidence et un reseau supplementaire de dislocations correspondant iL un sous-joint dans le reseau de comcidence. Ce modele est une extension naturelle des modeles de dislocations snterieurs et de modeles Btsblis sur la base des relations de coincidence. 11 explique un grand nombre des proprietes observees des joints de greins et il semblerait valable dans de nombreux cas pour le systeme cubique. DIE STRUKTUR VON GROBWINKELKORNGRENZEN Ein Koinzidenzmodell von GroDwinkelkorngrenzen kann so erweitert werden, da6 es such Abweichungen von der Koinzidenz einschliefit. Die allgemeine Korngrenze hat eine Stufenstruktur, entsprechend den dichtest gepackten Ebenen im Koinzidenzgitter, und ein iiberlagertes Versetzungsnetzwerk, entsprechend einer Subkorngrenze im Koinzidenzgitter. Dieses Model1 ist eine natiirliche Erweiterung friiherer Versetzungsmodelle und von Modellen, die auf Koinzidenzbeziehungen beruhen. Des Model1 erkliirt viele der beobachteten Korngrenzeneigenschaften und sollte in kubischen Systemen in vielen Fiillen zutreffend sein.


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