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Grain Boundary Dislocation Structure and Motion in an Aluminum Σ=3 [011] Bicrystal

Published online by Cambridge University Press:  10 February 2011

D. L. Medlin ,
S. M. Foiles  and
C. B. Carter
D. L. Medlin
Affiliation:
Sandia National Laboratories, Livermore California 94551
S. M. Foiles
Affiliation:
Sandia National Laboratories, Livermore California 94551
C. B. Carter
Affiliation:
Department of Chemical Engineering and Materials Science, Amundson Hall, University of Minnesota, Minneapolis, MN 55455.
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Abstract

High-resolution transmission electron microscopy (HRTEM) observations are presented of a/3[111] grain-boundary dislocations in an aluminum Σ=3[011] bicrystal. These dislocations are present on both (111) (coherent twin) and (211) (incoherent twin) facets of the bicrystal boundary. The dislocations on the coherent twin facet migrate by a climb process that increases the thickness of the twinned material. These dislocations originate on a Σ=3 (211) incoherent twin boundary where they are closely spaced and dissociated in a wide core configuration. Atomistic calculations of the defect structure and interaction of multiple a/3[111] grain boundary dislocations are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 466: Symposium G – Atomic Resolution Microscopy of Surfaces and Interfaces , 1996 , 125
Copyright
Copyright © Materials Research Society 1997

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References

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