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High-Resolution Electron Microscopy of Grain Boundary Migration

Published online by Cambridge University Press:  21 March 2011

K. L. Merkle ,
L. J. Thompson  and
Fritz Phillipp
K. L. Merkle
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, U.S.A.
L. J. Thompson
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, U.S.A.
Fritz Phillipp
Affiliation:
Max-Planck-Institut für Metallforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany
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Abstract

Atomic-scale grain boundary (GB) migration has been directly observed by high-resolution transmission electron microscopy (HREM). Atomic-scale motion of high-angle tilt GBs as well as twist and general GBs at gold island grains with a number of planar facets has been studied at ambient and elevated temperatures. GB migration mechanisms depend on GB structure and geometry. Strong indications for cooperative effects has been found. In this case, as has been proposed before, atoms may undergo small shifts in their lattice positions to be incorporated into the growing grain in a collective mode. At high temperature and in the absence of a strong driving force such small lattice regions are observed to fluctuate back and forth between the two grains. Faceted GBs typically move in spurts. This appears to be inherent to GB migration, whenever the motion is controlled by different structural entities. For some GB geometries the motion was found to proceed by the lateral propagation of atomic-scale steps.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 652: Symposium Y – Influences of Interface & Dislocation Behavior on Microstructure Evolution , 2000 , Y2.4
Copyright
Copyright © Materials Research Society 2001

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