Increased mobility of an [alpha]-Al.sub.2O.sub.3 grain boundary by electron-beam irradiation

When subjected to electron-beam irradiation in a transmission electron microscope, the grain boundary in an [alpha]-Al.sub.2O.sub.3 bicrystal is observed to migrate even at room temperature. The bicrystal is composed of grains with the same normal direction, and thus the difference in strain energy...

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Bibliographic Details
Published in:Journal of materials science 2018-02, Vol.53 (4), p.2383
Main Authors: Lee, Sung Bo, Lee, Seung-Yong, Kim, Miyoung, Han, Heung Nam
Format: Article
Language:English
Subjects:
Electrons
Grain boundaries
Radiolysis
Surface energy
Transmission electron microscopes
Online Access:Get full text
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Summary:When subjected to electron-beam irradiation in a transmission electron microscope, the grain boundary in an [alpha]-Al.sub.2O.sub.3 bicrystal is observed to migrate even at room temperature. The bicrystal is composed of grains with the same normal direction, and thus the difference in strain energy or surface energy between the two grains cannot explain the observed migration. We attribute this phenomenon to an increase in grain boundary mobility by electron-beam irradiation, especially by radiolysis effects.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-017-1688-z