Direct observation of grain boundary migration during recrystallization within the bulk of a moderately deformed aluminium single crystal
Résumé
A single grain growing in the bulk of a mildly deformed (30% thickness reduction through cold rolling) aluminium single crystal with an f001gh100i orientation (Cube orientation), is monitored during recrystallization with synchrotron radiation using topo-tomography. The formation and migration of planar boundary segments (facets) are analyzed using a method that determines the displacements of local boundary segments along parallel lines perpendicular to the facet plane. Facets are observed to form after a certain annealing time. They migrate at a constant rate for extended periods of time and remain planar during their migration. A change in the migration rate for one facet has been observed which is not related to changes in the experimental conditions and is most likely to be driven by the changes in grain orientation and/or the local deformation microstructure. The crystallography of the analyzed facets is not closely related to any crystallographic 111 plane of neither the growing grain nor the disappearing deformed matrix. © 2013 The Japan Institute of Metals and Materials.
Mots clés
Aluminium single crystals
Direct observations
Experimental conditions
Grain boundary migrations
In-situ characterization
Local deformations
Thickness reduction
Topo-tomography
Aluminum
Cold rolling
Crystallization
Grain boundaries
Recrystallization (metallurgy)
Synchrotron radiation
Tomography
Single crystals