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Abstract. The detailed microstructure in front of recrystallization boundaries and their migration during annealing were traced using ex-situ electron backscatter pattern maps of one and the same surface area taken after annealing. It is observed that many protrusions/detrusions form on the recrystallizing boundaries. During annealing, the recrystallization boundary segments migrate in a stop-go type of fashion, while protrusions and detrusions alternately form and disappear. The correlation between the protrusions/detrusions and the stop-go type of migration are briefly discussed.

Abstract. The migration of a recrystallization boundary in pure aluminum was followed during in situ annealing in a scanning electron microscope. The microstructure was characterized using the electron channeling contrast technique, and a typical stop-go grain boundary motion was observed during annealing. Thermal grooving associated with boundary migration on the inspected free surface was characterized after the in-situ experiment using atomic force microscopy. The results show that new thermal grooves develop at places where the recrystallization boundary segments remain stationary for a relatively long time. The kinetics of thermal grooving are determined and effects hereof on the boundary migration as well as influence on its formation from surface oxidation layer are discussed.

The generation of initial microstructures for use in the investigation of grain growth in quasi-binary textured systems (i.e. one texture component plus an otherwise random texture) is described. For investigations of the effect of texture tightness the microstructural morphology (grain shapes/sizes) can be taken from electron back-scatter pattern orientation mapping data. The procedure consists of first aligning the data to an ideal orientation and then adjusting selectively those orientations belonging to the texture component of interest. For investigation of the effect of texture fraction and average grain size ratio, a method is described for constructing microstructures with different combinations of these parameters, by making use of a surface energy term in the Potts model Hamiltonian.All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of Trans Tech Publications Ltd, www.scientific.net.