Dynamic high-resolution transmission electron microscopy was used to study the migration of an [00l]  = 5 tilt grain boundary. Variations in the atomic arrangement during migration were monitored in real-space, with a time-resolution of 1/60s. The non-periodic boundary, which comprised several structural units, migrated and became a periodic structure along (310) planes when the units transformed into ones which were surrounded by {130} facets. Units that were surrounded by {120} facets then grew and aligned themselves along (120) planes. It was found that migration arose from the translation and transformation of 3 of the structural units at the boundary, and that the migration speed was controlled by the time that was required for translation or structural transformation of the units.

T.Kizuka, M.Iijima, N.Tanaka: Materials Science Forum, 1997, 233-234, 405-12