Abstract
The mechanism of nucleation of recrystallization is described for material having either a hot worked substructure or a cold work structure. Experiments have been conducted using low and high voltage transmission electron microscopy including in situ observations in the high voltage microscope. Salt bath experiments have been conducted to confirm the results. It is shown that recrystallization of hot worked structures involves subgrain coalescence followed by boundary migration. In the alloy investigated the dissolution of the β phase was important in creating a dislocation free region. The recrystallization of cold worked structures involves the creation of subgrains about the same size as in the parent hot rolled material, dislocation activity to form a medium angle boundary, and the migration of this boundary to form a high angle boundary and the recrystallization nucleus.
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