Abstract
Direct observations have been made of recrystallization in copper and a copper-phosphorus alloy by annealing specimens of the cold worked materials inside the high voltage electron microscope (HVEM). Nucleation of recrystallised grains was observed to occur by growth from suitable long subgrains by bulging out of their boundaries. In addition, it was observed that growing recrystallised grains could sometimes ‘catalyse’ nucleation of other grains when they impinged upon certain subgrains. These and other observations are discussed in the light of current theories of nucleation.
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