Electron microscope observations on the annealing processes occurring in cold-worked silver

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Abstract
Electron microscope observations on the dislocation structure of cold-worked polycrystalline silver and on the processes occurring during annealing are described. In silver deformed 25% in tension the dislocations are arranged in a cell structure and the stored energy is released in two stages, a recovery stage followed by recrystallization. During the recovery stage there is no observable change in the dislocation distribution but there is a possibility of small-scale dislocation rearrangements within the cell boundaries. Recrystallization occurs by the migration of the grain boundaries originally present in the metal and this process is discussed in some detail. Observations made on heavily rolled silver annealed either inside the electron microscope on a heating stage or outside the microscope are also described.