Abstract
The self-diffusion coefficient of silver undergoing plastic compressive deformation was measured over temperatures ranging from 810 to 1172°K and at strain rates from 0.00075 to 0.006 hr −1. At all temperatures it was found that the diffusion coefficient is proportional to the strain rate. The results were interpreted on the basis of a model in which two vacancy-production mechanisms and two vacancy-annealing mechanisms are assumed to be operative. At low temperatures, vacancy production is assumed to occur by a geometric, temperature-independent process, and the annealing mechanism is assumed to be the migration of vacancies to fixed sinks. At high temperatures, it is suggested that vacancies are formed by a thermally activated process and that they anneal by combining with a highly mobile defect. Energetic considerations lead to the conclusion that this mobile defect is probably a divacancy.
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