Abstract
Positron lifetime and X-ray particle size measurements were made during cyclic fatigue of each of cold-rolled and variously annealed Cu. Fatigue cycling of initially hard Cu caused the average positron lifetime and X-ray particle size to change in opposite senses, the former decreasing and the latter increasing, indicating decreasing defect density and an increase in the average subgrain size. Fatigue cycling of Cu initially in the annealed condition caused the mean positron lifetime to increase and the X-ray particle size to de-crease, indicating an increase in the defect density and a decrease in the average sub-grain size. Vacancy generation and condensation are verified as early fatigue mecha-nisms during fatigue in the absence of significant change of the dislocation cell structure.
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