Abstract

The initial fatigue deformation in copper has been shown to be characterised by the presence of deformation bands of high dislocation density, frequently found in conjunction with linear arrays of a dark spot defect. Also noted at this stage was the presence of heavily jogged dislocations. The final fatigue structure consisted of patches of very high dislocation density, occasionally aligned in a specific direction, resolvable as either round or elongated dislocation loops.

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