Abstract
Different mechanisms can result in vacancy formation in the active slip bands of crystals subjected to cyclic deformation. Measurements about the size and concentrations of the possible vacancy agglomerates or voids do not exist, however. Therefore, measurements of small-angle neutron scattering were done on undeformed and cyclically deformed copper single crystals of the orientation 〈111〉 and of a thickness of 4mm. The cyclically deformed crystals showed increased scattering, which, after fatigue to about 80% of the fatigue life, can be related partly to dislocations and partly to voids about 20 Å (2 nm) in diameter. The corresponding value for the volume fraction is about 10 −5. Measurements of positron annihilation on sections of the same crystals confirm these results.
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