Abstract
Abstract Dislocation densities and arrangements in foils sectioned parallel to the primary slip plane were found to be the same, within experimental error, for both neutron-irradiated and unirradiated fatigue-hardened copper crystals. The loss of dislocations from unirradiated foils sectioned perpendicular to the primary slip direction was substantial (approximately 70%) for crystals in the early stages of fatigue hardening. The evidence from these experiments supports the conclusion that primary screw dislocations were mutually annihilated by cross-slip during cyclic hardening.
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