Abstract
High purity aluminum specimens have been irradiated at 50°C with 800 MeV protons using the Los Alamos Meson Physics Facility (LAMPF). Specimens cyclically stressed during irradiation produced only a third as many voids as unstressed control specimens. This is consistent with a model of Green and Weertman which predicts that moving dislocations should be better vacancy sinks than stationary ones. The reduced swelling was observed under the severe conditions of peak swelling temperature and simultaneous He implanatation by transmutation. The detailed mode of dislocation motion responsible for the reduction is still under investigation.
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