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Abstract

A thin-film electron-microscope study has been made of a commercially pure and a zone-refined molybdenum, neutron-irradiated to a dose of 5 × 10¹⁹ n/cm² at 60 and 200° C. Visible damage clusters are present in all the specimens, but they are more coarsely distributed in the purer material and after irradiation at the higher temperature. In the case of the zone-refined material irradiated at 200° C the damage is distinguishable as two components: coarsely distributed, irregular dislocation lines and a finer distribution of small dots up to 50 Å in dia. The results of loop analysis on annealed specimens indicate that the small dots are vacancy clusters. Dark-field analysis was carried out on the small clusters, showing asymmetrical contrast in the zone-refined material irradiated at 60 and 200° C. The results indicate that these clusters, at least, are small loops.

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The Influence of Irradiation Temperature on the Damage Structure in Neutron-Irradiated Molybdenum

Abstract

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