Data are presented to show the effects of cold-working and sub-sequent neutron irradiation on the tensile properties and hardness of arc-melted Bureau of Mines zirconium.nIncreases in hardness and yield strength resulting from the irra¬diation were more pronounced in the annealed material and were progressively less at increasing levels of cold work. More uniform increases in ultimate strength and decreases in ductility were found. The radiation damage observed in the mechanical properties was essentially saturated at the exposure levels investigated. Slight annealing of radiation induced increases in yield strength occurred in 100 hours at 250 C (480 F) and approximately 70 per cent of the radiation damage was removed in 160 hours at 350 C (660 F). Recovery of the radiation damage in annealed, irradiated material was greater than recovery of strain hardening in 50 per cent cold-worked, unirradiated material for the same annealing conditions.
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