Abstract
The effect of pre-irradiation heat treatment and of a brief postirradiation anneal at a temperature in the beta range on the swelling of irradiated uranium during annealing at 620° C is described. The experimental data show that irradiated specimens deformed and recrystallized before irradiation decrease in density on annealing at 620° C substantially more than irradiated specimens quenched from a beta temperature before irradiation for burnups greater than 0.04 %. The data also show that extensive swelling of irradiated uranium on annealing at 620° C can be minimized by a prior brief anneal of the irradiated uranium in the beta phase. The interpretation of these results is supported with photomicrographs of the swelled specimens.
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