The changes in density and hardness as a result of annealing at temperatures up to 600°C are reported for an aluminum-clad Al-5 w/o Pu and Al-10 w/o Pu alloy inwhich 89-3% and 75.6%, respectively, of the plutonium atoms were fissioned. The density of the irradiated specimens at room temperature decreased after pulse anneals of 15-min dura¬tion at temperatures above 525°C, whereas for lower anneal¬ing temperatures the density of the specimens increased. The hardness of the specimens at room temperature de¬creased substantially after annealing at temperatures be-tween 275°C and 360°C.nA specimen of 1100 aluminum which was heavily de¬formed by rolling was also annealed in a manner similar to the irradiated materials. The density of the aluminum at room temperature increased after pulse anneals at temper-atures up to 600°C, and the hardness decreased after an¬nealing at temperatures above 300°C.
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