Abstract
Effects of neutron irradiation on microstructure, mechanical properties and swelling of several magnesium and aluminum alloys were studied. The neutron fluences of 2−3 × 10 22 n/cm 2 , > 0.2 MeV produced displacement doses of 20 to 45 displacements per atom (dpa). Ductility of the magnesium alloys was severely reduced by irradiation induced recrystallization and precipitation of various forms. Precipitation of transmuted silicon occurred in the aluminum alloys. However, the effect on ductility was much less than for the magnesium alloys. The magnesium and aluminum alloys had excellent resistance to swelling: The best magnesium alloy was Mg/3.0 wt% Al/0.19 wt% Ca; its density decreased by only 0.13%. The best aluminum alloy was 6063, with a density decrease of 0.22%.
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