Abstract
Irradiation of high purity (99.9 wt %) nickel at 525 °C with 6 to 11 MeV selenium ions produced voids in the metal. In general, the size and number density of the voids increased with displacement damage up to approximately 50 displacements per atom (dpa). Irradiation to higher displacement densities caused a slight reduction in the average size and a continued increase in the number density of voids. The resultant swelling was found to increase as the 1.45 power of the displaced atom density until approximately 50 dpa. The volume change appears to saturate at approximately 4–5% in the 100–400 dpa range. A face centered cubic superlattice of voids was discovered in nickel which had been irradiated to 400 dpa.
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