Abstract
A detailed study has been made of the influence of nickel on the void swelling of pure Fe-Cr-Ni ternary alloys irradiated with 1 MeV electrons. The main influence of nickel was to strongly restrain void nucleation, increase the incubation dose at low to intermediate temperatures, and to increase the “critical void size” prior to linear swelling. Isothermal and temperature change experiments revealed a relationship between the swelling rate and void density. Small nickel variations did not significantly change the swelling rate during isothermal irradiation. Large increases in the nickel level normally reduced the swelling rate but certain electron irradiation conditions were found which produced similar maximum swelling rates with large nickel variations (15 to 40%). This suggests that various commercial alloys could all eventually swell at similar rates irrespective of their composition and initial swelling response.
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