Abstract
A mechanistic study of the hardening of high-purity iron has been done after fission and 14 MeV neutron irradiation. Radiation hardening is observed in the test temperature range of 77 to 300 K. Measurements of activation parameters of deformation have led to the conclusion that the hardening is athermal. While hardening is observed in the specimens irradiated beyond 2 × 10 21 n/m 2 in RTNS-II, TEM has revealed no defects unless the fluence exceeded 4.6 × 10 22 n/m 2 . It is concluded that microvoids are the possible obstacles responsible for the athermal hardening of iron. A simple theory is presented to account for the observed difference in the temperature dependence after irradiation under different conditions.
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