The initial process of microstructure evolution in Fe16Cr17Ni and its P- and Ti-modified variants was studied during irradiation in JMTR to 1.1×1024 n/m2 (> 1.0 MeV) under improved and conventional temperature control conditions. Interstitial loop density showed strong temperature dependence; the nominal activation energy for the loop nucleation process in the ternary alloy was about 0.5 eV. With addition of 0.024%P, the interstitial loop density increased very much, but void formation was suppressed considerably. In 0.1%P-alloy, Fe2P was precipitated at 673 K instead of interstitial loops. In conventional temperature control irradiation, loop density was two to three times higher than that of improved control irradiation. This suggests the need for improvement of temperature control of fission reactor irradiation for understanding essential processes of damage evolution at the set temperature.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Materials Science(all)
- Nuclear Energy and Engineering