Early stage irradiation effects in F82H model alloys

Neutron irradiation-induced vacancy defects in F82H model alloys were studied using positron lifetime measurements. A comparison between the results from neutron irradiation and our previous electron irradiation in F82H model alloys was conducted. The results showed that Cr has a consistent effect on void swelling resistance. The void swelling suppression by Cr was explained using the configuration trapping model. However, for the W, V and Ta solute effects, the results of two types of irradiation support the solute and dislocation interaction model. The effects on metal carbides (M23C6) were investigated using neutron irradiation at 363 K and electron irradiation. For neutron irradiation, the solute effect may be the dominating factor compared to the effects of the M23C6. Solute depletion caused by metal carbides can explain the difference.