Abstract
Positron annihilation lifetime measurements have been performed for irradiated Fe, Fe-10%Cr, Fe-10%Cr-0.07%C and JFMS (Japanese Ferritic/Martensitic Stainless Steel) specimens. Information on the radiation-induced defects and defect clusters, especially the behaviour of migration and annihilation of these defects was obtained. It was concluded that vacancies migrate in the temperature range between 150°C and 200°C for these alloys, (below room temperature in pure Fe) and probably small interstitial clusters disappear at higher temperatures, i.e., 300°C to 400°C. The pure Fe specimens irradiated by 14 MeV neutrons showed higher resistance to the recovery of the second component of the positron annihilation spectrum than that in fission-neutron irradiated specimens, which means that some defect clusters, probably small interstitial clusters or vacancy-gas complexes, remain in more stable form in fusion-neutron irradiated specimens by the aid of transmutation-produced gases.
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