High-temperature radiation damage studies of Reduced Activation Ferritic/Martensitic (RAFM) steel at fusion relevant He/dpa ratio using positron beam based Doppler broadening spectroscopy
Source abstract
Abstract
Abstract High-temperature irradiation damage studies of Indian Reduced Activation Ferritic/Martensitic (INRAFM) steel have been carried out at doses relevant to fusion reactor first-wall irradiation conditions. The samples were irradiated up to 70 dpa with 1.1 MeV Fe ions at various temperatures viz., room temperature (RT), 473 K, 673 K and 773 K, with and without pre-injected helium. Depth-wise distribution of irradiation-induced defects and their thermal stability has been studied using positron beam based Doppler broadening spectroscopy. Samples without pre-injected helium show an overall reduction in S-parameter with respect to the irradiation temperature and no growth of voids has occurred, and complete defect recovery is observed at 673 K. In samples that were pre-injected with helium, a decrease in S-parameter due to annealing of vacancies and the formation of HemVn clusters is observed from RT to 673 K, and an increase in S-parameter associated with the growth of helium bubbles is observed at 773 K. Thus, helium is found to be necessary and crucial in stabilization and growth of the bubble cavities.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fusion materials and technologies · Nuclear Materials and Properties · Nuclear materials and radiation effects
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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