Simulation of neutron irradiation-induced recrystallization in tungsten
نویسندگان
چکیده
Tungsten is the candidate divertor target material in future fusion reactors. The tungsten expected to serve a severe environment of high temperature and high-energy neutron irradiation. This can lead irradiation-induced recrystallization tungsten, thereby increasing possibility intergranular brittle failure compromising safe operation divertor. Thus, clarifying mechanism crucial. However, current model, which only considers irradiation-enhanced effect on driving force, underestimates irradiation when compared with results observed recent high-temperature experiments HFIR reactor. It indicates that other effects are influencing process. study introduced grain boundary migration factor (<i>R</i>) into established kinetic model based assumption velocity proportional self-diffusion coefficient. simulation showed after considering both force effect, calculated half-recrystallization time (<i>t<sub>X</sub></i>=0.5) at 850℃ from matched one estimated experiment result important factors affecting recrystallization. In addition, difference between irradiated unirradiated <i>t<sub>X</sub></i><sub>=0.5</sub> decreases temperature. phenomenon due fact as increases, contribution defects for defect recombination. Moreover, thermal activation diffusion coefficient increase more significant than These findings suggest eventually dominates process over increases.
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ژورنال
عنوان ژورنال: Chinese Physics
سال: 2023
ISSN: ['1000-3290']
DOI: https://doi.org/10.7498/aps.72.20230531