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Abstract

Tungsten is the candidate for divertor target material in future fusion reactors. The tungsten divertor target is expected to long serve in a harsh environment of high temperature and high-energy neutron irradiation. This can lead to neutron irradiation-induced recrystallization of tungsten, thereby increasing the possibility of intergranular brittle failure and compromising the safe operation of the divertor. Thus, clarifying the mechanism of neutron irradiation-induced tungsten recrystallization is important. However, the current model, which only considers the irradiation-enhanced effect on recrystallization driving force, underestimates the irradiation effect on recrystallization compared with the results observed in recent high-temperature neutron irradiation experiments in the HFIR reactor. It indicates that other irradiation effects can also influence the recrystallization process. In this study, we introduce the irradiation-enhanced grain boundary migration factor ( R) into the established irradiation-induced recrystallization kinetic model, on the assumption that the grain boundary migration velocity is proportional to the self-diffusion coefficient. The simulation results show that after considering both irradiation-enhanced recrystallization driving force and grain boundary migration effect, the calculated half-recrystallization time ( ${t}_{{X}\text{}=\text{}0.5}$ ) at 850 ℃ from the model matches the one obtained in the neutron irradiation experiment in the HFIR reactor. This result indicates that the irradiation-enhanced grain boundary migration effect is one of the important factors affecting irradiation-induced recrystallization. In addition, the difference between irradiated and unirradiated t _X=0.5decreases with temperature increasing. This phenomenon is due to the fact that as the temperature increases, the contribution of irradiation defects to the driving force for recrystallization decreases owing to the irradiation defect recombination. Moreover, the increase of thermal activation diffusion coefficient is more significant than the increase of the irradiation-enhanced diffusion coefficient. These findings suggest that the thermal activation effect eventually dominates the recrystallization process over the irradiation effect as temperature increases.

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Authors and contacts

Corresponding author:Yin Chao,chaoyin@ustc.edu.cn; Ye Min-You,yemy@ustc.edu.cn

Funds:Project supported by the Joint Funds of the National Natural Science Foundation of China (Grant No. U2267208), the China Postdoctoral Science Foundation (Grant No. 2021M703113), the Chinese Academy of Sciences Taiwan Young Talent Program, China (Grant No. 2021TWGB0001), the University Synergy Innovation Program of Anhui Province, China (Grant No. GXXT-2021-026), the Collaborative Innovation Program of Hefei Science Center, Chinese Academy of Sciences, China (Grant No. 2022HSC-CIP010), and the Fundamental Research Funds for the Central Universities of China (Grant No. WK2140000015).

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参数	NRT_dpa /(10^–7dpa·s^–1)	S_dpa /(10^–8dpa·s^–1)	G_tot /(10²¹m^–3·s^–1)
数值	2.16	6.41	4.06

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Vol. 72, Issue 16 - 2023-08-20

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