Effect on Microstructure of Tungsten Under Helium Ions Irradiation with Multiple Energy
Kang WANG1,Aihong DENG1(),Min GONG1,Xiaobo LU1,Yuanyuan ZHANG1,Xiang LIU2
1 College of Physical Science and Technology, Sichuan University, Chengdu 610064, China 2 Southwestern Institute of Physics, Chengdu 610041, China
Cite this article:
Kang WANG,Aihong DENG,Min GONG,Xiaobo LU,Yuanyuan ZHANG,Xiang LIU. Effect on Microstructure of Tungsten Under Helium Ions Irradiation with Multiple Energy. Acta Metall Sin, 2017, 53(1): 70-76.
Tungsten is considered as the most promising candidate for plasma-facing materials in future nuclear fusion reactors. The damage behaviors of tungsten under different He irradiation are one of the main issue of concerns. In this work, the evolution of helium-related defect in polycrystalline tungsten was studied by slow positron beam analysis (SPBA) and SEM as functions of annealing temperature and implantation fluence. The results show that the number of vacancy-type defect induced by the multi-energy He irradiation increases with the increment of irradiation fluence. At the meantime, annealing at the temperature of 220 ℃ induces the recombination of interstitial W atoms with vacancies, thus reduces the number of the vacancy-type defects in the sample. And annealing at 450 and 650 ℃ leads to the formation of He bubbles in the tungsten materials, and the size of He bubbles in tungsten is related to the annealing temperature, and the He bubbles and holes with a diameter of about 600 nm could be observed for the specimen annealing at 650 ℃.
Table 1 The number of tungsten samples and the corresponding fluence of He+ irradiation
(1016 cm-2)
Fig.1 SRIM-2013 calculation results of the He+ implantation profiles (full symbols) in tungsten and the corresponding displacements profiles (open symbols)
Fig.2 S-E plots for the He+ implanted tungsten under different fluences (S—low momentum annihilation fractions,E—positron energy)
Fig.3 S-W plots for virgin W (a) and the He+ implanted tungsten samples of 1# (b), 2# (c) and 3# (d) (W—high momentum annihilation fraction)
Fig.4 Cross-sectional SEM images of 3# sample of virgin tungsten (a) and He+ implanted tungsten (b~e) without annealing (b), annealed at 220 ℃ (c), 450 ℃ (d) and 650 ℃ (e) (Circles in Figs.4b and c indicate the small white bubbles)
Fig.5 S-E plots for the He+ implanted tungsten annealed at different temperatures
Fig.6 S-W plots for virgin tungsten (a) and He+ implanted tungsten annealed at 220 ℃ (b), 450 ℃ (c) and 650 ℃ (d)
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