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Helium bubble formation and evolution in NiMo-Y2O3 alloy under He ion irradiation

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【作者】 刘阿文黄鹤飞刘继召朱振博李燕

【Author】 Awen Liu;Hefei Huang;Jizhao Liu;Zhenbo Zhu;Yan Li;School of Physical Science and Technology,Shanghai Tech University;Shanghai Institute of Applied Physics,Chinese Academy of Sciences;School of Nuclear Science and Technology,University of Chinese Academy of Sciences;

【通讯作者】 黄鹤飞;李燕;

【机构】 School of Physical Science and Technology,Shanghai Tech UniversityShanghai Institute of Applied Physics,Chinese Academy of SciencesSchool of Nuclear Science and Technology,University of Chinese Academy of Sciences

【摘要】 We report helium ion irradiation experiments for a new type of dispersion-strengthened NiMo-Y2 O3 alloy with three different irradiation doses and varying irradiation dose rates at 750℃ to evaluate its helium-induced damage behavior.Transmission electron microscopy was used to reveal the evolution of helium bubbles after irradiation.The experimental results show that with increasing ion dose,the number density of helium bubbles increases continuously.However,the mean size of helium bubbles first increases and then decreases,mainly due to the varied ion dose rates.The volume fractions of helium bubbles in the three investigated samples after irradiation are 0.15%,0.32%,and 0.27%,which are lower than that of the Hastelloy N alloy(0.58%) after similar irradiation conditions.This indicates that the NiMo-Y2 O3 alloy exhibits better helium-induced-swelling resistance than the Hastelloy N alloy,highlighting its potential applicability to MSRs,from the perspective of irradiation performance.

【Abstract】 We report helium ion irradiation experiments for a new type of dispersion-strengthened NiMo-Y2 O3 alloy with three different irradiation doses and varying irradiation dose rates at 750℃ to evaluate its helium-induced damage behavior.Transmission electron microscopy was used to reveal the evolution of helium bubbles after irradiation.The experimental results show that with increasing ion dose,the number density of helium bubbles increases continuously.However,the mean size of helium bubbles first increases and then decreases,mainly due to the varied ion dose rates.The volume fractions of helium bubbles in the three investigated samples after irradiation are 0.15%,0.32%,and 0.27%,which are lower than that of the Hastelloy N alloy(0.58%) after similar irradiation conditions.This indicates that the NiMo-Y2 O3 alloy exhibits better helium-induced-swelling resistance than the Hastelloy N alloy,highlighting its potential applicability to MSRs,from the perspective of irradiation performance.

【基金】 supported by the National Natural Science Foundation of China (Grant Nos.12022515,11975304,and 91126012);the Youth Innovation Promotion Association, CAS (Grant No.202063)
  • 【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2022年04期
  • 【分类号】TL426;TG146.15
  • 【下载频次】9
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