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Chin. Phys. B, 2021, Vol. 30(8): 086102    DOI: 10.1088/1674-1056/ac0783
Special Issue: SPECIAL TOPIC — Ion beam modification of materials and applications
SPECIAL TOPIC—Ion beam modification of materials and applications Prev   Next  

Evolution of helium bubbles in nickel-based alloy by post-implantation annealing

Rui Zhu(朱睿)1,2, Qin Zhou(周钦)1,†, Li Shi(史力)1, Li-Bin Sun(孙立斌)1, Xin-Xin Wu(吴莘馨)1, Sha-Sha Lv(吕沙沙)3,‡, and Zheng-Cao Li(李正操)2
1 Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
2 Key Laboratory of Advanced Materials(Ministry of Education), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
3 Key Laboratory of Beam Technology, Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
Abstract  Nickel-based alloys have been considered as candidate structural materials used in generation IV nuclear reactors serving at high temperatures. In the present study, alloy 617 was irradiated with 180-keV helium ions to a fluence of 3.6×1017 ions/cm2 at room temperature. Throughout the cross-section transmission electron microscopy (TEM) image, numerous over-pressurized helium bubbles in spherical shape are observed with the actual concentration profile a little deeper than the SRIM predicted result. Post-implantation annealing was conducted at 700 ℃ for 2 h to investigate the bubble evolution. The long-range migration of helium bubbles occurred during the annealing process, which makes the bubbles of the peak region transform into a faceted shape as well. Then the coarsening mechanism of helium bubbles at different depths is discussed and related to the migration and coalescence (MC) mechanism. With the diffusion of nickel atoms slowed down by the alloy elements, the migration and coalescence of bubbles are suppressed in alloy 617, leading to a better helium irradiation resistance.
Keywords:  helium bubble      coarsening mechanism      nickel-based alloy  
Received:  13 January 2021      Revised:  31 March 2021      Accepted manuscript online:  03 June 2021
PACS:  61.72.U- (Doping and impurity implantation)  
  61.80.Jh (Ion radiation effects)  
  61.82.-d (Radiation effects on specific materials)  
Fund: Project supported by the Special Funds for the Key Research and Development Program of the Ministry of Science and Technology of China (Grant Nos. 2017YFB0702201 and 2020YFB1901800) and the National Natural Science Foundation of China (Grant Nos. 11975135 and 12005017).
Corresponding Authors:  Qin Zhou, Sha-Sha Lv     E-mail:;

Cite this article: 

Rui Zhu(朱睿), Qin Zhou(周钦), Li Shi(史力), Li-Bin Sun(孙立斌), Xin-Xin Wu(吴莘馨), Sha-Sha Lv(吕沙沙), and Zheng-Cao Li(李正操) Evolution of helium bubbles in nickel-based alloy by post-implantation annealing 2021 Chin. Phys. B 30 086102

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