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Chin. Phys. B, 2021, Vol. 30(8): 086109    DOI: 10.1088/1674-1056/abff48
Special Issue: SPECIAL TOPIC — Ion beam modification of materials and applications
SPECIAL TOPIC—Ion beam modification of materials and applications Prev   Next  

In-situ TEM observation of the evolution of helium bubbles in Mo during He+ irradiation and post-irradiation annealing

Yi-Peng Li(李奕鹏)1,2, Guang Ran(冉广)1,2,†, Xin-Yi Liu(刘歆翌)1,2, Xi Qiu(邱玺)3, Qing Han(韩晴)1,2, Wen-Jie Li(李文杰)3, and Yi-Jia Guo(郭熠佳)1,2
1 College of Energy, Xiamen University, Xiamen 361102, China;
2 Fujian Research Center for Nuclear Engineering, Xiamen 361102, China;
3 Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610213, China
Abstract  The evolution of helium bubbles in purity Mo was investigated by in-situ transmission electron microscopy (TEM) during 30 keV He+ irradiation (at 673 K and 1173 K) and post-irradiation annealing (after 30 keV He+ irradiation with the fluence of 5.74×1016 He+/cm2 at 673 K). Both He+ irradiation and subsequently annealing induced the initiation, aggregation, and growth of helium bubbles. Temperature had a significant effect on the initiation and evolution of helium bubbles. The higher the irradiation temperature was, the larger the bubble size at the same irradiation fluence would be. At 1173 K irradiation, helium bubbles nucleated and grew preferentially at grain boundaries and showed super large size, which would induce the formation of microcracks. At the same time, the geometry of helium bubbles changed from sphericity to polyhedron. The polyhedral bubbles preferred to grow in the shape bounded by {100} planes. After statistical analysis of the characteristic parameters of helium bubbles, the functions between the average size, number density of helium bubbles, swelling rate and irradiation damage were obtained. Meanwhile, an empirical formula for calculating the size of helium bubbles during the annealing was also provided.
Keywords:  helium bubbles      in-situ TEM observation      ion irradiation      annealing      molybdenum  
Received:  15 April 2021      Revised:  06 May 2021      Accepted manuscript online:  10 May 2021
PACS:  61.80.-x (Physical radiation effects, radiation damage)  
  61.80.Jh (Ion radiation effects)  
  68.37.Lp (Transmission electron microscopy (TEM))  
  61.82.Bg (Metals and alloys)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. U1967211, U1832112, and 11975191).
Corresponding Authors:  Guang Ran     E-mail:  gran@xmu.edu.cn

Cite this article: 

Yi-Peng Li(李奕鹏), Guang Ran(冉广), Xin-Yi Liu(刘歆翌), Xi Qiu(邱玺), Qing Han(韩晴), Wen-Jie Li(李文杰), and Yi-Jia Guo(郭熠佳) In-situ TEM observation of the evolution of helium bubbles in Mo during He+ irradiation and post-irradiation annealing 2021 Chin. Phys. B 30 086109

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