The synergetic effect of He and Kr irradiation on helium bubble evolution in SiC/SiC composite:Combining in-situ TEM observation with MD simulation

Shanshan Xu ¹Ce Zheng ¹Xiaoqiang Li ¹Ning Gao ²Zijing Huang ³Jian Zhang ³Chong Wei ⁴Cheng Zhang¹

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作者信息

1. Science and Technology on Thermo Structural Composite Materials Laboratory,Northwestern Polytechnical University,Xi'an 710072,China
2. Institute of Frontier and Interdisciplinary Science and Key Laboratory of Particle Physics and Particle Irradiation(MOE),Shandong University,Qingdao 266237,China
3. College of Energy,Xiamen University,Xiamen 361005,China
4. Science and Technology on Thermo Structural Composite Materials Laboratory,Northwestern Polytechnical University,Xi'an 710072,China;School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi'an 710072,China
折叠

Abstract

SiC fiber reinforced SiC matrix composites(SiC/SiC composites)are considered as one of the promising structural materials for liquid type breeding blanket in the fusion energy system.The transmutation gas production rate in fusion reactor is significantly higher compared with fission reactors.An innovative method combining in-situ irradiation and TEM observation and MD simulation was utilized to evaluate the synergetic effects of helium and irradiation on SiC/SiC composites.A comprehensive experiment ma-trix including Kr irradiation,He pre-implantation with sequential Kr irradiation as well as simultaneous dual beam at 1073 K to 16 dpa and 2400 appm He(150 appm/dpa)was performed using 800 keV Kr and 50 keV He ions.With the support of MD results,the impact of relative concentration ratio of vacan-cies and helium atoms on the bubble evolution was systematically investigated and the corresponding mechanism was further unraveled,which provides the basis of limiting the bubble density in SiC/SiC composites.Additionally,the direct evidence for the competition of irradiation-assisted bubble growth and re-dissolution was in-situ observed in SiC matrix for the first time.

Key words

SiC/In-situ/Irradiation/TEM/Bubble/Molecular dynamics simulation

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基金项目

National Natural Science Foundation of China(12105226)

National Key R&D Program of China(2022YFB3706000)

Innovation Capability Support Program of Shaanxi(2023-CX-TD-45)

Innovation Capability Support Program of Shaanxi(2023KJXX-009)

Nuclear Energy Development Project()

Fundamental Research Funds for the Central Universities()

Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(CX2021062)

出版年

2024

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCD

影响因子：0.657

ISSN：1005-0302

参考文献量70

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