首页|The synergetic effect of He and Kr irradiation on helium bubble evolution in SiC/SiC composite:Combining in-situ TEM observation with MD simulation
The synergetic effect of He and Kr irradiation on helium bubble evolution in SiC/SiC composite:Combining in-situ TEM observation with MD simulation
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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.
Science and Technology on Thermo Structural Composite Materials Laboratory,Northwestern Polytechnical University,Xi'an 710072,China
Institute of Frontier and Interdisciplinary Science and Key Laboratory of Particle Physics and Particle Irradiation(MOE),Shandong University,Qingdao 266237,China
College of Energy,Xiamen University,Xiamen 361005,China
School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi'an 710072,China
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National Natural Science Foundation of ChinaNational Key R&D Program of ChinaInnovation Capability Support Program of ShaanxiInnovation Capability Support Program of ShaanxiNuclear Energy Development ProjectFundamental Research Funds for the Central UniversitiesInnovation Foundation for Doctor Dissertation of Northwestern Polytechnical University
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