The dynamic study of radiation-induced defects with annealing is critical for the material design for next-generation nuclear energy systems.The native vacancy could affect the development of defects,which lacks study.In the present work,the as-hot pressed ZrC1-x(x=0,0.15,0.3)ceramics which comprised crystallites of a few microns in size with different amounts of carbon vacancies were irradiated by 540 keV He2+ions at room temperature with a fluence of 1×1017/cm2.The radiation-induced lattice expan-sion was found to be a common phenomenon in a sequence of ZrC0.85≥ZrC1.0＞ZrC0.7.Both X-ray and elec-tron diffractions confirmed maintenance of structural integrity without amorphization after irradiation.Inside the irradiated region,only"black-dot"type defects,i.e.,clusters of point defects were observed while no helium-induced cavities,cracks,or extended dislocations were detected.The as-irradiated ZrC1-x were then annealed at different high temperatures.Upon annealing at 800℃,very tiny helium-induced cavities were found to be generated and the crystal lattice recovered to a great extent,especially for the sub-stoichiometric samples.While annealed at 1500℃,all the samples almost fully recovered the crystal lattices close to those of as-hot pressed ones.Meanwhile,large cavities and extended dislocations were generated.With increasing amount of native carbon vacancies,the size of cavities increased while the length and density of extended dislocations decreased.Inverse changes of lattice parameters during irra-diation and annealing processes have been interpreted by the kinetics of defects.Finally,the correlation between native vacancies and damage behavior is discussed.

Weichao Bao;Xin-Gang Wang;Ying Lu;Ji-Xuan Liu;Shikuan Sun;Guo-Jun Zhang;Fangfang Xu

State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Shanghai 200050,China;State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Institute of Functional Materials,Donghua University,Shanghai 201620,China;School of Material Science and Energy Engineering,Foshan University,Foshan 528000,China

材料科学技术（英文版）

[1]Weichao Bao;Xin-Gang Wang;Ying Lu;Ji-Xuan Liu;Shikuan Sun;Guo-Jun Zhang;Fangfang Xu-.Effect of native carbon vacancies on evolution of defects in ZrC1-x under He ion irradiation and annealing)[J].材料科学技术（英文版）,2022(24):87-97

ZrC1,He2+ions,ZrC0,diffractions

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