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Excellent irradiation resistance is the basic property of nuclear materials to keep nuclear safety. The high-entropy design has great potential to improve the irradiation resistance of the nuclear materials, which has been proven in alloys. However, whether or not high entropy can also improve the irradiation resistance of ceramics, especially the mechanism therein still needs to be uncovered. In this work, the irradiation and helium (He) behaviors of zirconium carbide (ZrC)-based high-entropy ceramics (HECs), i.e., (Zr0.2Ti0.2Nb0.2Ta0.2W0.2)C, were investigated and compared with those of ZrC under 540 keV He ion irradiation with a dose of 1×1017 cm−2 at room temperature and subsequent annealing. Both ZrC and (Zr0.2Ti0.2Nb0.2Ta0.2W0.2)C maintain lattice integrity after irradiation, while the irradiation-induced lattice expansion is smaller in (Zr0.2Ti0.2Nb0.2Ta0.2W0.2)C (0.78%) with highly thermodynamic stability than that in ZrC (0.91%). After annealing at 800 ℃, ZrC exhibits the residual 0.20% lattice expansion, while (Zr0.2Ti0.2Nb0.2Ta0.2W0.2)C shows only 0.10%. Full recovery of the lattice parameter (a) is achieved for both ceramics after annealing at 1500 ℃. In addition, the high entropy in the meantime brings about the favorable structural evolution phenomena including smaller He bubbles that are evenly distributed without abnormal coarsening or aggregation, segregation, and shorter and sparser dislocation. The excellent irradiation resistance is related to the high-entropy-induced phase stability, sluggish diffusion of defects, and stress dispersion along with the production of vacancies by valence compensation. The present study indicates a high potential of high-entropy carbides in irradiation resistance applications.


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Reduced He ion irradiation damage in ZrC-based high-entropy ceramics

Show Author's information Xiao-Ting Xina,c,Weichao Baoa,( )Xin-Gang Wanga( )Xiao-Jie Guoa,cYing LudChenxi ZhuaJi-Xuan LiubQiang LiaFangfang Xua( )Guo-Jun Zhangb
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
University of Chinese Academy of Sciences, Beijing 100049, China
School of Engineering, Westlake University, Hangzhou 310024, China

† Xiao-Ting Xin and Weichao Bao contributed equally to this work.

Abstract

Excellent irradiation resistance is the basic property of nuclear materials to keep nuclear safety. The high-entropy design has great potential to improve the irradiation resistance of the nuclear materials, which has been proven in alloys. However, whether or not high entropy can also improve the irradiation resistance of ceramics, especially the mechanism therein still needs to be uncovered. In this work, the irradiation and helium (He) behaviors of zirconium carbide (ZrC)-based high-entropy ceramics (HECs), i.e., (Zr0.2Ti0.2Nb0.2Ta0.2W0.2)C, were investigated and compared with those of ZrC under 540 keV He ion irradiation with a dose of 1×1017 cm−2 at room temperature and subsequent annealing. Both ZrC and (Zr0.2Ti0.2Nb0.2Ta0.2W0.2)C maintain lattice integrity after irradiation, while the irradiation-induced lattice expansion is smaller in (Zr0.2Ti0.2Nb0.2Ta0.2W0.2)C (0.78%) with highly thermodynamic stability than that in ZrC (0.91%). After annealing at 800 ℃, ZrC exhibits the residual 0.20% lattice expansion, while (Zr0.2Ti0.2Nb0.2Ta0.2W0.2)C shows only 0.10%. Full recovery of the lattice parameter (a) is achieved for both ceramics after annealing at 1500 ℃. In addition, the high entropy in the meantime brings about the favorable structural evolution phenomena including smaller He bubbles that are evenly distributed without abnormal coarsening or aggregation, segregation, and shorter and sparser dislocation. The excellent irradiation resistance is related to the high-entropy-induced phase stability, sluggish diffusion of defects, and stress dispersion along with the production of vacancies by valence compensation. The present study indicates a high potential of high-entropy carbides in irradiation resistance applications.

Keywords: zirconium carbide (ZrC), high-entropy carbides, irradiation damage, dislocations, helium (He) bubbles

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Publication history

Received: 17 November 2022
Revised: 30 December 2022
Accepted: 30 January 2023
Published: 10 April 2023
Issue date: May 2023

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© The Author(s) 2023.

Acknowledgements

The present work is financially supported by the National Natural Science Foundation of China (52032001, 52102081, and 51532009), Shanghai Sailing Program (20YF1455500), Science and Technology Commission of Shanghai Municipality (16DZ2260603), and Shanghai Technical Platform for Testing and Characterization on Inorganic Materials (19DZ2290700). The implantation was performed at the 320 kV platform for multi-disciplinary research with highly charged ions at Institute of Modern Physics, Chinese Academy of Sciences.

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