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Structural integrity and damage of ZrB2 ceramics after 4 MeV Au ions irradiation

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journal contribution
posted on 06.10.2020, 10:48 by Weichao Bao, Stuart RobertsonStuart Robertson, Jiawei Zhao, Ji-Xuan Liu, Houzheng Wu, Guo-Jun Zhang, Fangfang Xu
Ultra-high temperature ceramics have been considered as good candidates for plasma facing materials due to their combination of high melting point, high strength and hardness, high thermal conductivity as well as good chemical inertness. In this study, zirconium diboride has been chosen to investigate its irradiation damage behavior. Irradiated by 4 MeV Au2+ with a total fluence of 2.5 × 1016/cm2, zirconium diboride ceramic shows substantial resilience to irradiation-induced damage with its structural integrity well maintained but mild damage at lattice level. Grazing incident X-ray diffraction evidences no change of the hexagonal structure in the irradiated region but its lattice parameter a increased and c decreased, giving a volume shrinkage of ∼0.46%. Density functional theory calculation shows that such lattice shrinkage corresponds to a non-stoichiometric compound as ZrB1.97. Electron energy-loss spectroscopy in a transmission electron microscope revealed an increase of valence electrons in zirconium, suggesting boron vacancies were indeed developed by the irradiation. Along the irradiation depth, long dislocations were observed inside top layer with a depth of ∼750 nm where the implanted Au ions reached the peak concentration. Underneath the top layer, a high density of Frank dislocations is formed by the cascade collision down to a depth of 1150 nm. All the features show the potential of ZrB2 to be used as structural material in nuclear system.

Funding

National Natural Science Foundation of China (51532009), Science and Technology Commission of Shanghai Municipality (16DZ2260603, 18ZR1401400), Shanghai Technical Platform for Testing and Characterization on Inorganic Materials (19DZ2290700), and Loughborough University's PhD studentship.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Journal of Materials Science & Technology

Volume

72

Pages

223-230

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Journal of Materials Science & Technology and the definitive published version is available at https://doi.org/10.1016/j.jmst.2020.09.019.

Acceptance date

13/09/2020

Publication date

2020-09-28

Copyright date

2020

ISSN

1005-0302

Language

en

Depositor

Dr Houzheng Wu. Deposit date: 3 October 2020