Nuclear Engineering and Technology

  • 제51권3호
  • /
  • Pages.769-775
  • /
  • 2019
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  • 1738-5733(pISSN)
  • /
  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Point defects and grain boundary effects on tensile strength of 3C-SiC studied by molecular dynamics simulations

  • Li, Yingying (Division of Nuclear Materials and Fuel, State Power Investment Corporation Research Institute) ;
  • Li, Yan (National Center for Climate Change Strategy and International Cooperation) ;
  • Xiao, Wei (Division of Nuclear Materials and Fuel, State Power Investment Corporation Research Institute)
  • 투고 : 2018.05.23
  • 심사 : 2018.12.19
  • 발행 : 2019.04.25
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초록

The tensile strength of irradiated 3C-SiC, SiC with artificial point defects, SiC with symmetric tilt grain boundaries (GBs), irradiated SiC with GBs are investigated using molecular dynamics simulations at 300 K. For an irradiated SiC sample, the tensile strength decreases with the increase of irradiation dose. The Young's modulus decreases with the increase of irradiation dose which agrees well with experiment and simulation data. For artificial point defects, the designed point defects dramatically decrease the tensile strength of SiC at low concentration. Among the point defects studied in this work, the vacancies drop the strength the most seriously. SiC symmetric tilt GBs decrease the tensile strength of pure SiC. Under irradiated condition, the tensile strengths of all SiC samples with grain boundaries decrease and converge to certain value because the structures become amorphous and the grain boundaries disappear after high dose irradiation.

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피인용 문헌

  1. Study on displacement cascade and tensile simulation by molecular dynamics: Formation and properties of point defects vol.35, pp.10, 2019, https://doi.org/10.1142/s021797922150140x