Nuclear Engineering and Technology

  • 제54권3호
  • /
  • Pages.991-996
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  • 2022
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Radiation damage analysis in SiC microstructure by transmission electron microscopy

  • Idris, Mohd Idzat (The National University of Malaysia, Department of Applied Physics, Faculty of Science and Technology) ;
  • Yoshida, Katsumi (Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology) ;
  • Yano, Toyohiko (Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology)
  • 투고 : 2021.07.12
  • 심사 : 2021.09.15
  • 발행 : 2022.03.25
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초록

Microstructures of monolithic high purity SiC and SiC with sintering additives after neutron irradiation to a fluence of 2.0-2.5 × 1024 n/m2 (E > 0.1 MeV) at 333-363 K and after post-irradiation annealing up to 1673 K were observed using a transmission electron microscopy. Results showed that no black spot defects or dislocation loops in SiC grains were found after the neutron irradiation for all of the specimens owing to the moderate fluence at low irradiation temperature. Thus, it is confirmed that these specimens were swelled mostly by the formation of point defects. Black spots and small dislocation loops were discovered only after the annealing process in PureBeta-SiC and CVD-SiC, where the swelling almost diminished. Anomalous-shaped YAG grains were found in SiC ceramics containing sintering additives. These grains contained dense black spots defects and might lose crystallinity after the neutron irradiation, while these defects may annihilate by recrystallization during annealing up to 1673 K. Amorphous grain boundary phase was also presented in this ceramic, and a large part of it was crystallized through post-irradiation annealing and could affect their recovery behavior.

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과제정보

The study was partly supported by a university's grant (GUP-2018-154 and KRA-2018-057) and by the Japan Atomic Energy Agency through ITER-BA activity. The irradiation experiments were performed with support from the staff of the International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University.

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