Nuclear Engineering and Technology

  • 제56권4호
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  • Pages.1490-1500
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  • 2024
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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TEM investigation of helium bubble evolution in tungsten and ZrC-strengthened tungsten at 800 and 1000℃ under 40keV He+ irradiation

  • I. Ipatova (Culham Centre for Fusion Energy, United Kingdom Atomic Energy Authority, Culham Science Centre) ;
  • G. Greaves (School of Computing and Engineering, University of Huddersfield) ;
  • D. Terentyev (Belgium Nuclear Research Center) ;
  • M.R. Gilbert (Culham Centre for Fusion Energy, United Kingdom Atomic Energy Authority, Culham Science Centre) ;
  • Y.-L. Chiu (School of Metallurgy and Materials, University of Birmingham)
  • 투고 : 2023.07.04
  • 심사 : 2023.12.01
  • 발행 : 2024.04.25
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초록

Helium-induced defect nucleation and accumulation in polycrystalline W and W0.5 wt%ZrC (W0.5ZrC) were studied in-situ using the transmission electron microscopy (TEM) combined with 40 keV He+ irradiation at 800 and 1000℃ at the maximum damage level of 1 dpa. Radiation-induced dislocation loops were not observed in the current study. W0.5ZrC was found to be less susceptible to irradiation damage in terms of helium bubble formation and growth, especially at lower temperature (800 ℃) when vacancies were less mobile. The ZrC particles present in the W matrix pin the forming helium bubbles via interaction between C atom and neighbouring W atom at vacancies. This reduces the capability of helium to trap a vacancy which is required to form the bubble core and, as a consequence, delays, the bubble nucleation. At 1000 ℃, significant bubble growth occurred in both materials and all the present bubbles transitioned from spherical to faceted shape, whereas at 800 ℃, the faceted helium bubble population was dominated in W.

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과제정보

The authors of this work acknowledge Prof S. E. Donnelly for access to the MIAMI-2 facility (grant ref. EPSRC EP/M028283/1) through the EPSRC-funded mid-range facility, the UK National Ion Beam Centre (NS/A000059/1). This work has been part-funded by the EPSRC Energy Programme [grant number EP/W006839/1]. The authors acknowledge Prof Yu Lung Chiu and the Centre for Electron Microscopy at the University of Birmingham for the provided support and assistance.

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