Defect clusters formed from large collision cascades in fcc metals irradiated with spallation neutrons

Y. Satoh, Y. Matsuda, T. Yoshiie, M. Kawai, H. Matsumura, H. Iwase, Hiroaki Abe, S. W. Kim, Tetsuya Matsunaga

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Abstract

Fcc pure metals were irradiated with spallation neutrons (energies up to 500 MeV) at room temperature to a neutron fluence of 1 × 1018 n m-2 at KENS, High Energy Accelerator Research Organization (KEK). Defect clusters induced by large collision cascades were examined using transmission electron microscopy (TEM). In Au, large groups of defects included more than 10 clusters, and the damage zone extended over 50 nm, which was larger than that induced by fusion neutron irradiation (<20 nm). Although small stacking fault tetrahedra (SFT) are formed in subcascades by fission and fusion neutron irradiation, dislocation loops were also observed in the present experiments. Large dislocation loops (>10 nm) were identified as vacancy type by the conventional inside-outside contrast method. Because of the low neutron fluence, spatial overlapping of collision cascades was ignored. Large vacancy loops are formed through cooperative reactions among subcascades in a single collision cascade with large recoil energy.

Original languageEnglish
Pages (from-to)S768-S772
JournalJournal of Nuclear Materials
Volume442
Issue number1-3 SUPPL.1
DOIs
Publication statusPublished - 2013 Feb 26

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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    Satoh, Y., Matsuda, Y., Yoshiie, T., Kawai, M., Matsumura, H., Iwase, H., Abe, H., Kim, S. W., & Matsunaga, T. (2013). Defect clusters formed from large collision cascades in fcc metals irradiated with spallation neutrons. Journal of Nuclear Materials, 442(1-3 SUPPL.1), S768-S772. https://doi.org/10.1016/j.jnucmat.2013.01.319