Identification of the nature of neutron-irradiation-induced small point defect clusters in nickel by means of electron irradiation and defect structure development from collision cascade

Y. Ogasawara, Y. Satoh, S. Arai, M. Kiritani

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

In order to identify the nature of small point defect clusters produced from cascade collisions, either made of interstitials or vacancies, an effective method is introduced in which the identification is made from the behavior of defects under electron irradiation. Material investigated is nickel neutron-irradiated with several facilities. Under electron irradiation, neutron-irradiation-induced defects having stacking fault tetrahedron (SFT) contrast shrank and disappeared, others having dislocation loop contrast grew. Majority of extremely small defects (≤ 1 nm), over 3/4 of all the defect clusters (bulk, 300 K) and about 95% of all the defect clusters (thin foil, 573 K), disappeared and are clarified to be of vacancy type. The size and spatial distributions of defect clusters, in foil specimens and comparison of defect structures in thin foils with those in bulk disclosed the role of freely migrating interstitials.

Original languageEnglish
Pages (from-to)287-308
Number of pages22
JournalRadiation Effects and Defects in Solids
Volume139
Issue number4
DOIs
Publication statusPublished - 1996

Keywords

  • Collision cascades
  • Electron irradiation
  • Neutron irradiation
  • Point defect clusters
  • Point defect processes
  • Radiation damage microstructure

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Condensed Matter Physics

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