Irradiation-induced Cu aggregations in Fe: An origin of embrittlement of reactor pressure vessel steels

Y. Nagai, Z. Tang, T. Kanai, M. Saneyasu, M. Hassegawa

Research output: Contribution to journalArticlepeer-review

202 Citations (Scopus)

Abstract

Very dilute Fe-Cu systems, model alloys of nuclear reactor pressure vessel (RPV) steels, irradiated by fast neutrons, are studied by positron annihilation experiments and simple calculations. The ultrafine Cu precipitates, which are never, formed by thermal aging in the dilute alloys, are observed clearly and are strongly suggested to be responsible for irradiation-induced embrittlement of RPV steels. The formation and recovery process of the precipitates are revealed: (i) irradiation-induced Cu-vacancy complexes aggregate into microvoids; (ii) around 400°C the dissociation of vacancies from the microvoids leads to the formation of the Cu precipitates of about 1 nm in size; and (iii) the Cu precipitates anneal out at about 650°C.

Original languageEnglish
Article number134110
Pages (from-to)1341101-1341105
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number13
DOIs
Publication statusPublished - 2001

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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