Effect of electron- and neutron-irradiation on Fe-Cu model alloys studied by positron annihilation spectroscopy

Research output: Contribution to journalArticle

Authors

  • Yasuyoshi Nagai
  • K. Takadate
  • Zikang Tang
  • H. Ohkubo
  • H. Sunaga
  • H. Takizawa
  • M. Hasegawa

Institutes & Expert groups

  • Tohoku University - Institute for Materials Research
  • East China Normal University
  • JAEA - Japan Atomic Energy Agency
  • Tohoku University - CYRIC - Cyclotron and Radioisotope Center

Documents & links

Abstract

Electron- and neutron-irradiation effects on dilute Fe-Cu model alloys of nuclear reactor pressure vessel steels are studied by positron annihilation spectroscopy. We have found that, not only by high-dose neutron-irradiation but also by low-dose electron-irradiation, the aggregation of Cu atoms and vacancies takes place and the ultrafine Cu precipitates are formed after post-irradiation annealing at 400°C. In spite of large difference in the irradiation doses between the electron- and the neutron-irradiated samples, no significant difference is observed in the isochronal annealing behaviour above 400°C of positron annihilation and micro-hardness, indicating that small amount of extra vacancies enhance the aggregation of Cu atoms in Fe during the annealing-out process of the vacancies.

Details

Original languageEnglish
Article number012007
Pages (from-to)1-7
Number of pages7
JournalJournal of Physics: Conference Series
Volume265
DOIs
Publication statusPublished - 2011

Keywords

  • Positron annihalation spectroscopy

ID: 6869183