He-cavity accumulation at oxide particle-matrix interface in Ni-base ODS superalloy

Azusa Konno, Naoko H. Oono, Shigeharu Ukai, Sosuke Kondo, Okinobu Hashitomi, Akihiko Kimura

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Ni-based ODS superalloy is found to be an effective candidate for a core material of Gen. IV nuclear reactors by means of a Fe/He dual-ion bombardment simulation technique. It accumulates He cavities at the dispersed oxide particle/matrix interface, and avoids the aggregation of the cavities at the other sinks even after the irradiation up to 100.1 dpa at 1000°C. Swelling was reduced less than 1%. Cavity growth and sink strengths were estimated based on TEM observation and the rate theory. The estimations support the capability of the oxide particles for trapping the He cavities and suppressing their accumulation at grain boundaries.

Original languageEnglish
Pages (from-to)1636-1639
Number of pages4
JournalMaterials Transactions
Volume58
Issue number12
DOIs
Publication statusPublished - 2017 Jan 1
Externally publishedYes

Keywords

  • Cavity
  • Irradiation damage
  • Nickel-based superalloy
  • ODS
  • Transmutated helium

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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