Identification of ultra-fine Ti-rich precipitates in V-Cr-Ti alloys irradiated below 300 °C by using positron CDB technique

Ken ichi Fukumoto, Hideki Matsui, Hideaki Ohkubo, Zheng Tang, Yasuyoshi Nagai, Masayuki Hasegawa

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Irradiation-induced Ti-rich precipitates in V-Ti and V-4Cr-4Ti alloys are studied by TEM and positron annihilation methods (positron lifetime, and coincidence Doppler broadening (CDB)). The characteristics of small defect clusters formed in V alloys containing Ti at irradiation temperatures below 300 °C have not been identified by TEM techniques. Strong interaction between vacancy and Ti solute atoms for irradiated V alloys containing Ti at irradiation temperatures from 220 to 350 °C are observed by positron lifetime measurement. The vacancy-multi Ti solute complexes in V-alloys containing Ti are definitely identified by using CDB measurement. It is suggested that ultra-fine Ti-rich precipitates or Ti segregation at periphery of dislocation loops are formed in V alloys containing Ti at irradiation temperatures below 300 °C.

Original languageEnglish
Pages (from-to)289-294
Number of pages6
JournalJournal of Nuclear Materials
Volume373
Issue number1-3
DOIs
Publication statusPublished - 2008 Feb 15

ASJC Scopus subject areas

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

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