Atom probe study of irradiation-enhanced α precipitation in neutron-irradiated Fe-Cr model alloys

Wei Ying Chen, Yinbin Miao, Yaqiao Wu, Carolyn A. Tomchik, Kun Mo, Jian Gan, Maria A. Okuniewski, Stuart A. Maloy, James F. Stubbins

Research output: Contribution to journalArticle

Abstract

Atom probe tomography (APT) was performed to study the effects of Cr concentrations, irradiation doses and irradiation temperatures on α phase formation in Fe-Cr model alloys (10-16 at.%) irradiated at 300 and 450 °C to 0.01, 0.1 and 1 dpa. For 1 dpa specimens, α precipitates with an average radius of 1.0-1.3 nm were observed. The precipitate density varied significantly from 1.1 × 1023 to 2.7 × 1024 1/m3, depending on Cr concentrations and irradiation temperatures. The volume fraction of α phase in 1 dpa specimens qualitatively agreed with the phase diagram prediction. For 0.01 dpa and 0.1 dpa, frequency distribution analysis detected slight Cr segregation in high-Cr specimens, but not in Fe-10Cr specimens. Proximity histogram analysis showed that the radial Cr concentration was highest at the center of α precipitates. For most precipitates, the Cr contents were significantly lower than that predicted by the phase diagram. The Cr concentration at precipitate center increased with increasing precipitate size.

Original languageEnglish (US)
Pages (from-to)242-249
Number of pages8
JournalJournal of Nuclear Materials
Volume462
DOIs
StatePublished - Jul 1 2015

ASJC Scopus subject areas

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

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