TEM and HRTEM study of oxide particles in an Al-alloyed high-Cr oxide dispersion strengthened ferritic steel with Hf addition

Peng Dou, Akihiko Kimura, Ryuta Kasada, Takanari Okuda, Masaki Inoue, Shigeharu Ukai, Somei Ohnuki, Toshiharu Fujisawa, Fujio Abe, Shan Jiang, Zhigang Yang

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The nanoparticles in an Al-alloyed high-Cr oxide dispersion strengthened (ODS) ferritic steel with Hf addition, i.e., SOC-16 (Fe-15Cr-2W-0.1Ti-4Al-0.62Hf-0.35Y2O3), have been examined by transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM). Relative to an Al-alloyed high-Cr ODS ferritic steel without Hf addition, i.e., SOC-9 (Fe-15.5Cr-2W-0.1Ti-4Al-0.35Y2O3), the dispersion morphology and coherency of the oxide nanoparticles in SOC-16 were significantly improved. Almost all the small nanoparticles (diameter <10 nm) in SOC-16 were found to be consistent with cubic Y2Hf2O7 oxides with the anion-deficient fluorite structure and coherent with the bcc steel matrix. The larger particles (diameter >10 nm) were also mainly identified as cubic Y2Hf2O7 oxides with the anion-deficient fluorite structure. The results presented here are compared with those of SOC-9 with a brief discussion of the underlying mechanisms of the unusual thermal and irradiation stabilities of the oxides as well as the superior strength, excellent irradiation tolerance and extraordinary corrosion resistance of SOC-16.

Original languageEnglish
Pages (from-to)189-201
Number of pages13
JournalJournal of Nuclear Materials
Volume485
DOIs
Publication statusPublished - 2017 Mar 1
Externally publishedYes

Keywords

  • Coherency
  • High resolution transmission electron microscopy (HRTEM)
  • Misfit moiré fringes
  • Oxide-dispersion-strengthened (ODS) steel
  • Transmission electron microscopy (TEM)

ASJC Scopus subject areas

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

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