Size-dependent characteristics of ultra-fine oxygen-enriched nanoparticles in austenitic steels

Yinbin Miao, Kun Mo, Zhangjian Zhou, Xiang Liu, Kuan Che Lan, Guangming Zhang, Michael K. Miller, Kathy A. Powers, James F. Stubbins

Research output: Contribution to journalArticle

Abstract

Here, a coordinated investigation of the elemental composition and morphology of ultra-fine-scale nanoparticles as a function of size within a variety of austenitic oxide dispersion-strengthened (ODS) steels is reported. Atom probe tomography was utilized to evaluate the elemental composition of these nanoparticles. Meanwhile, the crystal structures and orientation relationships were determined by high-resolution transmission electron microscopy. The nanoparticles with sufficient size (>4 nm) to maintain a Y2Ti2−xO7−2x stoichiometry were found to have a pyrochlore structure, whereas smaller YxTiyOz nanoparticles lacked a well-defined structure. The size-dependent characteristics of the nanoparticles in austenitic ODS steels differ from those in ferritic/martensitic ODS steels.

Original languageEnglish (US)
Pages (from-to)195-201
Number of pages7
JournalJournal of Nuclear Materials
Volume480
DOIs
StatePublished - Nov 1 2016

Keywords

  • Atom probe tomography
  • Austenitic steels
  • High-resolution transmission electron microscopy (HRTEM)
  • Nanostructure
  • Oxide dispersion strengthened (ODS) alloy

ASJC Scopus subject areas

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

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