In situ synchrotron tensile investigations on 14YWT, MA957, and 9-Cr ODS alloys

Jun Li Lin, Kun Mo, Di Yun, Yinbin Miao, Xiang Liu, Huijuan Zhao, David T. Hoelzer, Jun Sang Park, Jonathan Almer, Guangming Zhang, Zhangjian Zhou, James F. Stubbins, Abdellatif M. Yacout

Research output: Contribution to journalArticlepeer-review


Advanced ODS alloys provide exceptional radiation tolerance and high-temperature mechanical properties when compared to traditional ferritic and ferritic/martensitic (F/M) steels. Their remarkable properties result from ultrahigh density and ultrafine size of Y-Ti-O nanoclusters within the ferritic matrix. In this work, we applied a high-energy synchrotron radiation X-ray to study the deformation process of three advanced ODS materials including 14YWT, MA957, and 9-Cr ODS steel. Only the relatively large nanoparticles in the 9-Cr ODS were observed in the synchrotron X-ray diffraction. The nanoclusters in both 14YWT and MA957 were invisible in the measurement due to their non-stoichiometric nature. Due to the different sizes of nanoparticles and nanoclusters in the materials, the Orowan looping was considered to be the major strengthening mechanism in the 9-Cr ODS, while the dispersed-barrier-hardening is dominant strengthening mechanism in both 14YWT and MA957, This analysis was inferred from the different build-up rates of dislocation density when plastic deformation was initiated. Finally, the dislocation densities interpreted from the X-ray measurements were successfully modeled using the Bergström's dislocation models.

Original languageEnglish (US)
Pages (from-to)289-298
Number of pages10
JournalJournal of Nuclear Materials
StatePublished - Apr 1 2016


  • Advanced ODS alloys
  • Deformation
  • Dislocation density
  • High-energy X-ray diffraction
  • In-situ tensile test

ASJC Scopus subject areas

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


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