Positron annihilation characterization of nanostructured ferritic alloys

M. J. Alinger, S. C. Glade, B. D. Wirth, G. R. Odette, Takeshi Toyama, Yasuyoshi Nagai, M. Hasegawa

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Nanostructured ferritic alloys (NFAs) were produced by mechanically alloying Fe-14Cr-3W-0.4Ti and 0.25Y2O3 (wt%) powders followed by hot isostatic pressing consolidation at 850, 1000 and 1150 °C. Positron annihilation lifetime and orbital momentum spectroscopy measurements are in qualitative agreement with small angle neutron scattering, transmission electron microscopy and atom probe tomography observations, indicating that up to 50% of the annihilations occur at high densities of Y-Ti-O enriched nm-scale features (NFs). Some annihilations may also occur in small cavities. In Y-free control alloys, that do not contain NFs, positrons primarily annihilate in the Fe-Cr matrix and at features such as dislocations, while a small fraction annihilate in large cavities or Ar bubbles.

Original languageEnglish
Pages (from-to)150-157
Number of pages8
JournalMaterials Science and Engineering A
Volume518
Issue number1-2
DOIs
Publication statusPublished - 2009 Aug 25

Keywords

  • Ferritic steel
  • NFA
  • Nuclear materials
  • ODS
  • PAS
  • Positron

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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