Stability of nanoclusters in an oxide dispersion strengthened alloy under neutron irradiation

Xiang Liu, Yinbin Miao, Yaqiao Wu, Stuart A. Maloy, James F. Stubbins

Research output: Contribution to journalArticle

Abstract

Here, we report atom probe tomography results of the nanoclusters in a neutron-irradiated oxide dispersion strengthened alloy. Following irradiation to 5 dpa at target temperatures of 300 °C and 450 °C, fewer large nanoclusters were found and the residual nanoclusters tend to reach an equilibrium Guinier radius of 1.8 nm. With increasing dose, evident decrease in peak oxygen and titanium (but not yttrium) concentrations in the nanoclusters was observed, which was explained by atomic weight, solubility, diffusivity, and chemical bonding arguments. The chemical modifications indicate the equilibrium size is indeed a balance of two competing processes: radiation enhanced diffusion and collisional dissolution.

Original languageEnglish (US)
Pages (from-to)57-61
Number of pages5
JournalScripta Materialia
Volume138
DOIs
StatePublished - Sep 2017

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Keywords

  • Atom probe tomography
  • Microstructure
  • Neutron irradiation
  • Oxide dispersion strengthened (ODS) alloy

ASJC Scopus subject areas

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

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