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Helium entrapment in a nanostructured ferritic alloy

Authors
Journal
Scripta Materialia
1359-6462
Publisher
Elsevier
Publication Date
Volume
65
Issue
8
Identifiers
DOI: 10.1016/j.scriptamat.2011.07.024
Keywords
  • Helium Irradiation
  • Radiation Tolerance
  • Nanostructured Ferritic Alloys
  • Atom Probe Tomography
  • Transmission Electron Microscopy
Disciplines
  • Design
  • Medicine

Abstract

A nanostructured ferritic alloy was irradiated with He + to simulate service in a nuclear reactor and to test the hypothesis that the surface of nanoclusters is a preferential nucleation site for He bubbles. Transmission electron microscopy and atom probe tomography showed direct evidence of He bubble nucleation on the surfaces of nanoclusters and Ti(N,C) precipitates, and along grain boundaries and dislocations, thereby demonstrating an alloy design approach to improve the radiation tolerance of structural steels in the extreme environments found in nuclear reactors.

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