Grain size threshold for enhanced irradiation resistance in nanocrystalline and ultrafine tungsten

O. El-Atwani, J. A. Hinks, G. Greaves, J. P. Allain, S. A. Maloy

Research output: Contribution to journalArticlepeer-review

Abstract

Nanocrystalline metals are considered highly radiation-resistant materials due to their large grain boundary areas. Here, the existence of a grain size threshold for enhanced irradiation resistance in high-temperature helium-irradiated nanocrystalline and ultrafine tungsten is demonstrated. Average bubble density, projected bubble area and the corresponding change in volume were measured via transmission electron microscopy and plotted as a function of grain size for two ion fluences. Nanocrystalline grains of less than 35 nm size possess ∼10–20 times lower change in volume than ultrafine grains and this is discussed in terms of the grain boundaries defect sink efficiency.

Original languageEnglish (US)
Pages (from-to)343-349
Number of pages7
JournalMaterials Research Letters
Volume5
Issue number5
DOIs
StatePublished - Sep 3 2017

Keywords

  • He implantation
  • TEM
  • bubbles
  • grain boundary
  • nanocrystalline

ASJC Scopus subject areas

  • Materials Science(all)

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