Early stage damage of ultrafine-grained tungsten materials exposed to low energy helium ion irradiation

O. El-Atwani, S. Gonderman, S. Suslov, M. Efe, G. De Temmerman, T. Morgan, K. Bystrov, K. Hattar, J. P. Allain

Research output: Research - peer-reviewArticle

Abstract

Tungsten is considered as a plasma facing component in the divertor region of the International Thermonuclear Experiment Reactor (ITER). High flux, high fluence helium (He) exposure of tungsten surfaces induces severe morphology changes and nanostructure formation, which may eventually erode tungsten and risk the operation of the reactor. In this study, we investigate the response of ultrafine-grained tungsten under low flux (∼1020 ions m-2 s-1), low fluence, low energy (30-70 eV) He irradiation at different temperatures in order to study the early stage of nanostructure formation. Rod-shape nanostructures formed at low temperatures (600 °C) and a He fluence of 1 × 1023 m-2. High resolution, cross-section TEM images of irradiated grains demonstrated bubble formation not inside the nanostructures but deep inside the grains. At higher temperatures (900 °C) and the same fluence of 1 × 1023 m-2, large tungsten asperities (stone-shape and fiber-form structures), which are attributed to the burst and erosion of the surface grains. Moreover, low fluence (1020 m-2-1021 m-2) and high temperature (900 °C) irradiation demonstrated low density of non-coalesced bubbles inside the TEM samples. The results suggest that morphology changes can exist in He irradiated tungsten even with low bubble densities; thus, an additional factor such as surface stresses may dictate the observed nanostructure formation.

LanguageEnglish (US)
Pages9-14
Number of pages6
JournalFusion Engineering and Design
Volume93
DOIs
StatePublished - Apr 1 2015

Fingerprint

Tungsten
Ion bombardment
Ultrafine
Helium
Nanostructures
Temperature
Irradiation
Fluxes
Transmission electron microscopy
Bubble formation
Erosion
Ions
Plasmas
Fibers
Experiments

Keywords

  • Bubble formation
  • Fusion
  • Irradiation
  • TEM
  • Tungsten

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Materials Science(all)
  • Nuclear Energy and Engineering
  • Mechanical Engineering

Cite this

Early stage damage of ultrafine-grained tungsten materials exposed to low energy helium ion irradiation. / El-Atwani, O.; Gonderman, S.; Suslov, S.; Efe, M.; De Temmerman, G.; Morgan, T.; Bystrov, K.; Hattar, K.; Allain, J. P.

In: Fusion Engineering and Design, Vol. 93, 01.04.2015, p. 9-14.

Research output: Research - peer-reviewArticle

El-Atwani, O, Gonderman, S, Suslov, S, Efe, M, De Temmerman, G, Morgan, T, Bystrov, K, Hattar, K & Allain, JP 2015, 'Early stage damage of ultrafine-grained tungsten materials exposed to low energy helium ion irradiation' Fusion Engineering and Design, vol 93, pp. 9-14. DOI: 10.1016/j.fusengdes.2015.02.001
El-Atwani O, Gonderman S, Suslov S, Efe M, De Temmerman G, Morgan T et al. Early stage damage of ultrafine-grained tungsten materials exposed to low energy helium ion irradiation. Fusion Engineering and Design. 2015 Apr 1;93:9-14. Available from, DOI: 10.1016/j.fusengdes.2015.02.001
El-Atwani, O. ; Gonderman, S. ; Suslov, S. ; Efe, M. ; De Temmerman, G. ; Morgan, T. ; Bystrov, K. ; Hattar, K. ; Allain, J. P./ Early stage damage of ultrafine-grained tungsten materials exposed to low energy helium ion irradiation. In: Fusion Engineering and Design. 2015 ; Vol. 93. pp. 9-14
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