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A molecular dynamics study on the influence of vacancies and interstitial helium on mechanical properties of tungsten

Petersson, C. Leon M. LU ; Fredriksson, Allan ; Melin, Solveig LU ; Ahadi, Aylin LU and Hansson, Per LU (2023) In Journal of Nuclear Materials 580.
Abstract

Tungsten is a prime candidate material for use in plasma facing components in nuclear fusion reactors. This would entail weathering extreme conditions, such as high thermal loads and particle bombardment. It is of vital importance to understand how tungsten mechanically responds to these conditions, and how it is impacted by the defects that form. The current communication considers how the mechanical properties of tungsten are affected by the presence of several nanosized lattice defects: interstitial helium (both scattered throughout the sample and centrally clustered), isolated vacancies and vacancy clusters. All defects were found to lower the yield stress of the crystal, with vacancies and vacancy clusters having negligible... (More)

Tungsten is a prime candidate material for use in plasma facing components in nuclear fusion reactors. This would entail weathering extreme conditions, such as high thermal loads and particle bombardment. It is of vital importance to understand how tungsten mechanically responds to these conditions, and how it is impacted by the defects that form. The current communication considers how the mechanical properties of tungsten are affected by the presence of several nanosized lattice defects: interstitial helium (both scattered throughout the sample and centrally clustered), isolated vacancies and vacancy clusters. All defects were found to lower the yield stress of the crystal, with vacancies and vacancy clusters having negligible influence during the elastic phase. Interstitial helium formed clusters, leading to the displacement of tungsten atoms, and a lowered stiffness at high strains. These negative effects of interstitial helium — along with the decrease in yield stress — were found to be partially negated by the presence of vacancies.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Nuclear Materials
volume
580
article number
154378
publisher
Elsevier
external identifiers
  • scopus:85151715308
ISSN
0022-3115
DOI
10.1016/j.jnucmat.2023.154378
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2023 The Author(s)
id
6e37e357-6a59-458b-a6c5-253cdf98deee
date added to LUP
2023-04-17 08:53:40
date last changed
2023-11-08 04:52:45
@article{6e37e357-6a59-458b-a6c5-253cdf98deee,
  abstract     = {{<p>Tungsten is a prime candidate material for use in plasma facing components in nuclear fusion reactors. This would entail weathering extreme conditions, such as high thermal loads and particle bombardment. It is of vital importance to understand how tungsten mechanically responds to these conditions, and how it is impacted by the defects that form. The current communication considers how the mechanical properties of tungsten are affected by the presence of several nanosized lattice defects: interstitial helium (both scattered throughout the sample and centrally clustered), isolated vacancies and vacancy clusters. All defects were found to lower the yield stress of the crystal, with vacancies and vacancy clusters having negligible influence during the elastic phase. Interstitial helium formed clusters, leading to the displacement of tungsten atoms, and a lowered stiffness at high strains. These negative effects of interstitial helium — along with the decrease in yield stress — were found to be partially negated by the presence of vacancies.</p>}},
  author       = {{Petersson, C. Leon M. and Fredriksson, Allan and Melin, Solveig and Ahadi, Aylin and Hansson, Per}},
  issn         = {{0022-3115}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Nuclear Materials}},
  title        = {{A molecular dynamics study on the influence of vacancies and interstitial helium on mechanical properties of tungsten}},
  url          = {{http://dx.doi.org/10.1016/j.jnucmat.2023.154378}},
  doi          = {{10.1016/j.jnucmat.2023.154378}},
  volume       = {{580}},
  year         = {{2023}},
}