Helium-Ion-Implantation in Tungsten: Progress towards a Coherent Understanding of the Damage Formed and its Effects on Properties
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Author(s)
Hofmann, F.
Nguyen-Manh, D.
Mason, D.R.
Gilbert, M.R.
Dudarev, S.L.
Eliason, J.K.
Beck, C.E.
Liu, W.
Duncan, Ryan Andrew
Maznev, Alexei
Date Issued
June 2017
Journal
Procedia IUTAM
Publisher
Elsevier
Citation
Hofmann, F. et al. “Helium-Ion-Implantation in Tungsten: Progress Towards a Coherent Understanding of the Damage Formed and Its Effects on Properties.” Procedia IUTAM 21 (June 2017): 78–85 © 2017 The Author(s)
Version
Final published version
Abstract
Tungsten is a likely material for divertor armour in fusion reactors. We describe recent progress combining multi-technique experiments with atomistic modelling to understand how injected helium interacts with displacement damage and modifies the physical properties of tungsten. Using X-ray micro-diffraction and laser-induced transient grating measurements, we observe both a lattice swelling and modulus change after helium implantation. Surprisingly, a fraction of a percent lattice expansion is associated with an order of magnitude larger reduction in elastic modulus. These observations are interpreted using a combined elasticity and density functional theory model. We also measure a large reduction of thermal diffusivity due to helium implantation. This can be explained in terms of the underlying damage microstructure using a new atomistic kinetic theory model. Together our observations and calculations allow us to begin to form a joined-up picture of helium-implantation-induced damage in tungsten and its diverse effects on microstructure and physical properties. Keywords: tungsten; ion implantation; helium laue micro-diffraction; surface acoustic waves; thermal transport
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/J.PIUTAM.2017.03.040
