Helium-Ion-Implantation in Tungsten: Progress towards a Coherent Understanding of the Damage Formed and its Effects on Properties
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-di...
| Main Authors: | , , , , , , , , , , |
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Elsevier
2018
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| Online Access: | http://hdl.handle.net/1721.1/113411 https://orcid.org/0000-0002-8574-6033 https://orcid.org/0000-0001-7804-5418 |
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| author | 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 Nelson, Keith Adam |
| author2 | Massachusetts Institute of Technology. Department of Chemistry |
| author_facet | Massachusetts Institute of Technology. Department of Chemistry 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 Nelson, Keith Adam |
| author_sort | Hofmann, F. |
| collection | MIT |
| description | 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 |
| first_indexed | 2024-09-23T16:28:03Z |
| format | Article |
| id | mit-1721.1/113411 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T16:28:03Z |
| publishDate | 2018 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/1134112022-10-02T08:07:18Z Helium-Ion-Implantation in Tungsten: Progress towards a Coherent Understanding of the Damage Formed and its Effects on Properties 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 Nelson, Keith Adam Massachusetts Institute of Technology. Department of Chemistry Duncan, Ryan Andrew Maznev, Alexei Nelson, Keith Adam 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 National Science Foundation (U.S.) (Grant CHE-1111557) 2018-02-05T15:28:02Z 2018-02-05T15:28:02Z 2017-06 2018-01-31T14:41:14Z Article http://purl.org/eprint/type/JournalArticle 2210-9838 http://hdl.handle.net/1721.1/113411 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) https://orcid.org/0000-0002-8574-6033 https://orcid.org/0000-0001-7804-5418 http://dx.doi.org/10.1016/J.PIUTAM.2017.03.040 Procedia IUTAM Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier Elsevier |
| spellingShingle | 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 Nelson, Keith Adam Helium-Ion-Implantation in Tungsten: Progress towards a Coherent Understanding of the Damage Formed and its Effects on Properties |
| title | Helium-Ion-Implantation in Tungsten: Progress towards a Coherent Understanding of the Damage Formed and its Effects on Properties |
| title_full | Helium-Ion-Implantation in Tungsten: Progress towards a Coherent Understanding of the Damage Formed and its Effects on Properties |
| title_fullStr | Helium-Ion-Implantation in Tungsten: Progress towards a Coherent Understanding of the Damage Formed and its Effects on Properties |
| title_full_unstemmed | Helium-Ion-Implantation in Tungsten: Progress towards a Coherent Understanding of the Damage Formed and its Effects on Properties |
| title_short | Helium-Ion-Implantation in Tungsten: Progress towards a Coherent Understanding of the Damage Formed and its Effects on Properties |
| title_sort | helium ion implantation in tungsten progress towards a coherent understanding of the damage formed and its effects on properties |
| url | http://hdl.handle.net/1721.1/113411 https://orcid.org/0000-0002-8574-6033 https://orcid.org/0000-0001-7804-5418 |
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