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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| Format: | Conference item |
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Elsevier
2017
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| _version_ | 1797083914008788992 |
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| author | Hofmann, F Nguyen-Manh, D Mason, DR Gilbert, MR Dudarev, SL Eliason, JK Duncan, RA Maznev, AA Nelson, KA Beck, CE Liu, W |
| author_facet | Hofmann, F Nguyen-Manh, D Mason, DR Gilbert, MR Dudarev, SL Eliason, JK Duncan, RA Maznev, AA Nelson, KA Beck, CE Liu, W |
| author_sort | Hofmann, F |
| collection | OXFORD |
| 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. |
| first_indexed | 2024-03-07T01:48:15Z |
| format | Conference item |
| id | oxford-uuid:992d58a5-d869-45ea-b985-d04ced9b65fe |
| institution | University of Oxford |
| last_indexed | 2024-03-07T01:48:15Z |
| publishDate | 2017 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:992d58a5-d869-45ea-b985-d04ced9b65fe2022-03-27T00:12:24ZHelium-ion-implantation in tungsten: Progress towards a coherent understanding of the damage formed and its effects on propertiesConference itemhttp://purl.org/coar/resource_type/c_5794uuid:992d58a5-d869-45ea-b985-d04ced9b65feSymplectic Elements at OxfordElsevier2017Hofmann, FNguyen-Manh, DMason, DRGilbert, MRDudarev, SLEliason, JKDuncan, RAMaznev, AANelson, KABeck, CELiu, WTungsten 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. |
| spellingShingle | Hofmann, F Nguyen-Manh, D Mason, DR Gilbert, MR Dudarev, SL Eliason, JK Duncan, RA Maznev, AA Nelson, KA Beck, CE Liu, W 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 |
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