The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation
The effect of helium-implantation-induced defects on deformation behaviour is examined by comparing spherical nano-indents in unimplanted and helium-implanted regions of a tungsten single crystal. Helium-implantation increases hardness and causes large pileups. 3D-resolved X-ray micro-diffraction un...
| Main Authors: | , , , , , |
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| Format: | Journal article |
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Elsevier
2018
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| _version_ | 1826261977170706432 |
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| author | Das, S Armstrong, D Zayachuk, Y Liu, W Xu, R Hofmann, F |
| author_facet | Das, S Armstrong, D Zayachuk, Y Liu, W Xu, R Hofmann, F |
| author_sort | Das, S |
| collection | OXFORD |
| description | The effect of helium-implantation-induced defects on deformation behaviour is examined by comparing spherical nano-indents in unimplanted and helium-implanted regions of a tungsten single crystal. Helium-implantation increases hardness and causes large pileups. 3D-resolved X-ray micro-diffraction uniquely allows examination of the complex lattice distortions beneath specific indents. In the ion-implanted material we find reduced lattice rotations and residual strains due to indentation, indicating a more confined plastic zone. Together, our observations suggest that helium-induced defects initially act as efficient obstacles to dislocation motion, but are weakened by the subsequent passage of dislocations, causing a reduction in work hardening capacity. |
| first_indexed | 2024-03-06T19:29:04Z |
| format | Journal article |
| id | oxford-uuid:1ccf6e1a-b353-4b96-8d64-e2ac936bc12d |
| institution | University of Oxford |
| last_indexed | 2024-03-06T19:29:04Z |
| publishDate | 2018 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:1ccf6e1a-b353-4b96-8d64-e2ac936bc12d2022-03-26T11:07:44ZThe effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentationJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:1ccf6e1a-b353-4b96-8d64-e2ac936bc12dSymplectic Elements at OxfordElsevier2018Das, SArmstrong, DZayachuk, YLiu, WXu, RHofmann, FThe effect of helium-implantation-induced defects on deformation behaviour is examined by comparing spherical nano-indents in unimplanted and helium-implanted regions of a tungsten single crystal. Helium-implantation increases hardness and causes large pileups. 3D-resolved X-ray micro-diffraction uniquely allows examination of the complex lattice distortions beneath specific indents. In the ion-implanted material we find reduced lattice rotations and residual strains due to indentation, indicating a more confined plastic zone. Together, our observations suggest that helium-induced defects initially act as efficient obstacles to dislocation motion, but are weakened by the subsequent passage of dislocations, causing a reduction in work hardening capacity. |
| spellingShingle | Das, S Armstrong, D Zayachuk, Y Liu, W Xu, R Hofmann, F The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation |
| title | The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation |
| title_full | The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation |
| title_fullStr | The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation |
| title_full_unstemmed | The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation |
| title_short | The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation |
| title_sort | effect of helium implantation on the deformation behaviour of tungsten x ray micro diffraction and nanoindentation |
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