An improved method to model dislocation self-climb
Dislocations can provide short circuit diffusion paths for atoms resulting in a dislocation climb motion referred to as self-climb. A variational principle is presented for the analysis of problems in which fast dislocation core diffusion is the dominant mechanism for material redistribution. The li...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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IOP Publishing
2020
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| _version_ | 1797094636067487744 |
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| author | Liu, F Cocks, ACF Gill, SPA Tarleton, E |
| author_facet | Liu, F Cocks, ACF Gill, SPA Tarleton, E |
| author_sort | Liu, F |
| collection | OXFORD |
| description | Dislocations can provide short circuit diffusion paths for atoms resulting in a dislocation climb motion referred to as self-climb. A variational principle is presented for the analysis of problems in which fast dislocation core diffusion is the dominant mechanism for material redistribution. The linear element based self-climb model, developed in our previous work [1] Liu, Cocks and Tarleton (2020 J. Mech. Phys. Solids 135 103783), is significantly accelerated here, by employing a new finite element discretisation method. The speed-up in computation enables us to use the self-climb model as an effective numerical technique to simulate emergent dislocation behaviour involving both self-climb and glide. The formation of prismatic loops from the break-up of different types of edge dislocation dipoles are investigated based on this new method. We demonstrate that edge dipoles sequentially pinch-off prismatic loops, rather than spontaneously breaking-up into a string of loops, to rapidly decrease the total dislocation energy. |
| first_indexed | 2024-03-07T04:16:43Z |
| format | Journal article |
| id | oxford-uuid:c9a7c53a-372d-4559-94ed-d44bb92e1bd6 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:16:43Z |
| publishDate | 2020 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | oxford-uuid:c9a7c53a-372d-4559-94ed-d44bb92e1bd62022-03-27T07:00:59ZAn improved method to model dislocation self-climbJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c9a7c53a-372d-4559-94ed-d44bb92e1bd6EnglishSymplectic ElementsIOP Publishing2020Liu, FCocks, ACFGill, SPATarleton, EDislocations can provide short circuit diffusion paths for atoms resulting in a dislocation climb motion referred to as self-climb. A variational principle is presented for the analysis of problems in which fast dislocation core diffusion is the dominant mechanism for material redistribution. The linear element based self-climb model, developed in our previous work [1] Liu, Cocks and Tarleton (2020 J. Mech. Phys. Solids 135 103783), is significantly accelerated here, by employing a new finite element discretisation method. The speed-up in computation enables us to use the self-climb model as an effective numerical technique to simulate emergent dislocation behaviour involving both self-climb and glide. The formation of prismatic loops from the break-up of different types of edge dislocation dipoles are investigated based on this new method. We demonstrate that edge dipoles sequentially pinch-off prismatic loops, rather than spontaneously breaking-up into a string of loops, to rapidly decrease the total dislocation energy. |
| spellingShingle | Liu, F Cocks, ACF Gill, SPA Tarleton, E An improved method to model dislocation self-climb |
| title | An improved method to model dislocation self-climb |
| title_full | An improved method to model dislocation self-climb |
| title_fullStr | An improved method to model dislocation self-climb |
| title_full_unstemmed | An improved method to model dislocation self-climb |
| title_short | An improved method to model dislocation self-climb |
| title_sort | improved method to model dislocation self climb |
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