Dislocation density distribution at slip band-grain boundary intersections
We study the mechanisms of slip transfer at a grain boundary, in titanium, using Differential Aperture X-ray Laue Micro-diffraction (DAXM). This 3D characterisation tool enables measurement of the full (9-component) Nye lattice curvature tensor and calculation of the density of geometrically necessa...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Elsevier
2019
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| _version_ | 1826307172053549056 |
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| author | Guo, Y Collins, DM Tarleton, E Hofmann, F Wilkinson, AJ Britton, TB |
| author_facet | Guo, Y Collins, DM Tarleton, E Hofmann, F Wilkinson, AJ Britton, TB |
| author_sort | Guo, Y |
| collection | OXFORD |
| description | We study the mechanisms of slip transfer at a grain boundary, in titanium, using Differential Aperture X-ray Laue Micro-diffraction (DAXM). This 3D characterisation tool enables measurement of the full (9-component) Nye lattice curvature tensor and calculation of the density of geometrically necessary dislocations (GNDs). We observe dislocation pile-ups at a grain boundary, as the neighbour grain prohibits easy passage for dislocation transmission. This incompatibility results in local micro-plasticity within the slipping grain, near to where the slip planes intersect the grain boundary, and we observe bands of GNDs lying near the grain boundary. We observe that the distribution of GNDs can be significantly influenced by the formation of grain boundary ledges that serve as secondary dislocation sources. This observation highlights the non-continuum nature of polycrystal deformation and helps us understand the higher order complexity of grain boundary characteristics. |
| first_indexed | 2024-03-07T06:58:56Z |
| format | Journal article |
| id | oxford-uuid:ff14783f-94b0-434f-8df7-d72248347991 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:58:56Z |
| publishDate | 2019 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:ff14783f-94b0-434f-8df7-d722483479912022-03-27T13:41:49ZDislocation density distribution at slip band-grain boundary intersectionsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ff14783f-94b0-434f-8df7-d72248347991EnglishSymplectic Elements at OxfordElsevier2019Guo, YCollins, DMTarleton, EHofmann, FWilkinson, AJBritton, TBWe study the mechanisms of slip transfer at a grain boundary, in titanium, using Differential Aperture X-ray Laue Micro-diffraction (DAXM). This 3D characterisation tool enables measurement of the full (9-component) Nye lattice curvature tensor and calculation of the density of geometrically necessary dislocations (GNDs). We observe dislocation pile-ups at a grain boundary, as the neighbour grain prohibits easy passage for dislocation transmission. This incompatibility results in local micro-plasticity within the slipping grain, near to where the slip planes intersect the grain boundary, and we observe bands of GNDs lying near the grain boundary. We observe that the distribution of GNDs can be significantly influenced by the formation of grain boundary ledges that serve as secondary dislocation sources. This observation highlights the non-continuum nature of polycrystal deformation and helps us understand the higher order complexity of grain boundary characteristics. |
| spellingShingle | Guo, Y Collins, DM Tarleton, E Hofmann, F Wilkinson, AJ Britton, TB Dislocation density distribution at slip band-grain boundary intersections |
| title | Dislocation density distribution at slip band-grain boundary intersections |
| title_full | Dislocation density distribution at slip band-grain boundary intersections |
| title_fullStr | Dislocation density distribution at slip band-grain boundary intersections |
| title_full_unstemmed | Dislocation density distribution at slip band-grain boundary intersections |
| title_short | Dislocation density distribution at slip band-grain boundary intersections |
| title_sort | dislocation density distribution at slip band grain boundary intersections |
| work_keys_str_mv | AT guoy dislocationdensitydistributionatslipbandgrainboundaryintersections AT collinsdm dislocationdensitydistributionatslipbandgrainboundaryintersections AT tarletone dislocationdensitydistributionatslipbandgrainboundaryintersections AT hofmannf dislocationdensitydistributionatslipbandgrainboundaryintersections AT wilkinsonaj dislocationdensitydistributionatslipbandgrainboundaryintersections AT brittontb dislocationdensitydistributionatslipbandgrainboundaryintersections |