Subsurface damage in alumina and alumina-silicon carbide nanocomposites
The subsurface plastic deformation below alumina (Al 2O 3) and Al 2O 3-silicon carbide (SiC) nanocomposite surfaces subjected to grinding, polishing and annealing has been measured by high-resolution gra...
| Príomhchruthaitheoirí: | , , , |
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| Formáid: | Journal article |
| Teanga: | English |
| Foilsithe / Cruthaithe: |
2004
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| _version_ | 1826292957408395264 |
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| author | Tanner, B Wu, H Roberts, S Hase, T |
| author_facet | Tanner, B Wu, H Roberts, S Hase, T |
| author_sort | Tanner, B |
| collection | OXFORD |
| description | The subsurface plastic deformation below alumina (Al 2O 3) and Al 2O 3-silicon carbide (SiC) nanocomposite surfaces subjected to grinding, polishing and annealing has been measured by high-resolution grazing-incidence parallel-beam X-ray powder diffraction and transmission electron microscopy. The variation with angle in the full width at half-height maximum (FWHM) of the X-ray Bragg peaks was successfully modelled by a FWHM distribution that fell exponentially with increasing depth. Consistent parameters were extracted from data taken using both prism and pyramidal reflecting planes. Correlation was found between the depth at which the FWHM fell to 1/e of the surface value and the depth of damage observed by transmission electron microscopy. The associated surface strain in the nanocomposite was found to increase linearly with increasing diameter of the diamond polishing particles. In ground 5 vol.% SiC nanocomposite, these random surface strains fell by a factor of 7 and the depth of damage increased by a factor of 3 after annealing at 1250°C for 2 h. No differences were observed in the Bragg peak FWHM as a function of angle for material polished with 1 μm diamond grit before and after annealing. |
| first_indexed | 2024-03-07T03:22:42Z |
| format | Journal article |
| id | oxford-uuid:b7f92a81-d8e2-4920-9f09-3b30524a54ba |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:22:42Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | oxford-uuid:b7f92a81-d8e2-4920-9f09-3b30524a54ba2022-03-27T04:52:34ZSubsurface damage in alumina and alumina-silicon carbide nanocompositesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b7f92a81-d8e2-4920-9f09-3b30524a54baEnglishSymplectic Elements at Oxford2004Tanner, BWu, HRoberts, SHase, TThe subsurface plastic deformation below alumina (Al 2O 3) and Al 2O 3-silicon carbide (SiC) nanocomposite surfaces subjected to grinding, polishing and annealing has been measured by high-resolution grazing-incidence parallel-beam X-ray powder diffraction and transmission electron microscopy. The variation with angle in the full width at half-height maximum (FWHM) of the X-ray Bragg peaks was successfully modelled by a FWHM distribution that fell exponentially with increasing depth. Consistent parameters were extracted from data taken using both prism and pyramidal reflecting planes. Correlation was found between the depth at which the FWHM fell to 1/e of the surface value and the depth of damage observed by transmission electron microscopy. The associated surface strain in the nanocomposite was found to increase linearly with increasing diameter of the diamond polishing particles. In ground 5 vol.% SiC nanocomposite, these random surface strains fell by a factor of 7 and the depth of damage increased by a factor of 3 after annealing at 1250°C for 2 h. No differences were observed in the Bragg peak FWHM as a function of angle for material polished with 1 μm diamond grit before and after annealing. |
| spellingShingle | Tanner, B Wu, H Roberts, S Hase, T Subsurface damage in alumina and alumina-silicon carbide nanocomposites |
| title | Subsurface damage in alumina and alumina-silicon carbide nanocomposites |
| title_full | Subsurface damage in alumina and alumina-silicon carbide nanocomposites |
| title_fullStr | Subsurface damage in alumina and alumina-silicon carbide nanocomposites |
| title_full_unstemmed | Subsurface damage in alumina and alumina-silicon carbide nanocomposites |
| title_short | Subsurface damage in alumina and alumina-silicon carbide nanocomposites |
| title_sort | subsurface damage in alumina and alumina silicon carbide nanocomposites |
| work_keys_str_mv | AT tannerb subsurfacedamageinaluminaandaluminasiliconcarbidenanocomposites AT wuh subsurfacedamageinaluminaandaluminasiliconcarbidenanocomposites AT robertss subsurfacedamageinaluminaandaluminasiliconcarbidenanocomposites AT haset subsurfacedamageinaluminaandaluminasiliconcarbidenanocomposites |