Ductile deformation in alumina/silicon carbide nanocomposites
A transmission electron microscope study on cross sections obtained from ground and polished surfaces has revealed that ductile deformation is dominated by dislocations in alumina/silicon carbide nanocomposites containing 1, 5 and 10 vol% silicon carbide particles, and by twinning in unreinforced al...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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2010
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| _version_ | 1797080068484235264 |
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| author | Wu, H Roberts, S Derby, B |
| author_facet | Wu, H Roberts, S Derby, B |
| author_sort | Wu, H |
| collection | OXFORD |
| description | A transmission electron microscope study on cross sections obtained from ground and polished surfaces has revealed that ductile deformation is dominated by dislocations in alumina/silicon carbide nanocomposites containing 1, 5 and 10 vol% silicon carbide particles, and by twinning in unreinforced alumina. The dispersed silicon carbide particles in alumina/silicon carbide nanocomposites restrict the motion of dislocations. A dislocation pinning model is used to compare the possible mechanisms of deformation in alumina and the nanocomposites. Cr-fluorescence piezospectroscopy has been used to characterise the residual stress levels in the materials studied. The measured broadening of the Al2O3/Cr3+ fluorescence peak indicates a dislocation density of 7.3-9.7 x1016 m-2 under the indentations in the nanocomposites, whilst the beneath indentations in alumina is 1-2 orders of magnitude smaller. |
| first_indexed | 2024-03-07T00:54:51Z |
| format | Journal article |
| id | oxford-uuid:87b1f7f4-06e1-47a2-8af4-48ef836ec41d |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:54:51Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | oxford-uuid:87b1f7f4-06e1-47a2-8af4-48ef836ec41d2022-03-26T22:12:16ZDuctile deformation in alumina/silicon carbide nanocompositesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:87b1f7f4-06e1-47a2-8af4-48ef836ec41dEnglishSymplectic Elements at Oxford2010Wu, HRoberts, SDerby, BA transmission electron microscope study on cross sections obtained from ground and polished surfaces has revealed that ductile deformation is dominated by dislocations in alumina/silicon carbide nanocomposites containing 1, 5 and 10 vol% silicon carbide particles, and by twinning in unreinforced alumina. The dispersed silicon carbide particles in alumina/silicon carbide nanocomposites restrict the motion of dislocations. A dislocation pinning model is used to compare the possible mechanisms of deformation in alumina and the nanocomposites. Cr-fluorescence piezospectroscopy has been used to characterise the residual stress levels in the materials studied. The measured broadening of the Al2O3/Cr3+ fluorescence peak indicates a dislocation density of 7.3-9.7 x1016 m-2 under the indentations in the nanocomposites, whilst the beneath indentations in alumina is 1-2 orders of magnitude smaller. |
| spellingShingle | Wu, H Roberts, S Derby, B Ductile deformation in alumina/silicon carbide nanocomposites |
| title | Ductile deformation in alumina/silicon carbide nanocomposites |
| title_full | Ductile deformation in alumina/silicon carbide nanocomposites |
| title_fullStr | Ductile deformation in alumina/silicon carbide nanocomposites |
| title_full_unstemmed | Ductile deformation in alumina/silicon carbide nanocomposites |
| title_short | Ductile deformation in alumina/silicon carbide nanocomposites |
| title_sort | ductile deformation in alumina silicon carbide nanocomposites |
| work_keys_str_mv | AT wuh ductiledeformationinaluminasiliconcarbidenanocomposites AT robertss ductiledeformationinaluminasiliconcarbidenanocomposites AT derbyb ductiledeformationinaluminasiliconcarbidenanocomposites |