Nanoindentation investigation of micro-fracture wear mechanisms in polycrystalline alumina
The initiation of surface damage under point loading has been investigated in polycrystalline alumina materials using low load continuous depth-sensing indentation equipment (nanoindentation). Pure alumina and liquid phase sintered materials containing 10% by weight of magnesium or calcium monosilic...
| Main Authors: | , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2002
|
| _version_ | 1797077900573278208 |
|---|---|
| author | Twigg, P Riley, F Roberts, S |
| author_facet | Twigg, P Riley, F Roberts, S |
| author_sort | Twigg, P |
| collection | OXFORD |
| description | The initiation of surface damage under point loading has been investigated in polycrystalline alumina materials using low load continuous depth-sensing indentation equipment (nanoindentation). Pure alumina and liquid phase sintered materials containing 10% by weight of magnesium or calcium monosilicate have been examined and data obtained from plots of displacement as a function of load assessed in relation to erosive wear rates. In the pure alumina material, discontinuities ("pop-ins") in the load-displacement trace appear to be associated with the induction of radial cracking around a plastic impression. The pop-ins provide information on the indentation load at which fracture was initiated, and an estimate of the energy associated with crack formation. SEM imaging of the indentations before and after etching allowed crack paths to be related to microstructural features. |
| first_indexed | 2024-03-07T00:24:41Z |
| format | Journal article |
| id | oxford-uuid:7dba3c23-e59f-4e14-bd52-46b08f63dbef |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:24:41Z |
| publishDate | 2002 |
| record_format | dspace |
| spelling | oxford-uuid:7dba3c23-e59f-4e14-bd52-46b08f63dbef2022-03-26T21:05:31ZNanoindentation investigation of micro-fracture wear mechanisms in polycrystalline aluminaJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7dba3c23-e59f-4e14-bd52-46b08f63dbefEnglishSymplectic Elements at Oxford2002Twigg, PRiley, FRoberts, SThe initiation of surface damage under point loading has been investigated in polycrystalline alumina materials using low load continuous depth-sensing indentation equipment (nanoindentation). Pure alumina and liquid phase sintered materials containing 10% by weight of magnesium or calcium monosilicate have been examined and data obtained from plots of displacement as a function of load assessed in relation to erosive wear rates. In the pure alumina material, discontinuities ("pop-ins") in the load-displacement trace appear to be associated with the induction of radial cracking around a plastic impression. The pop-ins provide information on the indentation load at which fracture was initiated, and an estimate of the energy associated with crack formation. SEM imaging of the indentations before and after etching allowed crack paths to be related to microstructural features. |
| spellingShingle | Twigg, P Riley, F Roberts, S Nanoindentation investigation of micro-fracture wear mechanisms in polycrystalline alumina |
| title | Nanoindentation investigation of micro-fracture wear mechanisms in polycrystalline alumina |
| title_full | Nanoindentation investigation of micro-fracture wear mechanisms in polycrystalline alumina |
| title_fullStr | Nanoindentation investigation of micro-fracture wear mechanisms in polycrystalline alumina |
| title_full_unstemmed | Nanoindentation investigation of micro-fracture wear mechanisms in polycrystalline alumina |
| title_short | Nanoindentation investigation of micro-fracture wear mechanisms in polycrystalline alumina |
| title_sort | nanoindentation investigation of micro fracture wear mechanisms in polycrystalline alumina |
| work_keys_str_mv | AT twiggp nanoindentationinvestigationofmicrofracturewearmechanismsinpolycrystallinealumina AT rileyf nanoindentationinvestigationofmicrofracturewearmechanismsinpolycrystallinealumina AT robertss nanoindentationinvestigationofmicrofracturewearmechanismsinpolycrystallinealumina |