The relationship between microstructure and fracture toughness of zirconia toughened alumina (ZTA) added with MgO and CeO2
The aim of this research is to investigate the mode of crack propagation in zirconia toughened alumina (ZTA) added with MgO and CeO2, respectively. The mode of crack refers to the toughening mechanism of the materials. Different ZTA compositions containing MgO and CeO2 as sintering additives were pr...
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| Format: | Article |
| Language: | English |
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Elsevier
2013
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| Online Access: | http://irep.iium.edu.my/33035/ http://irep.iium.edu.my/33035/1/Nik2.pdf |
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| author | Rejab, Nik Akmar Ahmad Azhar, Ahmad Zahirani Ratnam, Mani Maran Ahmad, Zainal Arifin |
| author_facet | Rejab, Nik Akmar Ahmad Azhar, Ahmad Zahirani Ratnam, Mani Maran Ahmad, Zainal Arifin |
| author_sort | Rejab, Nik Akmar |
| building | IIUM Repository |
| collection | Online Access |
| description | The aim of this research is to investigate the mode of crack propagation in zirconia toughened alumina (ZTA) added with MgO and CeO2, respectively. The mode of crack refers to the toughening mechanism of the materials. Different ZTA compositions containing MgO and CeO2 as sintering additives were prepared using pressureless sintering at 1600 °C. Each sample was subjected to Vickers indentation with 294 N load and the cracks that propagated were observed with SEM. The ZTA with an addition of 0.7 wt.% MgO showed a crack deflection with a fracture toughness value of 6.19 ± 0.26 MPa · √m. On the other hand, the ZTA with CeO2 addition of 0.5 to 7 wt.% showed both crack bridging and deflection, and produced 5.78 ± 0.16 MPa · √m to 6.59 ± 0.23 MPa · √m fracture toughness values, respectively. The fracture toughness of the ZTA–MgO–CeO2 compositions is higher due to crack bridging and crack deflection. The toughening mechanisms of crack deflection and bridging hinder crack propagation since more energy is required to make the crack propagate. However, the formation of CeAl11O18 phase was observed; this consequently decreases the hardness and fracture toughness of the ZTA–MgO–CeO2 compositions.
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| first_indexed | 2025-11-14T15:37:24Z |
| format | Article |
| id | iium-33035 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T15:37:24Z |
| publishDate | 2013 |
| publisher | Elsevier |
| recordtype | eprints |
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| spelling | iium-330352014-04-22T08:12:59Z http://irep.iium.edu.my/33035/ The relationship between microstructure and fracture toughness of zirconia toughened alumina (ZTA) added with MgO and CeO2 Rejab, Nik Akmar Ahmad Azhar, Ahmad Zahirani Ratnam, Mani Maran Ahmad, Zainal Arifin TA401 Materials of engineering and construction The aim of this research is to investigate the mode of crack propagation in zirconia toughened alumina (ZTA) added with MgO and CeO2, respectively. The mode of crack refers to the toughening mechanism of the materials. Different ZTA compositions containing MgO and CeO2 as sintering additives were prepared using pressureless sintering at 1600 °C. Each sample was subjected to Vickers indentation with 294 N load and the cracks that propagated were observed with SEM. The ZTA with an addition of 0.7 wt.% MgO showed a crack deflection with a fracture toughness value of 6.19 ± 0.26 MPa · √m. On the other hand, the ZTA with CeO2 addition of 0.5 to 7 wt.% showed both crack bridging and deflection, and produced 5.78 ± 0.16 MPa · √m to 6.59 ± 0.23 MPa · √m fracture toughness values, respectively. The fracture toughness of the ZTA–MgO–CeO2 compositions is higher due to crack bridging and crack deflection. The toughening mechanisms of crack deflection and bridging hinder crack propagation since more energy is required to make the crack propagate. However, the formation of CeAl11O18 phase was observed; this consequently decreases the hardness and fracture toughness of the ZTA–MgO–CeO2 compositions. Elsevier 2013-11 Article PeerReviewed application/pdf en http://irep.iium.edu.my/33035/1/Nik2.pdf Rejab, Nik Akmar and Ahmad Azhar, Ahmad Zahirani and Ratnam, Mani Maran and Ahmad, Zainal Arifin (2013) The relationship between microstructure and fracture toughness of zirconia toughened alumina (ZTA) added with MgO and CeO2. International Journal of Refractory Metals and Hard Materials, 41. pp. 522-530. ISSN 0263-4368 http://www.sciencedirect.com/science/article/pii/S0263436813001443 http://dx.doi.org/10.1016/j.ijrmhm.2013.07.002 |
| spellingShingle | TA401 Materials of engineering and construction Rejab, Nik Akmar Ahmad Azhar, Ahmad Zahirani Ratnam, Mani Maran Ahmad, Zainal Arifin The relationship between microstructure and fracture toughness of zirconia toughened alumina (ZTA) added with MgO and CeO2 |
| title | The relationship between microstructure and fracture toughness of zirconia toughened alumina (ZTA) added with MgO and CeO2 |
| title_full | The relationship between microstructure and fracture toughness of zirconia toughened alumina (ZTA) added with MgO and CeO2 |
| title_fullStr | The relationship between microstructure and fracture toughness of zirconia toughened alumina (ZTA) added with MgO and CeO2 |
| title_full_unstemmed | The relationship between microstructure and fracture toughness of zirconia toughened alumina (ZTA) added with MgO and CeO2 |
| title_short | The relationship between microstructure and fracture toughness of zirconia toughened alumina (ZTA) added with MgO and CeO2 |
| title_sort | relationship between microstructure and fracture toughness of zirconia toughened alumina (zta) added with mgo and ceo2 |
| topic | TA401 Materials of engineering and construction |
| url | http://irep.iium.edu.my/33035/ http://irep.iium.edu.my/33035/ http://irep.iium.edu.my/33035/ http://irep.iium.edu.my/33035/1/Nik2.pdf |