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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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Main Authors: Rejab, Nik Akmar, Ahmad Azhar, Ahmad Zahirani, Ratnam, Mani Maran, Ahmad, Zainal Arifin
Format: Article
Language:English
Published: Elsevier 2013
Subjects:
TA401 Materials of engineering and construction
Online Access:http://irep.iium.edu.my/33035/1/Nik2.pdf
http://irep.iium.edu.my/33035/
http://www.sciencedirect.com/science/article/pii/S0263436813001443
http://dx.doi.org/10.1016/j.ijrmhm.2013.07.002
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spelling my.iium.irep.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 REM 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
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
topic TA401 Materials of engineering and construction
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
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.
format Article
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
title 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_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_sort relationship between microstructure and fracture toughness of zirconia toughened alumina (zta) added with mgo and ceo2
publisher Elsevier
publishDate 2013
url http://irep.iium.edu.my/33035/1/Nik2.pdf
http://irep.iium.edu.my/33035/
http://www.sciencedirect.com/science/article/pii/S0263436813001443
http://dx.doi.org/10.1016/j.ijrmhm.2013.07.002
_version_ 1643610350652751872
score 13.211869

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