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Single-phase Y4Al2O9 (YAM) powders were synthesized via solid-state reaction starting from nano-sized Al2O3 and Y2O3. Fully dense (99.5%) bulk YAM ceramics were consolidated by spark plasma sintering (SPS) at 1800 ℃. We demonstrated the excellent damage tolerance and good machinability of YAM ceramics. Such properties are attributed to the easy slipping along the weakly bonded crystallographic planes, resulting in multiple energy dissipation mechanisms such as transgranular fracture, shear slipping and localized grain crushing.


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Spark plasma sintering of damage tolerant and machinable YAM ceramics

Show Author's information Qian WANGa,bSalvatore GRASSOcChunfeng HUa,*( )Haibin ZHANGdShu CAIb,*( )Yoshio SAKKAeQing HUANGa,*( )
Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences (CAS), Ningbo 315201, China
School of Engineering & Materials Science and Nanoforce Technology Ltd., Queen Mary University of London, Mile End Road, London E1 4NS, UK
China Academy of Engineering Physics, Mianyang 621900, China
Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, China
National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan

Abstract

Single-phase Y4Al2O9 (YAM) powders were synthesized via solid-state reaction starting from nano-sized Al2O3 and Y2O3. Fully dense (99.5%) bulk YAM ceramics were consolidated by spark plasma sintering (SPS) at 1800 ℃. We demonstrated the excellent damage tolerance and good machinability of YAM ceramics. Such properties are attributed to the easy slipping along the weakly bonded crystallographic planes, resulting in multiple energy dissipation mechanisms such as transgranular fracture, shear slipping and localized grain crushing.

Keywords:

ceramic, synthesis, microstructure, property, damage tolerance
Received: 03 March 2013 Revised: 03 April 2013 Accepted: 04 April 2013 Published: 04 June 2013 Issue date: June 2013
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Publication history

Received: 03 March 2013
Revised: 03 April 2013
Accepted: 04 April 2013
Published: 04 June 2013
Issue date: June 2013

Copyright

© The author(s) 2013

Acknowledgements

The present work was supported by “Chunlei Program” in Ningbo, “Hundred Talents Program” of the Chinese Academy of Sciences (No. KJCX2-EW-H06), National Natural Science Foundation of China (No. 51172248/E020301), and National Natural Science Foundation of China (Nos. 50772072 and 51072129).

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