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Toughening of Brittle Materials by Dislocation Cells

Published online by Cambridge University Press:  02 July 2020

H. Saka ,
W.-J. Moon ,
S. Horiuchi  and
S. Uchimura
H. Saka
Affiliation:
Department of Quantum Engineering, Nagoya University. , Nagoya , 464-8603, Japan
W.-J. Moon
Affiliation:
Department of Quantum Engineering, Nagoya University. , Nagoya , 464-8603, Japan
S. Horiuchi
Affiliation:
Department of Quantum Engineering, Nagoya University. , Nagoya , 464-8603, Japan
S. Uchimura
Affiliation:
Sinto V-Cerax Ltd. Toyokawa, Aichi , 422-8505, Japan
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Abstract

Many attempts have been made to improve the fracture toughness of brittle materials such as ceramics. Most of the methods developed so far make use of metallurgical processes, for example, phase transformation, refining of grains, formation of composite materials. However, these methods can not be applied universally to brittle materials which do not have such a useful metallurgical processes.

Moon and Saka (1) recently showed that the fracture toughness Klc of a YAG single crystal the sub-surface of which is damaged by micro-Vickers indentation at room temperature, followed by annealing at high temperatures is improved by a factor 2 from 1.13 to 2.26MPam1/2. The fracture toughness Klc was evaluated by measuring the length of cracks which initiate at the corner of Vickers indentation(2). Transmission electron microscopy of the subsurface reveals the healing of cracks introduced by room-temperature indentation and formation of dislocation cells. The thin foil specimens were prepared using a focused ion beam (FIB) technique(3).

Type
Novel Microscopy Assisted Ceramic Developments in Materials Scienceand Nanotechnology (Organized by P. Gai and J. Lee)
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 420 - 421
Copyright
Copyright © Microscopy Society of America 2001

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References

1) Moon, W.-J., and Saka, H., Phil.Mag.Lett.,2000,80,461.Google Scholar

2) Shetty, D.K., Rosenfield, A.R., and Duckworth, W.H., 1985,J.Am.Ceram.Soc.,68,C-282.CrossRefGoogle Scholar

3) Saka, H., and Nagoya, G.,1995,Phil.Mag.Lett.,72,251.CrossRefGoogle Scholar

4) Standard samples available from JFCC.Google Scholar