Applied Microscopy
- Volume 26 Issue 4
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- Pages.447-456
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- 1996
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- 2287-5123(pISSN)
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- 2287-4445(eISSN)
Fractographic Analysis of Ceramic Composites by Transmission Electron Microscopy using Surface Replication Technique
표면복제법을 이용한 세라믹 복합재료 파괴현상의 투과전자현미경 분석
- Jun, Hyeung-Woo (Division of Ceramics, Korea Institute of Science and Technology) ;
- Kim, Gyeung-Ho (Division of Ceramics, Korea Institute of Science and Technology) ;
- Kim, Byung-Ho (Department of Materials Science and Engineering, Korea University)
- Published : 1996.12.01
Abstract
Fracture surfaces of materials contain useful information ranging from crack path to the mechanism of fracture. Since limitation of electron transparency requires a sample in the form of thin foil for TEM observations, it is impossible to extract such information directly from the fracture surfaces. In this study, the method of surface replication from the ceramic fracture surface is employed to characterize the process of crack propagation in ceramic matrix composites using TEM analysis. The surface replica from the fracture surface in ceramic materials provides detailed surface morphology and more importantly, loosened particles on the fracture surface are collected. Electron diffraction and chemical composition analyses of these particles reveal crack path in the specimen. Furthermore, one can determine the mode of fracture by observing the fracture surface morphology from the image of replica. Two examples are given to illustrate the potential of the surface replication technique. In the first example, apparent toughness increase in
Keywords
- Fractographic analysis;
- Surface replication;
- $B_{4}C-Al$ composites;
- SiC-AlN composites;
- Fracture modes