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In Situ Observations of Toughening Processes in Alumina Reinforced with Silicon Carbide Whiskers

Rödel, Jürgen and Fuller, Edwin R. and Lawn, Brian R. (1991):
In Situ Observations of Toughening Processes in Alumina Reinforced with Silicon Carbide Whiskers.
74, In: Journal of the American Ceramic Society, (12), pp. 3154-3157, ISSN 0002-7820, [Online-Edition: http://dx.doi.org/10.1111/j.1151-2916.1991.tb04319.x],
[Article]

Abstract

An in situ study is made of crack interfaces in composites of alumina reinforced with silicon carbide whiskers. Both qualitative observations of the whisker-bridging micro-mechanisms and quantitative measurements of the crack profile are made to assess the specific role of the whiskers on the toughness curve (T-curve or R-curve). At small crackwall separations the whiskers act as elastic restraints to the point of rupture. In some cases the whiskers remain in frictional contact with the alumina matrix over large pullout distances (more than 1 μm) corresponding to a bridging zone approaching 1 mm. The results are discussed in relation to existing models of whisker reinforcement and published long-crack T-curve data.

Item Type: Article
Erschienen: 1991
Creators: Rödel, Jürgen and Fuller, Edwin R. and Lawn, Brian R.
Title: In Situ Observations of Toughening Processes in Alumina Reinforced with Silicon Carbide Whiskers
Language: English
Abstract:

An in situ study is made of crack interfaces in composites of alumina reinforced with silicon carbide whiskers. Both qualitative observations of the whisker-bridging micro-mechanisms and quantitative measurements of the crack profile are made to assess the specific role of the whiskers on the toughness curve (T-curve or R-curve). At small crackwall separations the whiskers act as elastic restraints to the point of rupture. In some cases the whiskers remain in frictional contact with the alumina matrix over large pullout distances (more than 1 μm) corresponding to a bridging zone approaching 1 mm. The results are discussed in relation to existing models of whisker reinforcement and published long-crack T-curve data.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 74
Number: 12
Uncontrolled Keywords: bridging; composites; cracks; pullout; toughness
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 13 Jun 2012 13:44
Official URL: http://dx.doi.org/10.1111/j.1151-2916.1991.tb04319.x
Identification Number: doi:10.1111/j.1151-2916.1991.tb04319.x
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