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Strength and fracture toughness of a aluminum/alumina composites with interpenetrating networks

Prielipp, Helge and Knechtel, Mathias and Claussen, Nils and Streiffer, S. K. and Müllejans, H. and Rühle, M. and Rödel, Jürgen (1995):
Strength and fracture toughness of a aluminum/alumina composites with interpenetrating networks.
In: Materials science and engineering. A, pp. 19-30, 197, (1), [Online-Edition: http://dx.doi.org/10.1016/0921-5093(94)09771-2],
[Article]

Abstract

The mechanical properties of metal reinforced ceramics, especially Al/Al2O3 composites with interpenetrating networks, are described. Key parameters to tailor the characteristics of these materials are the ligament diameter and volume fraction of ductile reinforcement. Fracture strength and fracture toughness data are given as a function of both variables and are compared with the corresponding values for the porous preforms. A simple model accounts for the influence of metal volume and metal ligament diameter on the plateau toughness of the composites. The increase in fracture strength from the porous preform to the composite is found to be much larger than the gain which can be predicted from the increase in fracture toughness alone. A discussion of fracture strength in these composites therefore must include at least two issues, crack propagation through the matrix as well as crack initiation at metal filled pores.

Item Type: Article
Erschienen: 1995
Creators: Prielipp, Helge and Knechtel, Mathias and Claussen, Nils and Streiffer, S. K. and Müllejans, H. and Rühle, M. and Rödel, Jürgen
Title: Strength and fracture toughness of a aluminum/alumina composites with interpenetrating networks
Language: English
Abstract:

The mechanical properties of metal reinforced ceramics, especially Al/Al2O3 composites with interpenetrating networks, are described. Key parameters to tailor the characteristics of these materials are the ligament diameter and volume fraction of ductile reinforcement. Fracture strength and fracture toughness data are given as a function of both variables and are compared with the corresponding values for the porous preforms. A simple model accounts for the influence of metal volume and metal ligament diameter on the plateau toughness of the composites. The increase in fracture strength from the porous preform to the composite is found to be much larger than the gain which can be predicted from the increase in fracture toughness alone. A discussion of fracture strength in these composites therefore must include at least two issues, crack propagation through the matrix as well as crack initiation at metal filled pores.

Journal or Publication Title: Materials science and engineering. A
Volume: 197
Number: 1
Uncontrolled Keywords: BRITTLE-MATRIX COMPOSITES; DUCTILE REINFORCEMENTS; CERAMIC COMPOSITES; CRACK DEFLECTION; RESISTANCE
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Fachbereich Materialwissenschaft (1999 aufgegangen in 11 Fachbereich Material- und Geowissenschaften)
Date Deposited: 19 Nov 2008 15:58
Official URL: http://dx.doi.org/10.1016/0921-5093(94)09771-2
Identification Number: doi:10.1016/0921-5093(94)09771-2
License: [undefiniert]
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