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

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

The mechanical properties of metal reinforced ceramics, especially Al/Al 2O 3 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 fractu...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 197; no. 1; pp. 19 - 30
Main Authors: Prielipp, Helge, Knechtel, Mathias, Claussen, Nils, Streiffer, S.K., Müllejans, H., Rühle, M., Rödel, Jürgen
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 30-06-1995
Elsevier
Subjects:
Al/Al 2O 3 composites
Applied sciences
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure
Fatigue, embrittlement, and fracture
Fracture
Interpenetrating networks
Materials science
Metals. Metallurgy
Physics
Treatment of materials and its effects on microstructure and properties
Interpenetrating networks
Fracture
Al/Al 2O 3 composites
Aluminium base alloys
Ruptures
Volume fraction
Mechanical properties
Ceramics
Experimental study
Dispersion strengthened metal
Crack propagation
Fracture toughness
Composite materials
SEM
Rupture strength
Alumina
TEM
Strength
Aluminium oxides
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Description
Summary:The mechanical properties of metal reinforced ceramics, especially Al/Al 2O 3 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.
ISSN:0921-5093
1873-4936
DOI:10.1016/0921-5093(94)09771-2