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Crack growth resistance (R-curve) behaviour and thermo-physical properties of Al2O3 particle-reinforced AlN/Al matrix composites

Boddapati, Srinivasa Rao and Rödel, Jürgen and Jayaram, Vikram (2007):
Crack growth resistance (R-curve) behaviour and thermo-physical properties of Al2O3 particle-reinforced AlN/Al matrix composites.
In: Composites Part A: Applied Science and Manufacturing, pp. 1038-1050, 38, (3), ISSN 1359835X,
[Online-Edition: http://dx.doi.org/10.1016/j.compositesa.2006.06.015],
[Article]

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Abstract

Crack growth resistance behaviour and thermo-physical properties of Al2O3 particle-reinforced AlN/Al matrix composites have been studied as a function of AlN volume fraction as well as Al2O3 particle size. The fracture toughness of the composites decreased with increase in vol% AlN and decrease in Al2O3 particle size. All the composites exhibited R-curve behaviour which has been attributed to crack bridging by the intact metal ligaments behind the crack tip. The Young’s modulus of the composites increased with the vol% of AlN whereas the thermal diffusivity and coefficient of thermal expansion followed a reverse trend. The composites exhibited hysteresis in thermal expansion as a function of temperature and the hysteresis decreased with decrease in metal content of the composite.

Item Type: Article
Erschienen: 2007
Creators: Boddapati, Srinivasa Rao and Rödel, Jürgen and Jayaram, Vikram
Title: Crack growth resistance (R-curve) behaviour and thermo-physical properties of Al2O3 particle-reinforced AlN/Al matrix composites
Language: English
Abstract:

Crack growth resistance behaviour and thermo-physical properties of Al2O3 particle-reinforced AlN/Al matrix composites have been studied as a function of AlN volume fraction as well as Al2O3 particle size. The fracture toughness of the composites decreased with increase in vol% AlN and decrease in Al2O3 particle size. All the composites exhibited R-curve behaviour which has been attributed to crack bridging by the intact metal ligaments behind the crack tip. The Young’s modulus of the composites increased with the vol% of AlN whereas the thermal diffusivity and coefficient of thermal expansion followed a reverse trend. The composites exhibited hysteresis in thermal expansion as a function of temperature and the hysteresis decreased with decrease in metal content of the composite.

Journal or Publication Title: Composites Part A: Applied Science and Manufacturing
Volume: 38
Number: 3
Uncontrolled Keywords: Particle-reinforcement; Fracture; Thermal properties; Liquid metal infiltration
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: 15 Jun 2011 08:18
Official URL: http://dx.doi.org/10.1016/j.compositesa.2006.06.015
Identification Number: doi:10.1016/j.compositesa.2006.06.015
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