Crack growth resistance (R-curve) behaviour and thermo-physical properties of $Al_2O_3$ particle-reinforced AlN/Al matrix composites

Boddapati, Srinivasa Rao and Rodel, Jurgen and Jayaram, Vikram (2007) Crack growth resistance (R-curve) behaviour and thermo-physical properties of $Al_2O_3$ particle-reinforced AlN/Al matrix composites. In: Composites Part A: Applied Science and Manufacturing, 38 (3). pp. 1038-1050.

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Abstract

Crack growth resistance behaviour and thermo-physical properties of $Al_2O_3$ particle-reinforced AlN/Al matrix composites have been studied as a function of AlN volume fraction as well as $Al_2O_3$ particle size. The fracture toughness of the composites decreased with increase in vol% AlN and decrease in $Al_2O_3$ 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:	Journal Article
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	A.Particle-reinforcement;B.Fracture;B.Thermal properties; Liquid metal infiltration
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	09 Apr 2007
Last Modified:	19 Sep 2010 04:36
URI:	http://eprints.iisc.ernet.in/id/eprint/10554

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