Elastic modulus of large-particle composites

The elastic modulus of a composite containing large particles depends on the volume fraction of the 

The cemented carbides are large-particle composites. These materials are used as cutting tools to machine hard steels. The first cemented carbide made was formed of tungsten carbide particles embedded in a matrix of cobalt metal. The hard carbide cuts the steel but is brittle. The toughness comes from the cobalt matrix. 

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