Microstructural Inhomogeneity and the Strength of Particulate Metal Matrix Composites

The clustering of particles in metal matrix composite systems is known to affect damage and fracture behaviour. Recent experimental work suggests that it also affects the plasticity at small strains. In this paper we review the existing experimental and numerical modelling work in this area. We present a model which addresses the influence of clustering on initial yield and strain hardening. Finally, we will describe the development of model PMMC microstructures obtained via a novel powder metallurgy technique possessing controlled distributions of the hard second phase. These materials will be used to investigate the effect of inhomogeneity on mechanical properties.