Elastic properties of ceramic–metal particulate composites

In the present study, the experimental data on the elastic properties of several ceramic–metal systems, Al2O3–NiAl, SiC–Al, WC–Co and glass–W, are compiled and compared with several theoretical predictions. These theoretical predictions offer upper and lower bounds on the elastic constants. The elastic moduli of the ceramic–metal composites fall well within the Voigt–Reuss bounds and Hashin–Shtrikman (H–S) bounds. Though most the Poissonʹs ratio of ceramic–metal composites falls within the modified H–S bounds, the values of the composites with low second-phase concentration deviate from model predictions. The deviation shows strong dependence on the interconnectivity of each phase in the composites.