Abstract
The term ‘two-phase materials’ embraces an extremely broad spectrum which includes many naturally occurring minerals and rocks, materials of organic origin, and man-made aggregates of metallic, ceramic, glassy, and polymeric materials. This review is restricted to the materials relevant to physical metallurgy, i.e. metals, metal compounds, and ionic solids. In general, it is concerned with systems in which the second-phase component is in the form of dispersed particles. A lower limit of particle size of the order of one micron has been set, to avoid a discussion of precipitation-hardening. Fibre-strengthened materials and other synthetic products, such as laminated structures, have not been considered.