Content of dispersed phase is limited (usually not more than 30 vol.%).
Distribution of dispersed phase throughout the matrix is not perfectly homogeneous:
1. There are local clouds (clusters) of the dispersed particles (fibers);
2. There may be gravity segregation of the dispersed phase due to a difference in the densities of the dispersed and matrix phase.
The technology is relatively simple and low cost.
Distribution of dispersed phase may be improved if the matrix is in semi-solid condition.
The method using stirring metal composite materials in semi-solid state is called Rheocasting.
High viscosity of the semi-solid matrix material enables better mixing of the dispersed phase.