Novel metal matrix composites have been produced by cast production route. TiC and WC ceramic reinforcing particles have been successfully introduced into Al 6060, Al 319, Al 356, Al-7Si-5Mg, Al-20Cu and Al 2007 alloys. Refined grain structure and various intermetallic phase formation have been observed. Particle-melt and particle-solidification front interactions, solidification sequence and particle-matrix interfacial characteristics have been examined by means of metallography, SEM examination and EDX analysis. Particle distribution, intermetallic phase formation and location and grain structure are discussed in terms of ceramic-melt wetting characteristics, alloying element interfacial segregation and particle-solidification front thermal behaviour.