The melt of light metals does not wet the reinforcing material. Therefore the two components have to be forced together e.g. by pressure infiltration of molten metal into reinforcement preforms, or by powder metallurgical compaction in the solid state, or by stirring discontinuous reinforcement into the melt . The reactivity of the melt with certain atmospheres in the preform can stimulate pressureless infiltration due to the chemical activity
pressure infiltration of molten metal into reinforcement preforms