MMC is mainly used in the automotive industry with particle reinforced and short fiber reinforced aluminum matrix composites. MMC has the characteristics of high specific strength, specific stiffness, good wear resistance, good thermal conductivity and low coefficient of thermal expansion. It has been widely used in industry. The MMC used in the automotive industry is reinforced on aluminum or magnesium matrix with powder or detrital fibers. MMC is made on automobile brake disc, brake drum, brake pincer, piston, drive shaft and tire bolt.

Aluminum based composites are generally used in aluminum based composites at present. The commonly used filling enhancers are ceramic fibers and particles. Compared with aluminum alloy, it has the advantages of light weight, high specific strength, high modulus of elasticity, good heat resistance and wear resistance. It is an ideal material for automotive lightweight.

The piston is one of the main parts of the engine. It works at high temperature and high pressure, so it is very important to choose the suitable piston material. At present, the composite material used in the piston is made up of low density metal and reinforced ceramic fiber, which is mainly used for high performance aluminum pistons. In recent years, fiber reinforced metal (FRM) has been developed, and aluminum alloy base FRM has high tensile strength and wear-resistant and heat-resistant properties. Fiber reinforced light metals can be used in areas where light alloys can not meet strength and wear resistance. It is a promising material. On this basis, the aluminum piston reinforced by alumina fiber reinforced piston crown and piston made of magnesium alloy reinforced by alumina increased the application of piston on the piston.