*3.1.1 Metal matrix composite (MMC)*

A metal matrix composite is a combination of two or more constituents, of which at least one should be a metal, and the other may be a metal, ceramic or organic

**Figure 3.** *Classifications of composite materials.*

**Figure 4.**

*Classification of composite cutting tool.*

compound [14]. Various matrix used in MMC are aluminum, copper, magnesium, and iron. Oxides, carbides, and solid lubricants such as graphite and MoS2 are the common reinforcements used in MMCs.
