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Metal matrices materials are known for their high stiffness, toughness, strength and their ability to withstand elevated temperature in corrosive environment. Most of the metals and alloys can be used as matrices, however, they often require compatible reinforcement materials which are stable over a range of temperature and also non-reactive [11]. Light metals form the matrix for temperature application and the reinforcements, besides the aforementioned reasons are characterized by high module. The high strength in metallic matrix materials can be achieved by utilizing high modulus reinforcements. In such composites materials, the strength-to-weight ratios can be higher than most alloys. The physico-chemical properties of the matrix materials determine the service temperature of the composites and so the choice of reinforcements becomes more important in application demanding higher melting temperature [12].

Figure 2.4 Classification of thermosets.