Particle reinforced metal matrix composites (PRMMCs) have emerged as an important class of materials for aerospace and some other applications due to their superior properties such as higher strength to weight ratio, high elastic modulus and wear resistance. Typically, PRMMCs can be prepared in two ways, which are called ex situ and in situ process respectively. In ex situ process, the reinforcements are synthesized separately and added in the matrix by a secondary process such as stir casting. The segregation of reinforcement particles and poor adhesion at the interface are normally observed in ex situ composites. On the contrary, the in situ composite involves synthesis of reinforcing phases directly within the matrix, which leads to a better adhesion at interfaces and hence improves mechanical properties.
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