**3.9 Selection of reinforcement**

Selection of reinforcement plays a crucial role as improving the desired properties of final material. As reinforcement (discontinuous or continuous) is embedded in the matrix, they share the load and transfer strength to the matrix. Discontinues metal matrix composites are mostly isotropic in nature and also cost effective. The following reinforcements are selected for this work.

Graphene. Titanium and Titanium dioxide.

Most widely used and recommended reinforcement were titanium carbide, boron carbide, MWCNT for melting metallurgical methods. Yet the studies discloses the other types of reinforcement like titanium dioxide and graphene are usually used for coating purpose to enhance the corrosion resistance property on magnesium alloy and results obtained were positive. But titanium dioxide and graphene used as reinforcement in magnesium matrix hybrid composites are limited and yet to be explored. Similarly, titanium and graphene as reinforcements embedded in magnesium matrix are yet to be explored.
