Stirring an added ceramic particulate in liquid or semisolid alloy followed by a gravitation or pressure die casting of the product may be a good way to produce MMCs with improved strength and wear resistance. The problem which should be overcome throughout this production route is a particulate primary (in dry state) and secondary (when it comes in a contact with a liquid metal) agglomeration.

The stirring causes a uniform dispersion of the reinforcing particulates within the Al matrix for effective load transfer between the matrix and the reinforcements, thus improving the load bearing capacity of the MMCs

stir casting process was generally adopted to develop composites which improove wettability and uniform dispersion of particulates in matrix which enhance the mechanical properties of composites

Vortex stir casting technique is based on the turbulence principle. The second phase particulate and the matrix phase wettability plays a vital role in bonding and uniform distribution. Process parameters like stirring speed, pouring temperature of the slurry mixture, pouring speed, wettability, type of mold used decides the quality of the metal matrix composite produced.

As much as stirring will facilitate even dispersion of the particulate in the metal melt, there is a high possibility of having agglomeration of the reinforcing particles in the melt (due to fine particle sizes that will support stickiness/cohesion once wetted).

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