Mr.  Chintan

I thought in order to suit the best metal matrix composite (MMC) using for an Electrical discharge machining (EDM) research are the mixing materials of copper powder and Al2O3 powder.

Best wishes  

Any MMC which has high electrical conductivity is suitable for EDM

EDM is best suited for machining hard materials like most of the die steels which are conductive....EDM can also be explored for MMC which has been reinforced with a hard phase particle., that would rather be difficult to machine using the conventional means with greater accuracy.

I would go by any of the reinforcements suggested by Mr. Amin Ezazi dispersed in Mg, Al, Cu or others which have some practical application (or find a possible application) after your EDM. These reinforcements can be easily ordered from many websites (which indicate the properties and price of the same) and the easiest method to prepare them would be by stir casting. But be careful with the agglomeration problems associated with it.

Hope I threw some light for your question! All the best!

Thank you all for reply but what about the availability of the particular type of MMC or preparation method ?

Chaitan,

There are many method to fabricate MMC's. 

e.g. 

1. Solid state methods like Powder blending and consolidation, Foil diffusion bonding

2. Liquid state methods like Electroplating and electroforming, Stir casting

3. Semi-solid state methods

4. Vapor deposition

However each method has its own pros and cons

I thing you can easily use Stir casting as it is easy and low cost.