We can find differential of alloy and composite. MMC is came from 2 differential of metal, one from it aren't melting same as producing alloy. but there are might produce new reaction. ex: C with Fe, the name is carbon steel. the nano-composite just too, but the particle aren't big, and the size is nano. the differential of it came from the coefficient electric, the composite aren't count without experiment. but what is differential of alloy, MMC and metal nano-composite, when it see from structure composition and phase?