Electrochemical Properties of Al2O3-Fe/Si Composites Prepared by High-Energy Mechanical Milling

High Energy Mechanical Milling (HEMM) is a process in which a suitable powder charge (typically, a blend elemental) is repeatedly impacted by stainless steel balls in motion, these balls can roll down freely on the entire surface of the container that allows the impact forces acting on the powder particles during the collision events in order to transmit kinetic energy. The transferred energy is enough, so that the constituent powders are plastic deformed continuously, fractured and cold welded by means of grinding media to form a homogenous nanostructure material with the grain sizes ranging up to 100nm, the process can be performed at room temperature [1,2]. In general, the process HEMM can be defined as the mechanical breakdown of solids into smaller particles without changing the nature of their state of aggregation. This is one of the benefits that mechanical alloying is considered a rapidly developing technology with great industrial interest that can produce a wide range of dispersion strengthened, energetic nanocrystalline, ceramics, metal matrix composites, and other advanced materials [3-5].