An aluminum alloy is a composition consisting mainly of aluminum to which other elements have been added. The alloy is made by mixing together the elements when aluminum is molten (liquid), which cools to form a homogeneous solid solution. The other elements may make up as much as 15 percent of the alloy by mass. Zinc alloy refers to any metal composed of two or more elements in which at least one is zinc. Zinc is the 24 th most abundant naturally occurring element. The resulting metal alloy is uniform in nature and possesses increased physical, chemical, electrical and corrosion resistant properties. Stamping, also called pressing, involves placing flat sheet metal, in either coil or blank form, into a stamping press. In the press, a tool and die surface form the metal into the desired shape. Punching, blanking, bending, coining, embossing, and flanging are all stamping techniques used to shape the metal.http://www.yatfeimould.com/injection-molding/metal-injection-molding/