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An alloy is a mixture of metals or a mixture of a metal and another element.Alloys are defined by metallic bonding character.he term alloy is used to describe a mixture of atoms in which the primary constituent is a metal. The primary metal is called the base, the matrix, or the solvent. The secondary constituents are often called solutes.
Aluminium is usually alloyed â it is used as pure metal only when corrosion resistance and/or workability is more important than strength or hardness. Aluminium-based alloys abruptly increase their strength characteristics with small additions of scandium, as well as zirconium and hafnium. Aluminium is used to make food containers, because of its resistance to corrosion. 2  Aluminium with magnesium [alloy] is used to make body of aircraft. 3  Aluminium with other metals, used to make railway tracks. 4  Aluminium is used to make cooking utensils, because it is resistant to corrosion, and light-weight.