An<unk>  is a solid solution or homogeneous mixture of two or more elements, at least one of which is a metal, which itself has metallic properties. It usually has different properties from those of its component elements.<unk> ing one metal with others often enhances its properties.
For instance, steel is stronger than iron, its primary element. The physical properties, such as density, reactivity, Young's modulus, and electrical and thermal conductivity, of an<unk>  may not differ greatly from those of its elements, but engineering properties, such as tensile strength and shear strength may be substantially different from those of the constituent materials. This is sometimes due to the sizes of the atoms in the<unk> , since larger atoms exert a compressive force on neighboring atoms, and smaller atoms exert a tensile force on their neighbors, helping the<unk>  resist deformation.<unk> s may exhibit marked differences in behavior even when small amounts of one element occur.  For example, impurities in semi-conducting ferromagnetic<unk> s lead to different properties, as first predicted by White, Hogan, Suhl, Tian Abrie and Nakamura.
Some<unk> s are made by melting and mixing two or more metals. Brass is an<unk>  made from copper and zinc. Bronze, used for statues, ornaments and church bells, is an<unk>  of tin and copper.
Unlike pure metals, most<unk> s do not have a single melting point. Instead, they have a melting range in which the material is a mixture of solid and liquid phases. The temperature at which melting begins is called the solidus and the temperature when melting is complete is called the liquidus. However, for most<unk> s there is a particular proportion of constituents which give them a single melting point or (rarely) two.  This is called the<unk> 's eutectic mixture.
Alloy
Wonder 
Crista
Plastic
Sultiame
United States Adopted Name
Chilblain
Chigger