Brass – Brass is an alloy with bright yellow appearance. The constituent elements of brass are copper and zinc. Brass is an example of substitutional alloy i.e. the atoms of the component elements; copper and zinc may replace each other. The brass also contains small proportions of other elements like silicon, lead, aluminium, phosphorous, etc. Due to its low melting point, durability, electrical and thermal conductivity, brass is used for various purposes.Bronze – Bronze is also an alloy of copper and tin. It consists of 12 - 12.5Amalgam – Amalgam is an alloy of mercury with other metals like tin, silver, copper, etc. Amalgam is mainly used for dental fillings and making dyes.Steel – Steel is an alloy comprising iron, carbon and magnesium. The carbon content is about 2Thus, steel is an alloy which is made up of iron, carbon and magnesium as well as small traces of oxygen, sulphur, silicon and phosphorus. So, steel is an alloy which also consists of non-metal.