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Purpose of Making Alloys. From Structure, Properties, and Applications of Various Alloys. Purpose of Making Alloys. Pure metals possess few important physical and metallic properties, such as melting point, boiling point, density, specific gravity, high malleability, ductility, and heat and electrical conductivity. These properties can be modified and enhanced by alloying it with some other metal or nonmetal, according to the need.
Alloys Added for Strength: The additions of alloying elements (other metals) to gold are used to increase the toughness and hardness of the metal. While almost any metal can be alloyed (melted) with gold, only certain metals will not dramatically change the color or make the metal brittle. For instance, the traditional 14 Karat gold contains fourteen parts of pure gold and ten parts of other metals such as silver, copper and nickel.