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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.
Brass, for example, is a substitution alloy based on copper in which atoms of zinc replace 10â35 percent of the atoms that would normally be in copper. Brass works as an alloy because copper and zinc are close to one another in the periodic table and have atoms of roughly similar size.nterstitial alloys. Alloys can also form if the alloying agent or agents have atoms that are very much smaller than those of the main metal. In that case, the agent atoms slip in between the main metal atoms (in the gaps or interstices), giving what's called an interstitial alloy.