An alloy is a metallic solution or compound that is formed by the combination of multiple chemical elements of which at least one is a metal. Because an alloy contains a mixture of elements, you can categorize it as a solid solution or compound based on its final form. 

Metals are, in general, insoluble in organic solvents, such as water, alcohol, ether, and benzene. A metal can dissolve in another metal in molten state, forming a homogeneous liquid mixture that cools to solidify to a solid mixture of alloys. Most metals can be mixed in all proportions. Mixing multiple metals or nonmetals can form homogeneous or heterogeneous alloys. Alloys are homogeneous in liquid state but can be either homogeneous or heterogeneous in solid state.

Alloys have been used in industries for a long time. Few widely used applications are:

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  Stainless Steel is used in wire and ribbon forms for applications, such as screening, staple, belt, cable, weld, metalizing, catheter, and suture wire.

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  Alloys of Gold and Silver are used in the preparation of jewelry. White Gold, which is an alloy of Gold, Silver, Palladium, and Nickel is used as cheap alternative of Platinum. A wide selection of alloys is used in welding applications by numerous industries.

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  Some alloys function as corrosion-resistant materials and are used in moisture rich-environments.

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  High temperature alloys have been used for many aerospace and petrochemical applications. In addition, they have been used for welding wire, where elevated temperatures and harsh environments are routinely encountered. These alloys have been used in applications where corrosion resistance and high strength must be maintained at elevated temperatures.

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  Magnetic alloys are used for magnetic cores and dry reed switches. Quality control measures include magnetic testing to maintain consistently high standards of uniformity and performance.

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  Alloys are also used to produce internal and external leads.

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  Nickel-Chromium, Nickel-Chromium-Iron, and Iron-Chromium-Aluminum alloys have been used for high-temperature heating elements.

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  Some alloys are used as resistance elements to control or measure electric current. Applications have included wire-wound resistors, rheostats, potentiometers, and shunts.

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  Thermocouple alloys have found a wide-range of use in temperature sensing and control.

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  Alloys are also used as thermostat metals, radio and electronic devices, precision devises in aircraft controls, telecommunications, automotive applications, and so on.

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