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Alloys are special sorts of mixtures, usually between two or more metals (for example Copper and Tin, making brass) although they may be formed between a metal and a non-metal element (such as Iron and Carbon, making steel).
The substance formed (the alloy) has different physical and chemical properties from each of its components.
The difference between alloys and ordinary mixtures is that in alloys, the different elements are mixed completely at random, resulting in a uniform distribution, one with another, throughout the material. In fact, another way of thinking of an alloy is as a solution of two solids, one within the other.
Alloys are usually formed by melting the components together.
Alloy wheels on cars are made from alloys of Aluminium with Silicon and other elements to add strength to the lightness and attractive silvery appearance of the Aluminium.
Anne Evans
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