In pure iron, the atoms are all the same size and are arranged in regular layers. These layers can slide over each other easily, making the metal soft.
In an alloy, atoms of other elements are introduced, which have a different size. This distorts the regular arrangement of the layers.
As a result, the layers can no longer slide over each other easily, making the alloy harder and stronger than the pure metal.
**Pure Iron:** In a pure metal like iron, all the atoms are the same size. They are arranged in a regular, repeating pattern, forming layers. These layers can easily slide over one another when a force is applied, which makes the pure metal relatively soft and malleable.
**Alloys:** An alloy is a mixture of a metal with at least one other element (often another metal). For example, steel is an alloy of iron and carbon. The atoms of the other element(s) have a different size from the iron atoms. When introduced into the iron lattice, these different-sized atoms disrupt the regular arrangement of the layers. This distortion makes it much more difficult for the layers to slide past each other. As a result, a greater force is needed to deform the material, making the alloy harder and stronger than the pure metal.
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