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    aluminum alloy

    Author : Sam Smith

    As we talked before aluminum is a metallic element with a silvery white appearance that is found in abundance in earth’s crust. Though making up almost 8% of the earth’s crust,it does not occur naturally as a free metal as it is too reactive chemically.

    Alloy on the other hand is a substance that is a solid made up of two or more elements. It is not a compound as elements do not react to form the compound but rather remain separately within it.

    As such, aluminum alloy always has different physical properties than the elements it is made up of. In its pure form, aluminum is not considered useful as a structural material as it has low tensile strength. However, when mixed with other elements, the alloys of aluminum show marked improvement in mechanical properties.

    The main alloying elements in the AA system are as follows:
    1xx.x series are minimum 99% aluminium
    2xx.x series copper
    3xx.x series silicon, copper and/or magnesium
    4xx.x series silicon
    5xx.x series magnesium
    7xx.x series zinc
    8xx.x series lithium
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