Aluminium alloys are
alloys in which
aluminium (Al) is the predominant metal. The typical alloying elements are
copper,
magnesium,
manganese,
silicon, and
zinc. There are two principal classifications, namely
casting alloys and wrought alloys, both of which are further subdivided into the categories
heat-treatable and non-heat-treatable. About 85% of aluminium is used for wrought products, for example rolled plate, foils and
extrusions. Cast aluminium alloys yield cost effective products due to the low melting point, although they generally have lower
tensile strengths
than wrought alloys. The most important cast aluminium alloy system is
Al-Si, where the high levels of silicon (4.0% to 13%) contribute to give
good casting characteristics. Aluminium alloys are widely used in
engineering structures and components where light weight or corrosion
resistance is required.
[1]
These alloys are used for cycling frames and components
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