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Aluminum is the mostly used in form of alloys of pure aluminium in combination with other elements in order  to improve the mechanical properties of the metal, especially to increase strength and corrosion resistance. 

The aluminium alloys in UAL are mostly of the 1000, 3000 and 5000 series

Alloy elements to achieve certain properties on the final product:

Fe      increase the strength
Si       in combination with Mg for higher strength
Cu     increase the mechanical properties, reduces corrosion-resistance
Mn     increase the mechanical properties, changes deep-drawing quality
Mg     high strength after cold forming
Cr      more strength in combination with elements like Cu, Mn, Mg
Ti       higher strength
Zn      increases corrosion-resistance