8xxx: other elements which are not covered by other series.The different families of alloys and the major alloying elements are: The aluminium alloys are divided into 9 families (Al1xxx to Al9xxx). Aluminium alloy compositions are registered with The Aluminum Association. But when alloyed, aluminium alloys are heat treatable, which significantly changes theri mechanical properties.Īluminium alloys are based on aluminium, in which the main alloying elements are Cu, Mn, Si, Mg, Mg+Si, Zn. Aluminium of commercial purity (99-99.6%) becomes harder and stronger due to the presence of impurities, especially of Si and Fe. High purity aluminium is a soft material with the ultimate strength of approximately 10 MPa, which limits its usability in industrial applications.
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