ALUMINIUM ALLOY

There are two main classes of aluminum alloy:

o Wrought alloys

o Cast alloys

Cast alloys;-has grain structure that is very coarse thus metal is brittle. Used in the construction of aircraft wheel castings,engine crankcases,gearboxes

Wrought alloys:-Most aircraft part are wrought alloys. Metals that are used as the principal alloying elements in wrought aluminum alloy :

1.silicon

2.magnesium

3.zinc

4. manganese

APPLICATION OF ALUMINIUM ALLOYS

CLADDING OF ALUMINIUM ALLOY

Sheet of aluminium alloy are clad with a thin layer of pure aluminium with 1% zinc on both sides.These layers are permanently welded to the base material in a rolling process at high temperature.Other than electroplated stock,clad material can be formed.The thickness of the clad layers is about 3 or 5% of the material thickness.An ink print on US sheet that reads Alclad indicates that such sheet is clad.