Aluminium And Its Effects On The Earth 's Crust, And The Third Most Abundant Element

2195 Words Apr 7th, 2016 9 Pages
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CHAPTR 3
MATERIALS

3.1 ALUMINIUM

Aluminium is the most abundant metal in the Earth’s crust, and the third most abundant element, after oxygen and silicon. It makes up about 8% by weight of the Earth’s solid surface. The chief source of aluminium is bauxite ore. Its Atomic number is Aluminium is a soft, durable, lightweight, ductile and malleable metal with appearance ranging from silvery to dull grey, depending on the surface roughness. Aluminium is nonmagnetic and non-sparking. Aluminium has about one-third the density and stiffness of steel. It is easily machined, cast, drawn, and extruded. Corrosion resistance can be excellent due to a thin surface of Aluminium oxide that forms when the metal is exposed to air, effectively preventing further oxidation.

3.2 ALUMINIUM COMPOSITE

In recent years aluminium composites are widely used in automotive industries. This is particularly due to the real need to weight saving for more reduction of fuel consumption. The typical composite elements are copper, magnesium, manganese, silicon, and zinc. Surfaces of aluminium composite have a brilliant luster in dry environment due to the formation of a shielding layer of aluminium oxide. Aluminium composites of the 4xxx, 5xxx and 6xxx series,

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Containing major elemental additives of Mg and Si, are now being used to replace
Steel panels if various automobile industries.Due to such reasons, these composites were subject of severalscientific studies in the past few years.…

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