Aluminium is the most abundant metal in the world. It makes up 8% of the solid portion of the earth crust. Every country processes large supplies of aluminium containing material, but process for obtaining metallic aluminium from most of these compound are not yet economical. The consumption of aluminium is increasing the main avenues of distribution. The unusual combination of lightness and strength makes aluminium application for many uses that other metals cannot fill. Aluminium is commonly alloyed with other metals, such as copper, magnesium, zinc, silicon, chromium and manganese and its usefulness is increased. Metallic aluminium or aluminium alloys, particularly with magnesium, are employed in structures for aircraft, automobiles, trucks and railways, cars and for cast and forged structural parts.
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