Engineering Materials
Duralumin contains

3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
5 to 6% tin, 2 to 3% copper and rest aluminium
4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

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Engineering Materials
Cobalt in steel

Improves wear resistance, cutting ability and toughness
Improves cutting ability and reduce hardenability
Gives ductility, toughness, tensile strength and anti corrosion property
Refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties

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