Engineering Materials
Addition of silicon to aluminium results in

One of the best known age and precipitation hardening systems
Improvement of casting characteristics
Improvement of corrosion resistance
Improving machinability

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Engineering Materials
White cast iron

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Is produced by annealing process. It is soft, tough and easily machined metal

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