Engineering Materials
Addition of silicon to aluminium results in

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

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Engineering Materials
Chromium in steel

Improves wear resistance, cutting ability and toughness
Improves cutting ability and reduces hardenability
Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
Gives ductility, toughness, tensile strength and anti-corrosion properties

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