Engineering Materials
Addition of lead and bismuth to aluminium results in

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

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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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