Engineering Materials
Addition of lead and bismuth to aluminium results in

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

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Engineering Materials
Pick up wrong statement about wrought iron

It contains carbon of the order of 0 to 0.25%
It is very soft and ductile
It melts at 1535°C
It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling

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