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
Combined carbon in iron makes the metal

Soft and gives a fine grained crystalline structure
Hard and gives a fine grained crystalline structure
Hard and gives a coarse grained crystalline structure
Soft and gives coarse grained crystalline structure

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Engineering Materials
Steel contains

Elements like phosphorus, sulphur and silicon in varying quantities
Alloying elements like chromium, tungsten nickel and copper
50% or more iron
80% or more iron

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