Engineering Materials
Addition of lead and bismuth to aluminium results in

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

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Engineering Materials
In spheroidising process, the steel is

Heated below the lower critical temperature and then cooled slowly
None of these
Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
Heated up to the lower critical temperature and then cooled in still air

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