Engineering Materials
Addition of copper 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
Smelting is the process of

Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
All of these
Reducing the ore with carbon in the presence of a flux
Removing the impurities like clay, sand etc. from the iron ore by washing with water

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