Engineering Materials
Addition of copper to aluminium results in

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

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Engineering Materials
Amorphous material is one

In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
Which is not attacked by phosphorous
In which atoms align themselves in a geometric pattern upon solidification
Which emits fumes on melting

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