Engineering Materials
Gun metal contains

85 - 92% copper and rest tin with little lead and nickel
70 - 78% copper and rest tin
90% copper and 10% tin
70% copper and 30% zinc

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Engineering Materials
Amorphous material is one

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

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