Engineering Materials
A material is said to be allotropic, if it has

Atoms distributed in random pattern
Different crystal structures at different temperatures
Fixed structure at all temperatures
Any one of the above

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Engineering Materials
Dow metal contains

92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
90% magnesium and 9% aluminium with some copper
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
90% aluminium and 90% copper

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