Engineering Materials
Dow metal contains

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

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Engineering Materials
Points of arrest for iron correspond to

There is nothing like points of arrest
Stages at which further heating does not increase temperature for some time
Stages at which properties do not change with increase in temperature
Stages at which allotropic forms change

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