Engineering Materials
Points of arrest for iron correspond to

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

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Engineering Materials
Dow metal contains

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

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