Engineering Materials
For the allotropic forms of iron, the points of arrest are

Constant for all metals
The points where there is no further flow of metal
The points where no further change occurs
The points of discontinuity

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Engineering Materials
Combined carbon in iron makes the metal

Hard and gives a fine grained crystalline structure
Soft and gives coarse grained crystalline structure
Soft and gives a fine grained crystalline structure
Hard and gives a coarse grained crystalline structure

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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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