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

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

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Engineering Materials
Malleable cast iron

Is produced by annealing process. It is soft, tough, and easily machined metal
Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material
Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

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Engineering Materials
Dow metal contains

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

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