Engineering Materials
Closed packed hexagonal space lattice is found in

Alpha-iron, tungsten, chromium and molybdenum
Zinc, magnesium, cobalt, cadmium, antimony and bismuth
None of these
Gamma-iron, aluminium, copper, lead, silver and nickel

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Engineering Materials
White cast iron

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

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Engineering Materials
Tungsten in steel

Improves wear resistance, cutting ability and toughness
Improves cutting ability and reduces hardenability
Gives ductility, toughness, tensile strength and anti-corrosion properties
Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

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