For each of the following applications, match the metal or alloy that is most su

Question

For each of the following applications, match the metal or alloy that is most suitable.

Milling machine base

Walls of a steam boiler

High-speed aircraft

Drill bit

Cryogenic (very low temperature) container

Pyrotechnic (i.e., flares or fireworks)

High-temperature furnace elements to be used in oxidizing environments

Milling machine base

Tool steelStainless steelMagnesiumPlatinumTungstenZincBrassGray cast ironPlain carbon steelTitanium alloyAluminum

Walls of a steam boiler

Stainless steelPlatinumZincPlain carbon steelTungstenBrassAluminumGray cast ironTitanium alloyTool steelMagnesium

High-speed aircraft

Titanium alloyGray cast ironTool steelAluminumMagnesiumPlain carbon steelZincTungstenStainless steelPlatinumBrass

Drill bit

TungstenPlatinumMagnesiumAluminumBrassTool steelGray cast ironPlain carbon steelZincStainless steelTitanium alloy

Cryogenic (very low temperature) container

AluminumMagnesiumGray cast ironStainless steelTool steelTitanium alloyZincTungstenPlatinumBrassPlain carbon steel

Pyrotechnic (i.e., flares or fireworks)

Gray cast ironMagnesiumPlain carbon steelTitanium alloyZincAluminumBrassStainless steelTungstenTool steelPlatinum

High-temperature furnace elements to be used in oxidizing environments

ZincTungstenGray cast ironBrassTool steelPlatinumTitanium alloyStainless steelMagnesiumPlain carbon steelAluminum

Explanation / Answer

(a) Gray cast iron would be the best choice for an milling machine base because it is relatively easy to cast, is wear resistant, has good vibration damping characteristics, and is relatively inexpensive.

            (b) Stainless steel would be the best choice for a walls of steam boiler because it is corrosion resistant to the steam and condensate.

            (c) Titanium alloys are the best choice for high-speed aircraft blades because they are light weight, strong, and easily fabricated very resistant to corrosion. However, one drawback is their cost.

            (d) A tool steel would be the best choice for a drill bit because it is very hard retains its hardness at high temperature and is wear resistant, and, thus, will retain a sharp cutting edge.

            (e) For a cryogenic (low-temperature) container, an aluminum alloy would be the best choice; aluminum alloys have an FCC crystal structure, and therefore, are ductile at very low temperatures.

            (f) As a pyrotechnic in flares and fireworks, magnesium is the best choice because it ignites easily and burns readily in air with a very bright flame.

            (g) Platinum is the best choice for high-temperature furnace elements to be used in oxidizing atmospheres because it is very ductile, has a relatively very high melting temperature, and is highly resistant to oxidation.

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