Question

12. Write the constituents properties and uses of the following alloys
a) Duralumin
b) brass

Answer 1

Explanation:

this us the answer

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Answer 2

Answer:

Duralumin

is an alloy made up of

• 90% aluminum,
• 4% copper,
• 0.51% magnesium and
• < 1% manganese.

Uses

Duralumin has the following uses:

• It is used for making wire, bar and rods for the screw machine products. It is used in places where good strength and good machinability are required.

• It is used in heavy-duty forgings, wheels, plates, extrusions, aircraft fittings, space booster tankage and trauck frame, and other suspension components. It finds applications in places where high strength is required, and services at elevated temperatures.

• It is used for making Aircraft structure, truck wheels, screw machine products, rivets and other structural application products.

• It is used as a sheet for the auto body panels.

• It is also used in forgings, in aircraft engine pistons, impellers of the jet engines and the compressor rings.

Brass

is an alloy made up of

• Copper,
• Zinc.

Uses

The Brasses are classified into 3 different categories based upon their composition and each type serves different purposes.

• The Alpha brasses, (worked cold,contains <40% zinc) are widely used in the manufacture of pins, bolts, screws, and ammunition cartridge cases.

• The Beta brasses,(>40% zinc, worked in higher temperatures) are less ductile but stronger and thus are suitable for the manufacture of faucet handles, sprinkler heads, window and door fittings, and other fixtures.

• The Third group of brasses includes those with other elements besides copper and zinc, added to improve physical and mechanical properties, corrosion resistance, or machinability or to modify colour.

Examples:

1. The lead brasses, which are more easily machined; the naval and admiralty brasses, in which a small amount of tin improves resistance to corrosion by seawater.
2. The aluminum brasses, which provide strength and corrosion resistance where the naval brasses may fail.