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The Properties Of Aluminium

Some important things about the properties of aluminium


aluminiums has a density of 2,7 g/cm3, roughly one-third that of steel.

aluminium alloys have tensile strengths in the range 70 to 700 mPa. the alloys most widely used for extrusion have strengths in the range 150–300 mPa. Unlike most grades of steel, aluminium does not become brittle at low
temperatures. Instead, its strength increases. at high temperatures, aluminium’s strength decreases. When exposed to
temperatures in excess of 100°C for prolonged periods, strength is affected to the extent that the weakening must be taken into account.

Linear expansion
Compared with other metals, aluminium has a relatively high coefficient of linear expansion. this has to be taken into account in some designs.

the good malleability of aluminium, which is essential for extruding profiles, is also exploited for rolling into strip or foil, as well as in other bending and forming operations, hot or cold.

aluminium is easy to machine using most methods – milling, drilling, cutting, punching, bending, etc. the energy requirement during machining is relatively low.

Features that facilitate joining are often incorporated in the profile. Welding (fusion and Friction Stir Welding), bonding and taping are other widely used methods.

aluminium is an excellent conductor of heat and electricity. an aluminium conductor weighs approximately half as much as a copper conductor having the same conductivity.

aluminium is a good reflector of both visible light and radiated heat.

Screening – EMC
Sealed aluminium boxes can effectively exclude or screen off electromagnetic radiation. the better the conductivity of a material, the better the shielding qualities.

Barrier properties
aluminium foil is impermeable to water, gases, odours, bacteria and light.