The use of a substance depends on its nature. Because aluminum has many excellent properties, it is widely used.

The density of (1) aluminum is very small, only 2.7 g/cm3. Although it is soft, it can be made into various aluminum alloys, such as hard aluminum and ultra-hard aluminum. Rust-proof aluminum, cast aluminum, etc. These aluminum alloys are widely used in aircraft, automobiles, trains, ships and other manufacturing industries. In addition, space rockets, space shuttles and artificial satellites also use aluminum and its alloys in large quantities. For example, supersonic aircraft consists of about 70% aluminum and its alloys. Aluminum is also widely used in shipbuilding, and the amount of aluminum used in a large passenger ship often reaches several thousand tons.

(2) The conductivity of aluminum is second only to that of silver and copper. Although its conductivity is only 2/3 of that of copper, its density is only13 of that of copper, so the quality of aluminum wire is only half that of copper wire when transmitting the same amount of electricity. The oxide film on aluminum surface not only has corrosion resistance, but also has certain insulation, so aluminum is widely used in electrical appliance manufacturing, wire and cable industry and radio industry.

(3) Aluminum is a good conductor of heat, and its thermal conductivity is three times greater than that of iron. In industry, aluminum can be used to make various heat exchangers, heat dissipation materials and cookers.

(4) Aluminum has good ductility (its ductility is second only to that of gold and silver). In the temperature range of 100℃ ~ 150℃, aluminum foil thinner than 0.0 1 mm can be made. These aluminum foils are widely used for packaging cigarettes, sweets and so on. , can also be made into aluminum wire and aluminum strip, and can be rolled into various aluminum products.

(5) The aluminum surface is not easy to be corroded because of the dense oxide protective film, and it is often used to manufacture chemical reactors, medical devices, refrigeration devices, oil and gas pipelines, etc.

(6) Aluminum powder has silvery white luster (generally, the color of metal in powder is mostly black), and it is often used as coating, commonly known as silver powder and silver paint, which protects iron products from corrosion and is beautiful.

(7) When aluminum burns in oxygen, it can release a lot of heat and dazzling light, and it is often used to make explosive mixtures, such as ammonium aluminum explosive (made of ammonium nitrate, charcoal powder, aluminum powder, soot and other combustible organic substances), combustion mixture (such as bombs and shells made of thermite, which can be used to attack targets that are difficult to catch fire or tanks and cannons) and ignition mixture (such as barium nitrate 68%, aluminum powder 28%, shellac).

Thermite is often used to melt refractory metals and weld railway tracks. Aluminum is also used as a deoxidizer in steelmaking. Aluminum powder, graphite and titanium dioxide (or oxides of other high-melting metals) are evenly mixed in a certain proportion, coated on the metal, and calcined at high temperature to make high-temperature resistant cermets, which have important applications in rocket and missile technology.

(9) Aluminum plate has good reflective performance. The purer the aluminum, the better the reflection ability. So it is often used to make high-quality mirrors, such as solar cooker mirrors.

(10) aluminum has sound absorption performance and good sound effect, so it is also commonly used in broadcast rooms and indoor ceilings of modern large buildings.

But eating more aluminum can cause brain poisoning. Such as Alzheimer's disease.

The above is some information about aluminum alloy, I hope it will help you.