for any aluminum properties and aluminum alloys are they so willingly used in all industries and construction?
The thin natural oxide film, which firmly "engages" with the parent metal, It provides many aluminum alloys a significant corrosion resistance in many atmospheric and chemical environments. Especially distinguished in this series alloys 1xxx, 3xxx, 5xxx and 6xxx.
Aluminum and aluminum alloys are good conductors of heat. The thermal conductivity of aluminum alloy is more than four times higher, than that of carbon steels. They begin to melt at a much lower temperature, than steel. The melting point of pure aluminum is about 660 ° C, and aluminum alloys depending on the degree of alloying begin to melt at lower temperatures, for example, at 515 ° C for alloy 2017 (D1).
Pure aluminum and some of its alloys have very high electrical conductivity (low electrical resistance), second only to metals including copper, which are used as electricity conductors. At the same time, on the high-voltage power lines, if it allows the degree of air pollution of the atmosphere, use it aluminum wires. They have a larger cross-section, than the equivalent copper wire, however and half the weight, What allow, in particular, less put the support and reduce their height.
Strength to weight ratio
The high ratio of strength / weight - relatively high strength at low density – determines the high efficiency of aluminum alloys and opens up many opportunities for replacing heavier metals without loss (and perhaps with an increase) in the bearing capacity of a product or part. This feature of the aluminum alloys in combination with a good corrosion resistance, and the ability to complete processing after the end of its life, provides them with widespread use production of containers and in transport engineering (aircraft, cars, passenger cars).
Aluminum at low temperatures
Aluminum alloys, especially alloys series 3xxx, 5xxx and 6xxx ideally suited for operation at low temperatures. Numerous data confirm, their ductility and toughness, as well as strength, above at low temperatures, down to absolute zero, than at "room" temperature.
Aluminum alloys are easily processed by most known metal processing technologies, and particularly easily pressed. Compression is the process of forcing hot metal through the die, forming profiles with complex cross-sections. Sometimes, This process is known as a more appropriate name - Extrusion. This property of aluminum alloys makes it possible to produce profiles of them with a virtually unlimited variety of cross-sectional shapes. This allows you to have the metal in those areas and thus, to ensure that the profile of the maximum load-bearing capacity under the influence of the given loads.
Methods aluminum compound
Details of aluminum alloy are joined by a large number of ways, including, quarrel, rations, riveting, screw connections, not to mention a wide variety of mechanical methods. welding of aluminum may seem difficult for those, who has experience only with steels and try to move it to the aluminum. Welding aluminum alloys consider pretty easy, when used proven techniques such, like consumable arc welding (ME) and tungsten non-consumable electrode (TIG) in an inert gas environment.
An important characteristic of the alloys is aluminum, what their isworn cycle almost completely closed – they are easy to reuse – retsiklingu – and, Unlike other construction materials, they are processed almost the same high-quality products.