Aircraft aluminum is widely used in the aerospace field covering skins, beams, ribs, stringers, bulkheads, landing gears,crew compartment, front fuselage, mid-fuselage, rear fuselage, vertical and horizontal stabilizer. The amount of aluminum alloy used in civil aircraft is very high.
For example, the aluminum alloy used in the Boeing 767 passenger aircraft accounts for about 81% of the weight of the airframe structure. Some aviation aluminum alloys have good low temperature properties and can work in liquid hydrogen and liquid oxygen environments, so they are good materials for liquid rockets.
2219 aluminum alloy is a kind of American deformed aluminum. It has has poor corrosion resistance, but has good machining performance and good performance in arc welding and spot welding. It is suitable for for structural parts and high-strength welding parts that work at a high temperature of 315 ℃.
2219-T8 aluminum sheet has high resistance to stress corrosion cracking. 2219 aluminum alloy sheet is mainly used in the production of aircraft fuselage, wings, empennage,etc. It is also used in high-temperature structural applications including space boosters and fuel tanks.
Fuel tank: The wing fuel tank is a part of the wing structure. It is made of the same material as the wing structure, and the joints are sealed with oil-proof sealant. Because aluminum alloy has the advantages of light weight, high strength, easy forming and easy welding, it is very commonly used in fuel tank structures.
Space boosters: It is chosen for its light weight and its ability to withstand the stresses that occur during launch and operation in space, which has been used on Apollo spacecraft, the Skylab, the space shuttles and the international space station.
Liquidus temperature: 643℃ (1190F) Initial melting temperature: 543℃ (1010F)
Specific heat capacity：When the temperature is 20℃(68F), it is 882J/(kg·K) [0.210Btu] /(Ib·F) ]
O temper， 170W/(m·K) [98.2Btu] /(ft·h·F) ] ；
T31 and T37 temper：116W/(m·K) [67.0Btu] /(ft·h·F) ] .
T62, T81, T87 temper：130W/(m·K) [75.1Btu] /(ft·h·F) ] .
0.33 at 20°C (68F)
Tension: 73.8GPa (10.7×106psi), compression 75.2GP
For different tempers, the appropriate combination of aging time and temperature is also different.