The 2xxx series alloys are not as corrosion resistant as most other aluminum alloys and intergranular corrosion may occur under certain conditions. Therefore, these sheet alloys are usually clad with high-purity alloys or 6xxx series magnesium-silicon alloys to provide galvanic protection to the core material, thereby greatly improving corrosion resistance.
Aluminum 2024 is divided into 2024-O, 2024-t3, 2024-t4, 2024-t5 and 2024-t351 according to the heat treatment temperature. The mechanical properties of these 2024 alloys may vary due to the tempering of the material.
2024-T3 aluminum is 2024 aluminum in the T3 temper. To achieve this temper, the metal is solution heat-treated, strain hardened, then naturally aged. 2024-T3 shall have an ultimate tensile strength of 400–430 MPa (58–62 ksi) and a minimum yield strength of 270–280 MPa (39–40 ksi). It has an elongation of 10-15%.
2024-T4 aluminum is 2024 aluminum in the T4 temper. To achieve this temper, the metal is solution heat-treated and naturally aged. It has the highest ductility compared to the other variants of 2024 aluminum.
2024-T6 aluminum is 2024 aluminum in the T6 temper. To achieve this temper, the metal is solution heat-treated and artificially aged until it meets standard mechanical property requirements. Uses: Aircraft fittings, gears and shafts, bolts, clock parts, computer parts, couplings, fuse parts, hydraulic valve bodies, missile parts, munitions, nuts, pistons, rectifier parts, worm gears, fastening devices, veterinary and orthopedic equipment, structures.
2024-O tempered aluminum has no heat treatment. It has an ultimate tensile strength of 140–210 MPa (21–30 ksi) and a maximum yield strength of 97 MPa (14,000 psi). The elongation (stretch before ultimate failure) of the material is 10–25%, which is allowed by the applicable AMS code.
Aluminum 2024 is one of the strongest 2xxx alloys, and copper and magnesium are the main elements in this alloy. The most commonly used tempered designs include 2024T3, 2024T351, 2024T4, Al 2024 T6 and 2024T4.
2024 aluminum alloy is widely used in the aircraft industry, such as aircraft skin panels, automotive panels, bulletproof armor, and forged and machined parts. AA 2024 Physical Properties
The physical properties of AA2024 are listed in the table below, including aluminum density, melting point, coefficient of thermal expansion, modulus of elasticity (modulus of elasticity), thermal conductivity, specific heat capacity, electrical conductivity and electrical resistance.
notes:
10-6·K-1= 10-6/K = 1 μm/m·°C
1 Ω mm²/m = 1 μΩ m
1 g/cm3 = 1 kg/dm3 = 1000 kg/m3
1 GPa = 1 kN/mm2
1 MPa = 1 N/mm2
MS/m = 0.58⋅% IACS
1 cal/(gram C) = 1 BTU/(pound degree Fahrenheit)
Original Source:https://www.aircraftaluminium.com/a/three-tempers-of-2024-aluminum-sheet.html
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