Aluminum 2024-T81
Subcategory: 2000 Series Aluminum Alloy; Aluminum Alloy; Metal; Nonferrous Metal
Close Analogs:
Composition Notes:
A Zr + Ti limit of 0.20 percent maximum may be used with this alloy designation for extruded and forged products only, but only when the supplier or producer and the purchaser have mutually so agreed. Agreement may be indicated, for example, by reference to a standard, by letter, by order note, or other means which allow the Zr + Ti limit.
Aluminum content reported is calculated as remainder.
Composition information provided by the Aluminum Association and is not for design.
Key Words: Aluminium 2024-T81; UNS A92024; ISO AlCu4Mg1; NF A-U4G1 (France); DIN AlCuMg2; AA2024-T81, ASME SB211; CSA CG42 (Canada)
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Material Notes:
Information provided by Alcoa and the references. General 2024 characteristics and uses: Good machinability and surface finish capabilities. A high strength material of adequate workability. Has largely superceded 2017 for structural applications.
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.
Data points with the AA note have been provided by the Aluminum Association, Inc. and are NOT FOR DESIGN.
Physical Properties
| Physical Properties | Metric | English | Comments |
| Density | 2.78 g/cc | 0.1 lb/in³ | AA; Typical |
Mechanical Properties
| Hardness, Brinell | 128 | 128 | 500 kg load with 10 mm ball |
| Hardness, Knoop | 161 | 161 | Converted from Brinell Hardness Value |
| Hardness, Rockwell A | 48.9 | 48.9 | Converted from Brinell Hardness Value |
| Hardness, Rockwell B | 79 | 79 | Converted from Brinell Hardness Value |
| Hardness, Vickers | 146 | 146 | Converted from Brinell Hardness Value |
| Tensile Strength, Ultimate | 485 MPa | 70300 psi | |
| Tensile Strength, Yield | 450 MPa | 65300 psi | |
| Elongation at Break | 2 % | 2 % | Foil |
| Elongation at Break | 6 % | 6 % | In 5 cm; Sample 1.6 mm thick |
| Modulus of Elasticity | 72.4 GPa | 10500 ksi | Average of Tension and Compression. In Aluminum alloys, the compressive modulus is typically 2% greater than the tensile modulus |
| Poisson’s Ratio | 0.33 | 0.33 | |
| Fatigue Strength | 125 MPa | 18100 psi | 500,000,000 Cycles |
| Shear Modulus | 28 GPa | 4060 ksi | |
| Shear Strength | 295 MPa | 42800 psi |
Electrical Properties
| Electrical Resistivity | 4.49e-006 ohm-cm | 4.49e-006 ohm-cm | AA; Typical at 68°F |
Thermal Properties
| CTE, linear 68°F | 23.2 µm/m-°C | 12.9 µin/in-°F | AA; Typical; Average over 68-212°F range. |
| CTE, linear 250°C | 24.7 µm/m-°C | 13.7 µin/in-°F | Average over the range 20-300ºC |
| Specific Heat Capacity | 0.875 J/g-°C | 0.209 BTU/lb-°F | |
| Thermal Conductivity | 151 W/m-K | 1050 BTU-in/hr-ft²-°F | AA; Typical at 77°F |
| Melting Point | 502 – 638 °C | 935 – 1180 °F | AA; Typical range based on typical composition for wrought products 1/4 inch thickness or greater. Eutectic melting is not eliminated by homogenization. |
| Solidus | 502 °C | 935 °F | AA; Typical |
| Liquidus | 638 °C | 1180 °F | AA; Typical |
Processing Properties
| Annealing Temperature | 413 °C | 775 °F | |
| Solution Temperature | 256 °C | 493 °F |