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Copper is the main alloying ingredient in 2024 aluminum. It is very strong compared to most aluminum alloys and has average machinability, but the copper component of this alloy makes it susceptible to corrosion. Many items in this alloy are produced with a clad surface to protect the underlying material. In addition, 2024 is not considered weldable. Finally, the fatigue resistance of 2024 makes it a primary choice when the application is expected to be under stress or strain for prolonged periods.
Applications: aerospace applications, bolts, clock parts, computer parts, hydraulic valve parts, nuts, pistons, and gears.
ASTM
B209, B211
AMS
4037, 4120, QQ-A-225/6, QQ-A-250/4, WW-T700/3
Common Trade Names
UNS A92024, Al2024-O, Alclad 2024-O, AA2024-T3, Al2024-T3, Alclad 2024-T3, UNS A82024, Alclad 2024-T4/T351, Al2024-T4, Alclad 2024-T851
| Property | -O | -T3 | -T351/T4 | -T851 |
|---|---|---|---|---|
| Density | 0.1 lb/in³ | 0.1 lb/in³ | 0.1 lb/in³ | 0.1 lb/in³ |
| Ultimate Tensile Strength | 27 ksi (bare); 26 ksi (clad) | 70 ksi (bare); 65 ksi (clad) | 67 ksi (T351); 69 ksi (T4) | 75 ksi |
| Yield Tensile Strength | 11 ksi | 50 ksi (bare); 45 ksi (clad) | 47 ksi (T351); 45 ksi (T4) | 66 ksi |
| Fatigue Strength | 13 ksi | 20 ksi | 20 ksi | 17 ksi |
| Shear Strength | 18 ksi | 41 ksi (bare); 40 ksi (clad) | 41 ksi | 43 ksi |
| Shear Modulus | 4,060 ksi | 4,060 ksi | 4,060 ksi | 3,920 ksi |
| Hardness Rockwell | Brinell | N/A | 47 | B75 | 120 | B75 | 120 | B84 | 140 |
| Elongation at Break | 20% | 18% | 13% (T351); 16% (T4) | 4.9% |
| Modulus of Elasticity | 10,600 ksi | 10,600 ksi | 10,000 ksi | 10,000 ksi |
| Poisson's Ratio | 0.33 | 0.33 | 0.33 | 0.33 |
| Machinability Percentage | 30% | 70% | 70% | 70% |
| Melting Point | 935-1,180 °F | 935-1,180 °F | 930-1,180 °F | 930-1,180 °F |
| Specific Heat | 2.1 x 10^-1 BTU/lb-°F | 2.09 x 10^-1 BTU/lb-°F | 2.1 x 10^-1 BTU/lb-°F | 2.1 x 10^-1 BTU/lb-°F |
| Thermal Conductivity | 1,340 BTU-in/hr-ft²-°F | 840 BTU-in/hr-ft²-°F | 840 BTU-in/hr-ft²-°F | 1,050 BTU-in/hr-ft²-°F |
| Electrical Conductivity | 30% IACS | 30% IACS | 30% IACS | 30% IACS |
| Element | Percentage |
|---|---|
| Al | 93.5 |
| Cr | 0.1 max |
| Cu | 3.8 - 4.9 |
| Mg | 1.2 - 1.8 |
| Fe | 0.5 max |
| Mn | 0.3 - 0.9 |
| Si | 0.5 max |
| Zn | 0.25 max |
| Ti | 0.15 max |
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