Guides/Comparisons
2024 vs 7075 aluminium
2024-vs-7075-aluminiumAluminium alloy 2024 and Aluminium alloy 7075-T6 at a glance
This page compares Aluminium alloy 2024 and Aluminium alloy 7075-T6 using only values that carry a source, a test condition and an evidence level. Ranges run across temper, heat treatment and product form, measured at room temperature where the source says so.
- Composition: Copper (2024 3.8 to 4.9%; 7075 1.6%), Magnesium (2024 1.2 to 1.8%; 7075 2.5%).
- Yield strength: 7075 is higher (2024 260 to 324 MPa; 7075 503 MPa), about 1.7 times the midpoint of 2024.
- Tensile strength: 7075 is higher (2024 410 to 469 MPa; 7075 572 MPa), about 1.3 times the midpoint of 2024.
- Density: 7075 is higher (2024 2.78 g/cm³; 7075 2.8 g/cm³), a difference of under 10% at the midpoint.
- Young's modulus: 2024 is higher (2024 73.1 GPa; 7075 71 to 71.7 GPa), a difference of under 10% at the midpoint.
- Thermal conductivity: 7075 is higher (2024 120 to 121 W/(m·K); 7075 130 W/(m·K)), a difference of under 10% at the midpoint.
- Thermal expansion: 7075 is higher (2024 22.9 to 23.2 ppm/K; 7075 23.4 to 23.6 ppm/K), a difference of under 10% at the midpoint.
- Yield strength for each unit of density (calculated from each grade's midpoint values): Aluminium alloy 2024 105 MPa per g/cm³; Aluminium alloy 7075-T6 180 MPa per g/cm³.
"Higher" means the whole range is higher, not just one value. Where a value is a specified minimum, the table says "at least".
Side by side
| Property | Aluminium alloy 2024 | Aluminium alloy 7075-T6 |
|---|---|---|
| Yield strength | 260 to 324 MPa | 503 MPa |
| Tensile strength | 410 to 469 MPa | 572 MPa |
| Density | 2.78 g/cm³ | 2.8 g/cm³ |
| Young's modulus | 73.1 GPa | 71 to 71.7 GPa |
| Thermal conductivity | 120 to 121 W/(m·K) | 130 W/(m·K) |
| Melting point | no data | 532 to 635 °C |
| Thermal expansion | 22.9 to 23.2 ppm/K | 23.4 to 23.6 ppm/K |
| Yield strength per densitycalculated | 105 MPa per g/cm³ | 180 MPa per g/cm³ |
Composition
| Element | Aluminium alloy 2024 | Aluminium alloy 7075-T6 |
|---|---|---|
| Aluminium | balance | balance |
| Copper | 3.8 to 4.9% | 1.6% |
| Magnesium | 1.2 to 1.8% | 2.5% |
| Manganese | 0.3 to 0.9% | not listed |
| Silicon | up to 0.5% | not listed |
| Iron | up to 0.5% | not listed |
| Zinc | not listed | 5.6% |
| Chromium | not listed | 0.3% |
Shares are as printed in the sources, by weight.
When to use which
| Material | Best for | Weakest at |
|---|---|---|
| Aluminium alloy 2024 | A high-strength wrought aluminium alloy for aircraft fittings and structural parts (the datasheets list these uses; ASM typical T4 yield strength is 324 MPa) | Stress-corrosion cracking of the 2024-T351 temper in seacoast and salt-water conditions (NASA 1981), and pitting in salt water |
| Aluminium alloy 7075-T6 | High-strength aluminium parts where low mass and wrought forms such as tube, plate, bar or forging are useful | Stress-corrosion cracking in the short-transverse direction in T6, and relatively poor corrosion resistance in industrial and marine environments |
Where each is used
| Material | Use |
|---|---|
| Aluminium alloy 2024 | Aerospace structural parts and components of assemblies |
| Aluminium alloy 2024 | Structures and components in the aircraft and transportation industries |
| Aluminium alloy 2024 | Gears and shafts, bolts, nuts, couplings, hydraulic valve bodies and pistons |
| Aluminium alloy 7075-T6 | Aircraft structures and airframe parts |
| Aluminium alloy 7075-T6 | High-pressure hydraulic units |
| Aluminium alloy 7075-T6 | Launch vehicles and spacecraft |