7005 is an aluminium wrought alloy[1] used in bicycle frames. Due to its relative ease of welding, it does not require expensive heat treating. It is, however, harder to form, making manufacture more challenging.[2] It has an Ultimate Tensile Strength of 350 MPa, a Fatigue Strength of 150 MPa and a density of 2.78 g/cm3.[3] It does not need to be precipitation hardened, but can be cooled in air.[4]
The alloy composition of 7005 is:[6]
| 1 | Aluminium | 91.0% - 94.7% | |
| 2 | Chromium | 0.06% - 0.20% | |
| 3 | Copper | <=0.10 % | |
| 4 | <=0.40 % | ||
| 5 | 1.0% - 1.80% | ||
| 6 | Manganese | 0.20% - 0.70% | |
| 7 | <=0.35% | ||
| 8 | 0.010% - 0.060% | ||
| 9 | Zinc | 4.0% - 5.0% | |
| 10 | Zirconium | 0.080% - 0.20% | |
| 11 | Other, total | <= 0.15% |
| 1 | Density | 2.78 g/cm3 | |
| 2 | Elastic modulus | 70-80 GPa | |
| 3 | Poisson Ratio | 0.33 | |
| 4 | Thermal conductivity | 166 W/mK | |
| 5 | Ultimate Tensile Strength | 350 MPa | |
| 6 | Fatigue Strength | 150 MPa |