7005 aluminium alloy
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]
Specific forms of AL 7005 include
- 7005-O
- 7005-T5
- 7005-T53
- 7005-T6[5]
Chemical composition
The alloy composition of 7005 is:[6]
| No | Element | Percentage |
|---|---|---|
| 1 | Aluminium | 91.0% - 94.7% |
| 2 | Chromium | 0.06% - 0.20% |
| 3 | Copper | <=0.10 % |
| 4 | Iron | <=0.40 % |
| 5 | Magnesium | 1.0% - 1.80% |
| 6 | Manganese | 0.20% - 0.70% |
| 7 | Silicon | <=0.35% |
| 8 | Titanium | 0.010% - 0.060% |
| 9 | Zinc | 4.0% - 5.0% |
| 10 | Zirconium | 0.080% - 0.20% |
| 11 | Other, total | <= 0.15% |
Properties
| No | Property | Value |
|---|---|---|
| 1 | Density | 2.78 g/cm3 |
| 2 | Elastic modulus[1] | 70-80 GPa |
| 3 | Poisson Ratio[1] | 0.33 |
| 4 | Thermal conductivity[1] | 166 W/mK |
| 5 | Ultimate Tensile Strength[1] | 350 MPa |
| 6 | Fatigue Strength[1] | 150 MPa |
Further reading
References
- ^ a b c d e f "7005 aluminum alloy properties". 31 August 2012.
- ^ "Bicycle aluminum alloy". 14 August 2018.
- ^ "matweb Aluminium 7005".
- ^ Davis, Joseph R. (1993). Aluminum and Aluminum Alloys. ASM International. ISBN 9780871704962.
- ^ "Make it From". Make it From. Archived from the original on 2015-11-09.
- ^ "MatWeb - the Online Materials Information Resource". Archived from the original on 2014-04-27. Retrieved 2012-08-26.