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
  1. 7005-O
  2. 7005-T5
  3. 7005-T53
  4. 7005-T6[5]

Chemical composition

The alloy composition of 7005 is:[6]

7005 Aluminum alloy
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
  1. "7005 aluminum alloy properties". 31 August 2012.
  2. "Bicycle aluminum alloy". 14 August 2018.
  3. "matweb Aluminium 7005".
  4. Davis, Joseph R. (1993). Aluminum and Aluminum Alloys. ASM International. ISBN 9780871704962.
  5. "Make it From". Make it From. Archived from the original on 2015-11-09.
  6. "MatWeb - the Online Materials Information Resource". Archived from the original on 2014-04-27. Retrieved 2012-08-26.

Aluminum alloy table
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