7005 aluminium alloy

7005 is an aluminium alloy used 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.

It has an Ultimate Tensile Strength of 350MPa, a Fatigue Strength of 150MPa and a density of 2.78g/cm³ [1] compared to a Ultimate Tensile Strength of 310MPa and Fatigue Strength of 96.5 MPa and a density of 2.70g/cm³ for 6061 aluminium alloy. [2]

It does not need to be precipitation hardened, unlike 6061, but can be cooled in air.[3]

Specific forms of AL 7005 include:

• 7005-O
• 7005-T5
• 7005-T53
• 7005-T6

[4]

Chemical composition

The alloy composition of 7005 is:

• Aluminium 91.0% - 94.7%
• Chromium 0.06% - 0.20%
• Copper <=0.10 %
• Iron <=0.40 %
• Magnesium 1.0% - 1.80%
• Manganese 0.20% - 0.70%
• Silicon <=0.35%
• Titanium 0.010% - 0.060%
• Zinc 4.0% - 5.0%
• Zirconium 0.080% - 0.20%
• Other, total <= 0.15%

[5]

References

1. "matweb Aluminium 7005".
2. "matweb Aluminium 6061-T6".
3. Davis, Joseph R. (1993). Aluminum and Aluminum Alloys. ASM International. ISBN 9780871704962.
4. "Make it From". Make it From. Archived from the original on 2015-11-09.
5. "Archived copy". Archived from the original on 2014-04-27. Retrieved 2012-08-26.CS1 maint: archived copy as title (link)