Chemistry:2195 aluminium alloy
2195 aluminium alloy is an alloy in the wrought aluminium-copper family (2000 or 2xxx series). It is one of the Weldalite family of Aluminium–lithium alloys.[1] It is one of the most complex grades in the 2000 series, with at least 91.9% aluminium by weight. 2195 aluminium can be alternately referred to by the UNS designation A92195.
Properties
Like most other aluminium-copper alloys, 2195 is a high-strength alloy, with bad workability, and poor corrosion resistance. Being highly alloyed, it tends to fall on the higher strength and lower corrosion resistance side. As a wrought alloy, it is not used in casting. It can be welded, particularly by friction stir welding, and is fracture resistant at cryogenic temperatures.[1]
Applications
The high strength to weight ratio of this alloy has resulted in its aerospace applications such as the Space Shuttle Super Lightweight external tank.[1] It is 30 % stronger and 5 % less dense than the 2219 alloy used in the original Space Shuttle external tank.[1]
2195 is used for the propellant tanks of the Falcon 9 Full Thrust orbital launcher,[2]Cite error: Closing </ref> missing for <ref> tag[3]
- Aluminium: 91.9 to 94.9%
- Copper: 3.7 to 4.3%
- Lithium: 0.8 to 1.2%
- Magnesium: 0.25 to 0.8%
- Silver: 0.25 to 0.6%
- Zirconium: 0.08 to 0.16%
- Iron: 0.15% max
- Silicon: 0.12% max
- Titanium: 0.1% max
- Zinc: 0.25% max
- Residuals: 0.15% max
References
Aluminium alloy table
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