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. 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.
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. It is 30 % stronger and 5 % less dense than the 2219 alloy used in the original Space Shuttle external tank.
2195 is used for the propellant tanks of the Falcon 9 Full Thrust orbital launcher, and for the new ULA Vulcan first stage.
Chemical Composition
The alloy composition of 2195 aluminium is:
- 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
- ^ Super Lightweight External Tank, NASA, retrieved 12 Dec 2013.
- "How Light Metals Help SpaceX Land Falcon 9 Rockets with Astonishing Accuracy". Light Metal Age. 26 April 2019. Archived from the original on 28 August 2023. Retrieved 9 May 2024.
- "Falcon 9". SpaceX. 2013. Archived from the original on 24 September 2013. Retrieved 2013-12-06.
- Häusler, Ines; Schwarze, Christian; Bilal, Muhammad; Ramirez, Daniela; Hetaba, Walid; Kamachali, Reza; Skrotzki, Birgit (2017). "Precipitation of T1 and θ′ Phase in Al-4Cu-1Li-0.25Mn During Age Hardening: Microstructural Investigation and Phase-Field Simulation". Materials. 10 (2) 117. doi:10.3390/ma10020117. ISSN 1996-1944. PMC 5459132. PMID 28772481.
- "2195 Aluminum Composition Spec". www.matweb.com. Retrieved 2024-02-18.
Aluminium alloy table
| Aluminium alloys | |
|---|---|
| Introduction | |
| Al 1000 series (pure) | |
| Al-Cu 2000 series | |
| Al-Mn 3000 series | |
| Al-Si 4000 series | |
| Al-Mg 5000 series | |
| Al-Mg-Si 6000 series | |
| Al-Zn 7000 series | |
| 8000 series (misc.) | |
| Named alloys |
|