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2195 aluminium alloy is an alloy in the wrought aluminium-copper family (2000 or 2xxx series). It is one of the most complex grades in the 2000 series, with at least 91.9% aluminium by weight. 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, and is fracture resistant at cryogenic temperatures.[1] It is one of the Weldalite family of aluminum-lithium alloys.[1]

2195 aluminium can be alternately referred to by the UNS designation A92195.

It is 30 % stronger and 5 % less dense than the 2219 alloy used in the original Space Shuttle external tank.[1]

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]

Chemical CompositionEdit

The alloy composition of 2195 aluminium is:[2][3]