Aluminum lithium Alloy is a new type of aluminum alloy with lithium as the main alloy element. It is the most important part of the aluminum alloy system. Because the Aluminum lithium system Aluminum Alloy has the corrosion resistance of low density, high stiffness, high strength, low temperature performance, excellent performance and excellent super-plastic forming, to replace the conventional Aluminum Alloy which can make the component quality reduce 15%, enhance the rigidity of 15%~20%, in the condition of considerable strength, lower density 10%, while the elastic modulus increased by 10%. Therefore, the Al - Li alloy aluminum alloy is considered as an ideal structural material in the aerospace industry.
We divide the current industrial Aluminum lithium Alloy into three groups:
1.Al-Li-Cu system (2020,2090)
2.Al-Li-Mg system (1464)
3.Al-Li-Cu-Mg system (2091,8090)

Aerospace aluminum alloy products and their state comparison
Standard	Aeronautics and Astronautics high strength aluminum alloy				Aeronautic and astronautic Al Li alloy
	Aluminum sheet	Aluminum plate	Aluminum forgings	Aluminum profile	Aluminum sheet	Aluminum plate	Aluminum forgings	Aluminum profile
High strength	7075 T6	7075 T651 7150 T651 7475 T651 71450 T651	－ － － －	7075 T6511 7175 T6511 7150 T6511 7050 T6511	8091 T8X 2090 T83	8091 T851 2091 T81	8091 T652	8090 T8X 2090 T86
Medium strength, corrosion resistance, damage tolerance	7075 T6 7075 T3 2214 T6 2014 T6 2219 T87	7010 T7651 2214 T651 2014 T651 7075 T651 7075 T7351 7050 T765 2124 T851 2219 T852	7050 T74 7075 T6 7075 T73 2014 T652 2024 T852	7050 T3511 2224 T3511 2219 T851 2024 T8511 2014 T6511 7050 T73511	2091 T8X 8090 T8X 2090 T8	8090 T8X 8090 T87711	2090 T652 2091 T852	8090 T8X 8091 T8511
High damage tolerance	2219 T39 2024 T3	2324 T39 2124 T351 2024 T351	2129 T3511 2024 T352	－ － －	2091 T3 2091 T84 8090 T81	8090 T857 8090 T8151 2091 T351 2091 T851	－ － － －	2091 T8 8090 T81 － －
Weldability, low temperature performance, super-plastic molding	－ － 7475	2219 2519 －	2219 2519 －	2219 2519 －	2090/8090 － －	2090/8090 － －	8090 － －	2090 － －