Aluminium–lithium alloys (Al–Li alloys) are a set of alloys of aluminium and lithium, often also including copper and zirconium. Since lithium is the least dense elemental metal, these alloys are significantly less dense than aluminium. Commercial Al–Li alloys contain up to 2.45% lithium by mass. Alloying with lithium reduces structural mass by three effects: Displacement A lithium atom is lighter than an aluminium atom; each lithium atom then displaces one aluminium atom from the crystal lattice while. Aside from its, an aluminium–lithium alloy is also associated with particular generations, based primarily on when it was first produced, but secondarily on its lithium content. The first generation lasted from. • • • • (CFRP) • Richardson, Mike (14 October 2012). Aerospace Manufacturing. from the original on 9 March 2019.•. Al–Li alloys are primarily of interest to the industry for their weight advantage. On airliners, (formerly ) claims up to 10% weight reduction compared to, leading to up to 20% better, at a lower cost than Key world producers of aluminium–lithium alloy products are,, and. • Arconic Technical Center (Upper Burrell, Pennsylvania, USA) • Arconic Lafayette (Indiana, USA); annual capacity of 20,000 metric tons (22,000 short. • Grushko, Olga; Ovsyannikov, Boris; Ovchinnokov, Viktor (2016). Eskin, D. G. (ed.). Advances in metallic alloys. Vol. 8. CRC Press/Taylor & Francis Group. :.