ALUMINUM-LITHIUM ALLOYS WITH HIGH STRENGTH, HIGH DEFORMABILITY AND LOW COST Russian patent published in 2020 - IPC C22C21/12 C22C21/16 C22F1/57 

FIELD: chemistry; aircraft engineering.

SUBSTANCE: invention relates to aluminum-based alloy products, particularly Al-Cu-Li-Mg system. It can be used for production of sheet products used in aircraft building. Aluminum-lithium alloy contains, wt %: 3.5–4.5 Cu, 0.8–1.6 Li, 0.6–1.5 Mg, 0.03–0.6 of at least one grain-regulating element selected from a group consisting of Zr, Sc, Cr, V, Hf and other rare earth elements, up to 1.0 Zn, up to 1.0 Mn, up to 0.12 Si, up to 0.15 Fe, up to 0.15 Ti, up to 0.15–0.35 random impurities, and residue—aluminum. In heat treated to solid solution, quenched, stretched and artificially aged condition minimum longitudinal yield point of alloy is 71 kilopounds/inch². Alloy is produced by casting of ingot-ingot, homogenization of cast billet with production of homogenized cast billet, hot pressing by one or more methods selected from group consisting of rolling, pressing and forging, heat treatment for solid solution, hardening in cold water, optional stretching of hardened billet and artificial aging of hardened billet.

EFFECT: obtained alloy has high strength and deformability, as well as resistance to breakage and corrosion.

27 cl, 7 dwg, 9 tbl, 2 ex