PRODUCTS MADE OF ALUMINIUM-COPPER-LITHIUM ALLOY WITH IMPROVED FATIGUE PROPERTIES Russian patent published in 2018 - IPC C22F1/57 C22C21/12 C22C1/02 

FIELD: metallurgy.

SUBSTANCE: invention relates to rolling products from aluminium-copper-lithium alloys, which can be used for the production of structural elements. Method of manufacturing a plate with a thickness of at least 80 mm involves obtaining a liquid metal bath from an alloy containing, in wt. %: Cu 2.0–6.0; Li 0.5–2.0; Mg 0–1.0; Ag 0–0.7; Zn 0–1.0 and at least one element selected from the group of Zr, Mn, Cr, Sc, Hf and Ti, wherein the amount of said elements is 0.05 to 0.20 Zr, from 0.05 to 0.8 Mn, from 0.05 to 0.3 Cr, from 0.05 to 0.3 Sc, from 0.05 to 0.5 Hf and from 0.01 to 0.15 Ti, Si ≤ 0.1; Fe ≤ 0.1; impurities ≤ 0.15 in total and ≤ 0.05 each, the balance is aluminium, wherein the hydrogen content in the bath is maintained below 0.4 ml / 100 g, and the oxygen content measured above the melt surface is below 0.5 vol. %, semi-continuous vertical casting using a distributor made of carbon fabric, homogenising the slab before or after optional machining, hot rolling and, optionally, cold rolling to obtain a plate whose thickness is at least 80 mm, solution treatment and quenching, optionally, removing internal stresses by plastic deformation with a degree of deformation of at least 1 %.

EFFECT: invention is aimed at improving the properties of thick plates.

16 cl, 6 dwg, 3 tbl, 1 ex