ALUMINUM-BASED ALLOY AND METHOD OF MANUFACTURING INTERMEDIATE PRODUCTS FROM THIS ALLOY Russian patent published in 2002 - IPC

FIELD: non-ferrous metal alloys. SUBSTANCE: in particular, invention relates to high-strength low- density weldable alloys of system aluminum/copper/lithium, which can be used in aviation-space engineering. Proposed alloy includes following components, wt %: copper 3.0-3.5, lithium 1.5-1.8, zirconium 0.05-0.12, scandium 0.06-0.12, silicon 0.02-0.15, iron 0.02- 0.2, beryllium 0.00001-0.02, at least one element from the group including: magnesium 0.1-0.6, zinc 0.02-1.0, manganese 0.05-0.5, germanium 0.02-0.2, cerium 0.05-0.2, yttrium 0.005-0.02, titanium 0.005-0.05, and aluminum - the balance, ratio of copper to lithium content being 2.9-2.3. Invention also provides method of manufacturing intermediate products including heating of cast blank for rolling, hot rolling, tempering, stretching flattening, and triple-step artificial ageing. EFFECT: improved plasticity and crack resistance, including impact charge resistance, and increased stability of mechanical properties at long-term, low-temperature heatings. 2 cl, 4 tbl