HEAT-RESISTANT ALUMINIUM-BASED ALLOY AND METHOD FOR OBTAINING DEFORMED SEMI-FINISHED PRODUCTS FROM IT

摘要

FIELD: metallurgy.;SUBSTANCE: aluminium-based alloy contains the following components, wt %: copper 0.9-1.9, manganese 1.0-1.8, zirconium 0.2-0.64, scandium 0.01-0.12, iron 0.15-0.4, silicium 0.05-0.15, aluminium is the rest; at that, alloy contains zirconium and scandium in its structure in the form of nanoparticles of phase Al₃(Zr, Sc) with average size of not more than 20 nm and with crystal latitude L1₂; at that, alloy conductivity exceeds 53% IACS, and ultimate strength (σ_ult) after heating during 100 hours at 300°C exceeds 320 MPa. Method for obtaining deformed semi-finished product from the above alloy involves preparation of the melt of the above alloy at the temperature exceeding liquidus temperature not less than by 50°C; obtaining cast workpiece by means of melt crystallisation, deformation of cast workpiece at the temperature not exceeding 350°C; intermediate annealing of deformed workpiece at 300-455°C; deformation of the annealed workpiece at room temperature and annealing at 300-350°C so that the deformed semi-finished product is obtained.;EFFECT: obtaining alloy and semi-finished products from it, which have high mechanical and electrical properties.;7 cl, 2 dwg, 7 tbl, 6 ex