HEAT-RESISTANT CONDUCTIVE ULTRAFINE-GRAINED ALUMINUM ALLOY AND METHOD FOR PRODUCTION THEREOF

摘要

FIELD: metallurgy.;SUBSTANCE: invention relates to the field of non-ferrous metallurgy and electrical engineering, in particular, to alloys based on aluminum, and can be used in the manufacture of electrical products such as conductors of round and square cross-section, conductive elements in the form of wires, plates and tires, wires of overhead power lines. Heat-resistant conductive ultrafine-grained aluminum alloy contains, %: magnesium 0.2–0.8, zirconium 0.2–0.5, impurities, including iron, silicon, manganese, chromium, vanadium, not more than 0.2, aluminum – the rest, the alloy has a microstructure with an average grain size of not more than 1 mcm and nanoscale particles of the Al₃Zr metastable phase with a L1₂ crystal lattice, which are evenly distributed over the volume of grains and have a spherical shape with a size of not more than 25 nm. Method for obtaining the alloy includes annealing the billet in the temperature range 300–450 °C for a duration of 30 to 350 hours and deformation by the method of intense plastic deformation at a pressure of 0.1–6.0 GPa, in the interval of homological temperatures 0.3–0.5 T_pl to the value of the true accumulated deformation e≥4.;EFFECT: invention is aimed at increasing the mechanical strength, electrical conductivity and thermal resistance of an aluminum alloy.;6 cl, 2 dwg, 2 tbl, 2 ex