ALUMINIUM-BASED ALLOY, AND METHOD FOR PRODUCTION OF DEFORMED SEMI-FINISHED PRODUCTS THEREOF Russian patent published in 2016 - IPC C22C21/00 C22C1/02 C22F1/04 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly to aluminium-based deformable alloys, and can be applied to production of deformed semi-finished products in form of pressed profiles, rods, tubes, rolled plates and sheets, intended for use in construction, ship building, aircraft, automotive, and other industries. Aluminium-based alloy contains, wt.%: manganese 0.5-2.0, iron 0.2-0.6, magnesium 0.5-1.5, zirconium 0.2-0.6, silicon 0.15-0.6, copper 0.1-0.3, zinc 0.05-0.5, and aluminium - the rest, at ratio Zr/Si = 1 to 2, wherein zirconium in alloy structure is present in form of secondary cubic phase discharges Al₃Zr with grid L1₂ and with average size not more than 20 nm. Method for production of deformed semi-finished products from aluminium-based alloy includes production of molten alloy, obtaining ingot by melt crystallisation, obtaining deformed semi-finished product by deformation of cast ingot, and thermal treatment of deformed semi-finished product, wherein melt crystallisation is performed at temperature exceeding alloy liquefaction by not less than 50°C, and cooling rate in crystallisation interval is not less than 20 K/s, deformation of cast piece is performed at temperatures not exceeding 450 °C, and heat treatment of ready deformed semi-finished product is performed at temperatures 300 to 400 °C. Particularly, ultimate strength exceeds 250 MPa, relative elongation exceeds 8 %, and yield point is above 200 MPa.

EFFECT: technical result is increased level of mechanical properties, including after heating at temperatures of up to 300 °C, which achieved without use of ingot homogenisation or quenching of deformed semi-finished products.

4 cl, 1 ex, 3 tbl, 5 dwg