CORROSION-RESISTANT ALUMINUM-BASE ALLOY, METHOD OF PRODUCTION OF SEMIFINISHED PRODUCTS AND ARTICLE FOR THIS ALLOY Russian patent published in 2001 - IPC

FIELD: corrosion-resistant aluminum-base alloy and methods of production of semifinished products and articles from these alloys. SUBSTANCE: corrosion-resistant alloy based on aluminum contains, wt.%: Mg, 2.0-5.8; Li, 1.3-2.3; Cu, 0.01-0.3; Mn, 0.03-0.5; Be, 0.0001-03; at least one metal selected from group including Zr and Sc, 0.02-0.25; at least one metal taken from group including Ca and Ba, 0.002-0.1; aluminum, the balance. In this case, optimal content of zirconium equals: wt.% of Zr=0.08+0.07x(Li, 2.3 wt. %)-0.3x(Sc, wt. %). Method of production of semifinished products includes preparation of said alloy, casting of ingots, homogenization at 400-500 C, hot deformation, intermediate annealing at 250-450 C, final deformation, solid solution heat treatment at 350-480 C hardening at rate of 0.5-3 Vcrit and aging at 100-200 C for 0.5-36 h. Stamping after full heat treatment results in the following product properties in longitudinal and height directions, respectively: σ_V=440 MPa and 395 MPa; σ_0,2=325 MPa and 300 MPa; δ=17% and 10%; ϕ= 21% and 15%. Critical stress at constant load in corrosion medium in height direction is σ_crit=120 MPa. EFFECT: higher technological effectiveness in cold deformation and increased corrosion resistance with preserved high level of mechanical properties. 10 cl, 2 tbl, 3 ex