FIELD: metallurgy.
SUBSTANCE: invention relates to metallurgy, in particular to thermally hardened aluminium alloys based on aluminium-magnesium-silicon system, used as materials for elements of welded structures in construction and transport machine building, including passenger car building. Aluminium alloy contains, wt.%: silicon 0.65–0.90, magnesium 0.40–0.75, copper 0.05–0.20, manganese 0.10–0.55, zirconium 0.03–0.12, hydrogen 0.5 10-5–4·10-5, at least one element from a group comprising strontium, gallium (in total or separately) 0.0005–0.030 and at least one element from a group comprising boron, carbon (in total or separately) 0.0001–0.003, as well as aluminium and unavoidable impurities — the rest.
EFFECT: alloy is characterized by high values of strength, fatigue life, corrosion resistance and weldability of semi-finished products.
4 cl, 5 dwg, 6 tbl, 3 ex
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