FIELD: metallurgy.
SUBSTANCE: deformed, resistant to damages item out of aluminium alloy of 2000 series has following parameters: Cu 3.0-4.0 wt %, Mg 0.4-1.1 wt %, Mn up to 0.6 wt %, up to 0.25 wt % of re-crystallisation inhibitor, up to 0.25 wt % in sum Fe+Si, Ag 0.3-0.8 wt %, Zn up to 0.60 wt %, up to 0.1 wt % of grain reducing additive, the rest - aluminium and random elements and impurities. Also, summary contents of Ag and Zn are at least 0.3 wt %. Said Cu and Mg are present at ratio of 3.6-5 parts of Cu per 1 part of Mg.
EFFECT: improved combination of durability, fracture toughness and fatigue strength.
25 ck, 14 dwg, 18 tbl, 1 ex
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