METHOD OF MANUFACTURE OF ALUMINIUM ALLOY HIGHLY RESISTANT TO DAMAGE Russian patent published in 2008 - IPC C22F1/04 C22C21/08 C22C21/16 C22C21/10 

FIELD: metallurgy.

SUBSTANCE: said utility invention relates to the manufacture of products of a rolled aluminium alloy highly resistant to damage. The method involves casting an ingot with a chemical composition selected from the group consisting of AA2000, AA5000, AA6000, and AA7000 alloys, homogenisation and/or heating of the ingot after casting, hot rolling of the ingot into a hot-rolled product and, optionally, cold rolling of the hot-rolled product into a cold-rolled product. After the hot rolling, the hot-rolled product is cooled from the hot-rolling mill output temperature (T_out) to 150°C or lower, at a controlled cooling rate decreasing within the set range according to a continuous cooling curve determined using the following expression: T(t)=50-(50-T_out)e^α-t, where T(t) is the cooling temperature (°C) as a function of the cooling time (hours), t is the cooling time (hours), and α is a parameter determining the cooling rate, within a range of -0.09±0.05 (hr^-1).

EFFECT: enhanced impact strength; resistance to growth of fatigue cracks, and corrosion resistance without strength deterioration.

19 cl, 7 tbl, 1 dwg, 2 ex