METHOD FOR PRODUCING SUPER-DUCTILE CLAD MATERIAL BASED ON ALUMINIUM Russian patent published in 2017 - IPC B23K20/04 B32B15/01 B23K103/10 

FIELD: metallurgy.

SUBSTANCE: chemical treatment is carried out in succession with 40% NaOH solution in water, 5% HNO₃ solution in water and tetrachloromethane of contact surfaces of high-strength plate 13-13.5 mm thick consisting of an alloy on the basis of aluminium containing, wt %: 3.5-4.5 zinc, 3.5-4.5 magnesium, 0.6-1.0 copper, 2.0-3.0 nickel, 0.25-0.3 zirconium, and cladding sheets with thickness of 1-1.1 mm of aluminium alloy. Cladding sheets are placed on surfaces of the high-strength plate and the high-strength plate is welded with the cladding sheets by hot rolling at temperature of 400-460°C with the cobbing of at least 50% for the first pass and total cobbing of 70-80% followed by cold rolling for 70-80% to obtain clad material with thickness of 1 mm.

EFFECT: production of corrosion resistant parts with elongation of more than 300 percent at high temperature deformation by superplastic forming method, the obtained parts have a long service life which allows to extend the field of their application.

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