A process for the preparation of a high-strength wrought product from alznmgcu - alloy

摘要

The invention relates to a method of manufacture of a product rolled aluminium alloy al - zn - mg - cu to high mechanical strength, including: - the casting of a blank of an alloy of composition (% by weight): zn: 9, 0 - 11, 0 mg: 1, 8 - 3, 0, cu: 1, 2 - 2, 6 at least one of the elements mn (0, 05 - 0, 4), cr (0, 05 - 0, 30), zr (0, 05 - 0, 20), hf (0, 05 - 0, 5), v (0,05 - 0, 3), ti (0, 01 - 0, 2) and sc (0, 05 - 0, 3), the remainder aluminium and inevitable impurities, -, optionally, the homogenization of the blank, - hot transformation of this blank by rolling, extrusion or forging, - the solution and the quenching of the product obtained, -, optionally, a controlled stretching with a permanent elongation of between 1 and 3%, - the aging of the product at a temperature and a length such that the product reaches the maximum limit of elasticity in the direction of the compression. The present invention applies in particular to the elements of the extrados side of the wings of the aircraft.