Manufacturing process for a high strength work hardened product made of AlZnMgCu alloy

Abstract

The purpose of the invention is a process for the manufacture of a work-hardened product made of a high mechanical strength Al—Zn—Mg—Cu aluminium alloy consisting of: casting an ingot made of an alloy with 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 (0.05-0.3), 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 being made of aluminium and inevitable impurities, possibly homogenisation of said ingot, hot transformation of said ingot by rolling, extrusion or forging, solution heat treatment and quenching of the product obtained, possibly controlled stretching with a permanent set between 1 and 5%, annealing of the product at a temperature and with a duration such that the product reaches the maximum compression yield stress in the L direction. The invention is applicable particularly to upper wing members of aircrafts. 1 Légende des figures Français Anglais Seuil CSC CSC threshold Température (° C.) Temperature (° C.) Durée de revenu (h) Annealing duration (h) Mona-palier Single step Bi-palier Two-step Temps équivalent de revenu Equivalent annealing time à 120° C. (h) at 120° C. (h) Temps équivalent a 120° C. Equivalent time at 120° C. (h) (h) Tri-palier A Three-step A Tri-palier B Three-step B Temps équivalent de revenu Equivalent annealing time à 120° C. (h) at 120° C. (h)

Dependencies are inferred from the claim text.