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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 Lgende des figures Fran.cedilla.ais Anglais Seuil CSC CSC threshold Temprature (.degree. C.) Temperature (.degree. C.) Dure de revenu (h) Annealing duration (h) Mona-palier Single step Bi-palier Two-step Temps quivalent de revenu Equivalent annealing time 120.degree. C. (h) at 120.degree. C. (h) Temps quivalent a 120.degree. C. Equivalent time at 120.degree. C. (h) (h) Tri-palier A Three-step A Tri-palier B Three-step B Temps quivalent de revenu Equivalent annealing time 120.degree. C. (h) at 120.degree. C. (h)

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First Claim