Thick alznmgcu alloy products having improved properties

Details Thick alznmgcu alloy products having improved properties Thick alznmgcu alloy products having improved properties

C - Chemistry, Metallurgy

22

C

C22C 21/10 (2006.01) C22F 1/053 (2006.01)

Patent

CA 2244148

A rolled, forged or extruded product made of an AlZnMgCu alloy and having a thickness of more than 60 mm, and a composition as follows (in wt %): 5.9 < Zn < 8.7, 1.7 < Mg < 2.5, 1.4 < Cu < 2.2, Fe < 0.14, Si < 0.11, 0.05 < Zr < 0.15, Mn < 0.02, Cr < 0.02, with Mg + Cu < 4.1, other elements < 0.05 each and < 0.10 in total. The product is treated by dissolving, quenching and optionally annealing, and the T7451 and T7452 treated product has the following properties: (a) a quarter-thickness yield strength R0.2 of over 400 MPa in directions L and TL, (b) a planar deformation resistance greater than 26 MPa 2ROOT m in direction S-L, and greater than 74 - 0.08e - 0.07 R0.2L MPa 2ROOT m in direction L-T (e = thickness in mm), and (c) a stress corrosion threshold higher than 240 MPa. Said products are particularly useful for making structural members for aircraft, and wing spars in particular.

L'invention concerne un produit laminé, forgé ou filé en alliage AlZnMgCu d'épaisseur > 60 mm, de composition (% en poids): 5,9 < Zn < 8,7; 1,7 < Mg < 2,5; 1,4 < Cu < 2,2; Fe < 0,14; Si < 0,11; 0,05 < Zr < 0,15; Mn < 0,02; Cr < 0,02; avec Mg + Cu < 4,1; autres éléments < 0,05 chacun et < 0,10 au total; ce produit étant traité par mise en solution, trempe et éventuellement revenu et présentant à l'état traité T7451 et T7452 les propriétés suivantes: a) une limite élastique R0,2 mesurée à quart-épaisseur > 400 MPa en sens L et TL, b) une tenacité en déformation plane sens S-L > 26 MPa~ et sens L-T > 74 - 0,08e - 0,07 R0,2L MPa~m (e = épaisseur en mm), c) un seuil de corrosion sous tension > 240 MPa. Les produits selon l'invention sont utilisés notamment pour la fabrication d'éléments de structure d'avions, en particulier des longerons d'ailes.

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