Product made of an AlCuMg alloy for aircraft structural elements
AssigneePechiney Rhenalu
InventorsTimothy Warner, Philippe Lassince, Philippe Lequeu
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Abstract
Rolled product for use in the manufacture of aircraft structural elements, made of an AlCuMg alloy processed by solution heat treatment, quenching and cold stretching. The product has a composition consisting essentially of, in % by weight: Fe<0.15; Si<0.15; Cu:3.8-4.4; Mg:1-1.5; Mn:0.5-0.8; Zr:0.08-0.15; other elements: <0.05 each and <0.15 total. This product has a thickness of between 6 and 60 mm, with an ultimate tensile strength Rm(L) in the quenched and stretched temper >475 MPa and yield stress R0.2(L)>370 MPa, with a ratio Rm(L)/R0.2(L)>1.25.
Claims9
Product for use in the manufacture of aircraft structural elements, said product having a composition consisting essentially of, in % by weight:
- Fe<0.15;
- Si<0.15;
- Cu:3.8-4.4;
- Mg:1-1.5;
- Mn:0.5-0.8;
- Zr:0.08-0.15;
- other elements:
- <0.05 each and <0.15 total;
- and formed by method steps consisting essentially of casting a plate or billet of said composition, homogenizing said plate or billet at a temperature of between 450 and 500° C., hot transforming said homogenized plate or billet by a process consisting essentially of at least one of rolling, forging or extruding, followed optionally by cold transforming, to obtain a basic product, solution heat treating said basic product, quenching said solution heat treated basic product and cold stretching said quenched basic product to obtain the product,
- said product having a thickness of between 6 and 60 mm, with an ultimate tensile strength Rm(L) in the quenched an stretched temper >475 MPa and yield stress R0.2 (L)>370 MPa, with a ratio Rm(L)/R0.2(L)>1.25.
Dependencies are inferred from the claim text.