| 摘要 |
The invention relates to a welded product made of an aluminum alloy having the composition, in wt %, of Mg: 4.0 - 5.0; Li: 1.0 - 1.6; Zr: 0.05 - 0.15; Ti: 0.01 - 0.15; Fe: 0.02 - 0.2; Si: 0.02 - 0,2; Mn: = 0.5; Cr = 0.5; Ag: = 0.5; Cu = 0.5; Zn = 0.5; Se < 0.01; other elements: < 0.05; wherein the remainder is aluminum and the method for manufacturing same involves, consecutively: producing a molten metal bath so as to produce an aluminum alloy having the composition according to the invention, casting said alloy in crude form, optionally homogenizing the resulting cast product, heat deformation and optional cold deformation, an optional heat treatment at a temperature of between 300 and 420ºC in one or more stages, a solution heat treatment of the resulting deformed product, and tempering, optional cold deformation of the resulting solution heat treated and tempered product, and return to a temperature of less than 150ºC. The products according to the invention have improved toughness and are useful in manufacturing aircraft structural elements, preferably a fuselage skin, a fuselage frame or a rib. |
