ALUMINIUM-COPPER-MAGNESIUM ALLOYS THAT PERFORM WELL AT HIGH TEMPERATURE

摘要

The invention relates to wrought products made of an Al-Cu-Mg aluminium alloy of composition, in % by weight, Cucorr: 2.6 - 3.7; Mgcorr: 1.5 - 2.6; Mn: 0.2 - 0.5; Zr = 0.16; Ti: 0.01 - 015; Cr = 0.25; Si = 0.2; Fe = 0.2; other elements corr = 0.9(Mgcorr) + 4.3 and Cucorr = 0.9(Mgcorr) + 5.0; where Cucorr = Cu - 0.74(Mn - 0.2) - 2.28 Fe and Mgcorr = Mg - 1.73(Si - 0.05) for Si = 0.05 and Mgcorr = Mg for Si < 0.05 and their manufacturing process. These alloys are particularly of use for applications in which the products are maintained at temperatures of 100°C to 200°C, typically at around 150°C. Thus, the products according to the invention are of use for fastenings intended to be used in an engine for a motor vehicle, such as screws or bolts or rivets or for manufacturing parts of the nacelle and/or attachment masts of aircraft, aircraft wing leading edges and the fuselage of supersonic aircraft.