High-temperature efficient aluminum copper magnesium alloys
View Patent ↗The disclosure provides for wrought products made of Al—Cu—Mg aluminum alloy composed as follows, as a percentage by weight, Cu corr : 2,6-3.7; Mg corr : 1.5-2.6, Mn: 0.2-0.5; Zr: ≦0.16; Ti: 0.01-0.15; Cr≦0.25; Si≦0.2; Fe≦0.2; other elements <0.05 the rest aluminum; with Cu corr >−0.9(Mg corr )+4.3 and Cu corr <−0.9(Mg corr )+5.0; where Cu corr =Cu−0.74(Mn−0.2)−2.28 Fe and Mg corr =Mg−1.73(Si−0.05) for Si≧0.05 and Mg corr =Mg for Si<0.05 and their manufacturing process.
1. A wrought product comprising an aluminum alloy consisting essentially of, as a percentage by weight,
Cu corr : 2.6-3.7
Mg corr : 1.5-2.6
Mn: 0.2-0.5
Zr: ≦0.16
Ti: 0.01-0.15
Cr ≦0.25
Si ≦0.2
Fe ≦0.2
other elements <0.05
remainder aluminum
wherein Cu corr >−0.9(Mg corr )+4.3 and Cu corr <−0.9(Mg corr )+5.0
in which Cu corr =Cu−0.74(Mn−0.2)−2.28 Fe and
Mg corr =Mg−1.73(Si−0.05) for Si≧0.05 and Mg corr =Mg for Si<0.05;
wherein said wrought product is aged such that the mechanical resistance R p0.2 is a maximum;
and wherein said wrought product is a wire or bar or screw or bolt or rivet having a substantially recrystallized grain structure.
2. The wrought product according to claim 1 , wherein said wrought product is present in a T8 temper and has a tensile yield stress R p0,2 in a longitudinal direction, of at least 460 MPa, and after aging at 150° C. for 2000 hours, a decrease of tensile yield stress in a longitudinal direction of less than 10%.
3. The wrought product of claim 1 , wherein said substantially recrystallized grain structure comprises a recrystallization rate of at least 80%.