US 11,746,400 B2
Ultra-high strength aluminum alloy products and methods of making the same
Sazol Kumar Das, Acworth, GA (US); Rajeev G. Kamat, Marietta, GA (US); Samuel Robert Wagstaff, Marietta, GA (US); Simon William Barker, Woodstock, GA (US); Rajasekhar Talla, Woodstock, GA (US); and Tudor Piroteala, Acworth, GA (US)
Assigned to Novelis Inc., Atlanta, GA (US)
Filed by Novelis Inc., Atlanta, GA (US)
Filed on May 8, 2020, as Appl. No. 16/870,008.
Claims priority of provisional application 62/856,204, filed on Jun. 3, 2019.
Prior Publication US 2020/0377976 A1, Dec. 3, 2020
Int. Cl. C22C 21/10 (2006.01); C22F 1/053 (2006.01); C21D 9/00 (2006.01); C21D 8/02 (2006.01)
CPC C22C 21/10 (2013.01) [C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 9/00 (2013.01); C22F 1/053 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An aluminum alloy for a rolled aluminum alloy product, the aluminum alloy comprising 7.0 to 11.0 wt. % Zn, 2.2 to 3.0 wt. % Mg, 1.2 to 2.5 wt. % Cu, less than 0.10 wt. % Mn, up to 0.25 wt. % Cr, up to 0.20 wt. % Si, 0.05 to 0.30 wt. % Fe, up to 0.10 wt. % Ti, 0.05 to 0.25 wt. % Zr, up to 0.25 wt. % Sc, up to 0.15 wt. % impurities, and Al,
wherein the aluminum alloy comprises a yield strength greater than 700 MPa when in a T9 temper;
wherein a combined content of Zr and Sc ranges from 0.10 to 0.25 wt. %;
wherein the combined amount of Zn, Mg, and Cu is from 11 wt. % to 16 wt. %; and
wherein a mass fraction of Mg2Zn in the aluminum alloy microstructure is at least 10%.