公开(公告)号：AT555223T

公开(公告)日：2012-05-15

申请号：AT01977394

申请日：2001-10-04

Applicant: ALCOA INC

Inventor： CHAKRABARTI DHRUBA ,  LIU JOHN ,  GOODMAN JAY ,  VENEMA GREGORY ,  SAWTELL RALPH ,  KRIST CYNTHIA ,  WESTERLUND ROBERT

IPC: C22C21/10 ,  C22F1/00 ,  C22F1/053

Abstract: Aluminum alloy products, such as plate, forgings and extrusions, suitable for use in making aerospace structural components like integral wing spars, ribs and webs, comprises about: 6 to 10 wt. % Zn; 1.2 to 1.9 wt. % Mg; 1.2 to 2.2 wt. % Cu, with Mg (Cu + 0.3); and 0.05 to 0.4 wt. % Zr, the balance Al, incidental elements and impurities. Preferably, the alloy contains about 6.9 to 8.5 wt. % Zn; 1.2 to 1.7 wt. % Mg; 1.3 to 2 wt. % Cu. This alloy provides improved combinations of strength and fracture toughness in thick gauges. When artificially aged per the three stage method of preferred embodiments, this alloy also achieves superior SCC performance, including under seacoast conditions.