C - Chemistry – Metallurgy – 22 – F
Patent
C - Chemistry, Metallurgy
22
F
C22F 1/057 (2006.01) C22C 21/16 (2006.01)
Patent
CA 2056750
Abstract of the Disclosure Disclosed is a method of producing a sheet product having improved levels of toughness and fatigue crack growth resistance while maintaining high strength, comprising providing a body of an aluminum base alloy containing 4.2 to 4.7 wt.% Cu, 1.3 to 1.8% Mg, 0.8 to 1.3 wt.% Mn. 0.03 to 1 wt.% Zr, 0.15 wt.% max. Fe, 0.12 wt .% max. Si, the remainder aluminum, incidental elements and impurities and heating a body of the alloy to above 910°F to dissolve soluble constituents. Thereafter, the body is hot rolled in the range of about 600 to 900°F, solution heat treated for a time of less than about 15 minutes at a solution heat treating temperature, and rapidly cooled and naturally aged to provide a sheet product with improved levels of fatigue crack growth resistance while maintaining high strength.
Colvin Edward L.
Naser Delbert M.
Petit Jocelyn I.
Aluminum Company Of America
Smart & Biggar
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