Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1992-03-06
1993-05-25
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148552, 148700, 148417, 148439, 428654, C22F 104
Patent
active
052136396
ABSTRACT:
A method of producing a sheet product and improved products having improved levels of toughness and fatigue crack growth resistance at good strength levels. The method comprises providing an aluminum base alloy containing 4 to 4.5% Cu, 1.2 to 1.5% Mg, 0.4 to 0.6% Mn, 0.12% max. Fe, 0.1% max. Si, the remainder aluminum, incidental elements and impurities and hot rolling the alloy, heating the alloy to above 910.degree. F. and additionally hot rolling it in a range of about 600.degree. to 900.degree. F., solution heat treating, preferably for a time of less than about 15 minutes at a solution heat treating temperature, and rapidly cooling and naturally aging. The invention products have very good combinations of strength together with high fracture toughness or low fatigue crack growth rate, or both, making them well suited for aerospace applications such as fuselage skin. The products preferably include a corrosion protecting cladding of aluminum or aluminum alloy.
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Metals Handbook, vol. 2, "Properties and Selections: Nonferrous Alloys and Pure Metals", 9th Edition, 1979, pp. 50, 72-75, American Society for Metals, Metals Park, Ohio, US.
J. E. Hatch: "Aluminium", vol. 1, "Properties and Physical Metallurgy", 1st Edition, 1984, pp. 268-269, 361-365, 372-374, American Society for Metals, Metals Park, Ohio, US.
"Aluminum Alloy Development for Subsonic and Supersonic Aircraft", M. V. Hyatt, et al., Science and Engineering of Light Metals, published by The Japan Institute of Light Metals, Tokyo, Oct. 1991, pp. 273 to 280.
Colvin Edward L.
Magnusen Paul E.
Petit Jocelyn I.
Westerlund Robert W.
Aluminum Company of America
Dean R.
Koehler Robert R.
Lippert Carl R.
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