Metal treatment – Stock – Age or precipitation hardened or strengthened
Patent
1987-07-20
1992-07-28
Dean, R.
Metal treatment
Stock
Age or precipitation hardened or strengthened
148439, 148694, 148552, C22F 104
Patent
active
RE0340081
ABSTRACT:
A 7000 series aluminum alloy characterized by high strength, high fatigue resistance and high fracture toughness consists essentially of 5.9 to 6.9% zinc, 2.0 to 2.7% magnesium, 1.9 to 2.5% copper, 0.08 to 0.15% zirconium, a maximum of 0.15% iron, maximum of 0.12% silicon, a maximum of 0.06% titanium, a maximum of 0.04% chromium, a maximum of 0.05% for each of any other trace elements present in the alloy, the total of the other trace elements in the allow being a maximum of 0.15%, the balance of the alloy being aluminum. The foregoing alloy is hot worked to provide a wrought product, such as an extruded or plate product, in which recrystallization is held to a minimum. The wrought product is subjected to a solution treatment, quench, and elevated temperature aging cycle, normally until the product is at or near its maximum strength.
REFERENCES:
patent: 3881966 (1975-05-01), Staley et al.
Staley et al., "Further Development of Aluminum Alloy X7050, Final Report," Naval Air Systems Command Contract N00019-71-C0131, May 8, 1972 (Navy Report III).
Lin, Fu-Shiong, "Low Cicyle Corrosion Fatigue and Corrosion Fatigue Crack Propagation of High Strength 7000-Type Aluminum Alloys", Georgia Institute of Technology, May, 1978.
Starke, E. A., "Aluminum Alloys of the 70's: Scientific Solutions to Engineering Problems. An Invited Review", 29 Materials Science and Engineering 99-115 (1977).
Sanders, Jr. et al, The Effect of Intermediate Thermomechanical Treatments on the Fatigue Properties of a 7050 Aluminum Alloy, Metallurgical Transactions A, Vol. 9A, Aug. 1978, pp. 1087-1100.
"Synthesis of High-Strength Aluminum Alloys," Technical Report AFML-TR-74-129, Part 1, dated Dec. 1974, and prepared for the Air Force Materials Laboratory, Wright Patterson Air Force Base, by Battelle Columbus Laboratories and the Reynolds Metal Company.
Thompson, David S., "Metallurgical Factors Affecting High Strength Aluminum Alloy Production", Apr. 1975.
Staley, J. T., "Microstructure and Toughness of High-Strength Aluminum Alloys", Properties Related To Fracture Toughness. ASTM STP 605. American Society For Testing and Materials, 1976, pp. 71-103.
Hyatt Michael V.
Quist William E.
Dean R.
Phipps Margery S.
The Boeing Company
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