Metal treatment – Compositions – Heat treating
Patent
1987-04-10
1989-03-28
Dean, R.
Metal treatment
Compositions
Heat treating
148 115A, 148 127A, 148415, 148416, 148417, 148418, 148437, 148438, 148439, 148440, C22F 104
Patent
active
048160873
ABSTRACT:
A method of producing a recrystallized aluminum-lithium product having improved levels of strength and fracture toughness is disclosed. The method comprises the steps of: providing a lithium-containing aluminum base alloy comprised of 0.5 to 4.0 wt. % Li, 0 to 5.0 wt. % Cu, 0 to 5.0 wt. % Mg, 0.10 to 1.0 wt. % of a grain structure control element selected from the class consisting of Zr, Cr, Hf, Ti, V, Sc, and Mn, 0.5 wt. % max. Fe, and 5 wt. % max. Si, with the balance consisting essentially of aluminum and incidental elements and impurities; heating the body to a high presoak temperature to homogenize the alloy; cooling the alloy to a first hot working temperature; reheating the alloy, after hot working, back to a high annealing temperature; cooling the alloy to a second hot working temperature to produce a first product; reheating the alloy to a lower annealing temperature; and then cold working the alloy. The cold worked product is solution heat treated, quenched and aged to provide a substantially dual mode recrystallized sheet product having improved levels of strength and fracture toughness and further characterized by a fine grain structure adjacent the surface of the alloy product and a coarse grain structure in the interior thereof.
REFERENCES:
patent: 1620081 (1927-03-01), Czochralski et al.
patent: 1620082 (1927-03-01), Czochralski
patent: 2381219 (1945-08-01), LeBaron
patent: 2915390 (1959-12-01), Criner
patent: 2915391 (1959-12-01), Criner
patent: 4094705 (1978-06-01), Sperry et al.
patent: 4409038 (1983-10-01), Weber
"Advanced Aluminum Metallic Materials and Processes for Application to Naval Aircraft Structures" by W. T. Highberger et al., 12th National SAMPE Technical Conference, Oct. 7-9, 1980.
"Alloying Additions and Property Modification in Al-Li--X Systems" by F. W. Gayle, Int'l. Al-Li Conference, Stone Mountain, Ga., May 19-21, 1980.
"Heat Treatment, Microstructure and Mechanical Property Correlations in Al-Li-Cu and Al-Li-Mg P/M Alloys" by G. Chanani et al., Society/AIME, Dallas, Tex., Feb. 17-18, 1982.
"Age Hardening Behavior of Al-Li-(Cu)-(Mg)-Zr P/M Alloys" by D. J. Chellman et al., Proceedings of 1982 Nat'l. P/M Conf.--P/M Products and Properties Session, Montreal, Canada, May 1982.
"Precipitation in Al-Li-Cu Alloys" by J. E. O'Neal et al., 39th Annual EMSA Meeting, Atlanta, Ga., Aug. 10-14, 1981.
"HVEM In Situ Deformation of Al-Li-X Alloys" by R. E. Crooks et al., Scripta Metallurgica, vol. 17, pp. 643-647, 1983.
"Developments in Structures and Manufacturing Techniques" by C. J. Peel et al., Aeronautical Journal, Sept. 1981.
"Aluminum-Lithium Alloys: New Materials for Tomorrow's Technology" by T. H. Sanders, Jr. et al., Foote Prints, vol. 44, No. 1, 1981.
"The Mechanical Properties of Aluminum-Lithium Alloy" by M. Y. Drtis et al., Splavy Tsvetnykh Metalloy, 1972, pp. 187-192.
"Factors Influencing Fracture Toughness and Other Properties of Aluminum-Lithium Alloys" by T. H. Sanders et al., Naval Air Dev. Center Contract No. N62269-76-C-0271 for Naval Air Systems Command.
Lockheed Report No. LM C-D766966, Sept. 1980, p. 10.
"Effect of Composition and Heat Treatment on Strength and Fracture Characteristics of Al-Li-Mg Alloys" by S. J. Harris, B. Noble and K. Dinsdale, Pub. 1984 Feb. according to information from AIME.
Alexander Andrew
Aluminum Company of America
Dean R.
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