Process for making aluminum-lithium alloys of high toughness

Details Process for making aluminum-lithium alloys of high toughness Process for making aluminum-lithium alloys of high toughness

1991-10-04

1994-06-14

Andrews, Melvyn J.

Alloys or metallic compositions

Aluminum base

75678, 75686, 420533, 420543, C22C 102

Patent

active

053208030

ABSTRACT:
The toughness of Al-Li, Al-Mg and Mg-Li alloys is increased by a melting and refining process designed to reduce the concentration of alkali metal impurities below specified levels. The hydrogen and chlorine gas constituents are also significantly reduced.

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patent: 5032359 (1991-07-01), Pickens et al.
patent: 5085830 (1992-02-01), Webster
Frost, P. D., Jackson, J. H., Loonam, A. C., and Lorig, C. H. "The Effect of Sodium Contamination on Magnesium-Lithium Base Alloys," Transactions AIME, Journal of Metals, vol. 188, pp. 1171-1172, Sep. 1950.
Webster, "The Effect of Low Melting Point Impurities on the Properties of Aluminum-Lithium Alloys," Metallurgical Transactions A, vol. 18A, pp. 2181-2193, Dec. 1987.
Kojima et al., "Microstructural Characterization and Mechanical Properties of a Spray-Cast Al-Li-Cu-Mg-Zr Alloy," Proceeding of the 5th International Aluminum-Lithium Conference, Williamsburg, pp. 85-91 (Mar. 27-31, 1989).
Fager et al., "A Preliminary Report on Cleavage Fracture in Al-Li Alloys," Scripta Metallurgica, vol. 20, pp. 1159-1164 (1986).
Miller et al., "Sodium Induced Cleavage Fracture in High Strength Aluminum Alloys," Scripta Metallurgica, vol. 21, pp. 663-668 (1987).
Metals Handbook, vol. 15 Casting, 9th ed. pp. 84-85, 460-463, 746-749.
Hownmet, TSIR # 1781 (dated Mar. 17, 1987).

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