Aluminum-lithium alloy and method of investment casting an alumi

Details Aluminum-lithium alloy and method of investment casting an alumi Aluminum-lithium alloy and method of investment casting an alumi

1986-12-19

1989-06-27

Dean, R.

Alloys or metallic compositions

Aluminum base

Copper containing

148 3, 148159, 148417, 420535, C22C 2100

Patent

active

048428221

ABSTRACT:
Aluminum-lithium alloy and method of investment casting an aluminum-lithium alloy including the steps of providing an aluminum-lithium alloy melt having a composition consisting essentially of about 2.0 to about 2.8 w/o lithium, about 1.2 to about 1.8 w/o copper provided that the combined lithium and copper content does not exceed 4.0 w/o, about 0.8 to about 1.0 w/o magnesium, the balance essentially aluminum, adding an effective amount of a grain refining agent to the aluminum-lithium alloy melt investment casting the melt, solution heat treating the aluminum-lithium alloy investment casting for up to 30 hours at continuously increasing temperatures to within approximately 30.degree. to 40.degree. F. of the solidus temperature of said aluminum-lithium alloy, and aging the aluminum-lithium alloy investment casting at a temperature and for a time sufficient to optimize the .delta.' precipitate size.

REFERENCES:
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patent: 4094705 (1978-06-01), Sperry et al.
patent: 4164434 (1979-08-01), Fister, Jr. et al.
E. S. Balmuth and R. Schmidt, "A Perspective on the Development of Aluminum-Lithium Alloys," Aluminum-Lithium Alloys, AIME, 1981, pp. 70-84.
T. H. Sanders, Jr. and E. A. Starke, Jr., "Aluminum-Lithium Alloys: New Materials for Tomorrow's Technology," Rapid Solidification Technology: Source Book, American Society for Metals, Metals Park, Ohio, 1983, pp. 396-402.
A. P. Divecha and S. D. Karmarkar, "The Search for Al-Li Alloys," Advanced Materials and Processes Inc. Metal Progress, Oct., 1986, pp. 74-79.

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