Superplastic aluminum alloy and process for producing same

Details Superplastic aluminum alloy and process for producing same Superplastic aluminum alloy and process for producing same

1994-01-25

2000-05-02

Wyszomierski, George

Metal treatment

Stock

Age or precipitation hardened or strengthened

148417, 148418, 420532, 420533, 420541, 420542, 420543, 420902, C22C 2106

Patent

active

060568356

ABSTRACT:
The present invention relates to a process for producing a superplastic aluminum alloy capable of being used for plastic working such as extrusion, forging and rolling. An object of the present invention is to provide an ingot-made high speed superplastic aluminum alloy in which superplasticity is developed at a strain rate higher than that of conventional static recrystallization type superplastic aluminum alloys, and a process for producing the same. The superplastic aluminum alloy of the invention has structure which is obtained by adding to a basic alloy containing from at least 4.0 to 15% by weight of Mg and from 0.1 to 1.0% by weight of one or more elements selected from the group consisting of Mm, Zr, V, W, Ti, Ni, Nb, Ca, Co, Mo and Ta, and further selective elements of Sc, Cu. Li, Sn, In and Cd, which contains from 0.1 to 4.0% by volume fraction of spheroidal precipitates of intermetallic compounds having a particle size from 10 to 200 nm, and which has a mean grain size from 0.1 to 10 .mu.m.

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patent: 5122196 (1992-06-01), Fernandez
"Basis and Industrial Technology for Aluminum Materials", Table 1, p. 387, Japan Light Metal Association (1985).
"Superplasticity in Commercial Aluminum Alloys", K. Higashi, pp. 751-764, Journal of Japan Institute of Light Metals, vol. 39, No. 11(1989).
"Superplasticity in a Thermomechanically Processed High-Mg, Al-Mg Alloy", T.R. McNelley, E.-W. Lee, and M.E. Mills, pp. 1035-1041, Metallurgical Transactions, vol. 17A, Jun. 1986.
"The Influence of Thermomechanical Processing Variables on Superplasticity in a High-Mg, Al-Mg Alloy", E.-W. Lee, T.R. McNelley, and A.F. Stengel, pp. 1043-1050, Metallurgical Transactions, vol. 17A, Jun. 1986.

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