Cast composite material having a matrix containing a stable oxid

Details Cast composite material having a matrix containing a stable oxid Cast composite material having a matrix containing a stable oxid

1989-08-07

1990-07-24

Sheehan, John P.

Stock material or miscellaneous articles

All metal or with adjacent metals

Laterally noncoextensive components

C22C 2100

Patent

active

049434900

ABSTRACT:
A cast composite material is prepared from a modified aluminum-containing matrix and reinforcement particles mixed into the matrix. From about 15 to about 130, preferably from about 20 to about 50, parts per million of an element, preferably beryllium, that forms a more stable oxide than magnesium oxide is included in the matrix alloy. The stable-oxide-forming element reduces the amount and thickness of the aluminum oxide and other oxides formed at the surface of the melt, which otherwise may be mixed into the melt to cause microstructural irregularities in the matrix of the cast composite material.

REFERENCES:
patent: 3985557 (1976-10-01), Sanders
patent: 4662429 (1987-05-01), Wada et al.
patent: 4759995 (1988-07-01), Skibo et al.
patent: 4786467 (1988-11-01), Skibo et al.
Metals Handbook, pub. by American Society for Metals, 9th edition, vol. 2, p. 167 (1979).
D. A. Granger et al., "Effect of Beryllium on the Properties of A357.0 Castings", Abstract of journal article published Trans. Am. Foundryman's Soc., 1984.
M. Conserva, "The Effect of Beryllium on Aging in Aluminum-Zinc-Magnesium Alloys", Abstract of article published in 1973 in Alluminio, vol. 41, pp. 484-487 (Termed Conserva I herein).
M. Conserva, "Effect of Beryllium on the Aging Process of an Alloy with 5 Percent Zn and 0.85 Percent Mg", Abstract of Translation from Aluminio, vol. 41, 1972 (Termed Conserva II herein).

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