Gold-colored copper-aluminum-indium alloy

Details Gold-colored copper-aluminum-indium alloy Gold-colored copper-aluminum-indium alloy

1993-01-04

1997-02-04

Yee, Deborah

Metal treatment

Stock

Copper base

420489, C22C 900, C22C 901

Patent

active

055994067

ABSTRACT:
A copper-aluminum-indium alloy approaches gold in spectral appearance, tarnish resistance and mechanical durability, by virtue of a specific formulation and microstructure. The formulation consists of the following essential ingredients by total weight, in a copper matrix: from 7 to 12% of aluminum, from 5 to 11% of indium, and no more than 3% of a essentially non-ferromagnetic remainder. The required microstructure is in the form an essentially ternary alloy having a quenched single phase, an average grain size of no more than 100 .mu.m in diameter. Preferably, the above specified 3% remainder includes: a modifier selected from the class consisting of boron, silicon, lithium, magnesium, zinc and phosphorous; a strengthener selected from the class consisting of silver, gold, palladium, platinum, iridium, ruthenium and rhodium; and a system stabilizer, preferably selected from the class consisting of yttrium, cerium, lanthanum, hafnium, zirconium, chromium, titanium, nickel, iron and manganese.

REFERENCES:
patent: 1960740 (1934-05-01), Gray et al.
patent: 3998633 (1976-12-01), Rhodes
Stirling, P. H., The Copper Rich Alloys of the System Copper-Aluminum-Indium, Journal of the Institute of Metals, vol. 84, 1955.

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