Copper alloy having improved stress relaxation

Details Copper alloy having improved stress relaxation Copper alloy having improved stress relaxation

1997-07-22

1999-02-09

Sheehan, John

Metal treatment

Stock

Copper base

420496, 420499, C22C 900

Patent

active

058688773

ABSTRACT:
A copper alloy having improved resistance to stress relaxation contains controlled additions of iron, phosphorous and magnesium. Free magnesium, in solid solution with the copper, increases the alloy's resistance to stress relaxation. Copper alloys of the invention retain at least 70% of the initial stress following exposure to a temperature of 105.degree. C. for 3000 hours, making the alloys particularly useful for electrical connector components.

REFERENCES:
patent: 3677745 (1972-07-01), Finlay et al.
patent: 3778745 (1973-12-01), Finlay et al.
patent: 4202688 (1980-05-01), Crane et al.
patent: 4305762 (1981-12-01), Caron et al.
patent: 4605532 (1986-08-01), Knorr et al.
patent: 5334346 (1994-08-01), Kim et al.
ASM Handbook.RTM., vol. 2, "Properties and Selection: Nonferrous Alloys and Special-Purpose Materials" (Jan. 1992) pp. 260-263 (Stress-Relaxation Characteristics) and 295 (C19700).

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