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 particulary useful for electrical connector components.

 
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