The effects of addition of 0.1 massMg and 0.1 massFe on the strength and stress relaxation property of a precipitation hardenable Cu 0.52 massNi 0.19 massP alloy aged at 450°C have been investigated. Precipitation of Ni 2 P, Ni 12 P 5 , both Ni 2 P and Ni 5 P 4 , and both Ni 12 P 5 and Ni 5 P 4 phases was observed to occur on aging the Cu Ni P, Cu Ni P Fe, Cu Ni P Mg, and Cu Ni P Fe Mg alloys, respectively. The needle like Ni 5 P 4 phase was first found to be precipitated in the Cu matrix. In the peak aging stage, the yield strength of the four alloys is controlled by the Orowan mechanism. The addition of Mg to the Cu Ni P alloy enhanced the strength of the alloy, but the Fe addition did not significantly affect the strength. The strength of the Cu Ni P Mg alloy was nearly identical to that of the Cu Ni P Fe Mg alloy. The increase in strength by the addition of Mg is ascribed to the decrease in inter precipitate spacing of precipitates. The Cu Ni P Fe alloy exhibited better stress relaxation property than the Cu Ni P alloy, probably because atoms caused by pairs of Fe and P chemical bonding are dragged by moving dislocations. Adding Mg to the Cu Ni P alloys did not essentially change the stress relaxation property. This may be as a result of the combination of the increase in stress relaxation resistance caused by the Mg atom drag effect on dislocation motion and of the decrease in that due to the decrease in the amount of P atoms in the Cu matrix by adding Mg. (Received November 5, 2009; Accepted February 9, 2010) Keywords: copper nickel phosphorus alloy, alloying element addition, Ni 2 P precipitate, Ni 12 P 5 precipitate, Ni 5 P 4 precipitate, precipitation strengthening, stress relaxation property
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