Cu-Ni-Si-Fe-P alloy was prepared by adding a small amount of Fe and P elements into the CuNi-Si alloy.Effects of heat treatment on the electrical conductivity

hardness and microstructure evolution of the Cu-1.7Ni-0.5Si-0.27Fe-0.03 Palloy were investigated by hardness tester

EDS

XRD and SEM.The results show that with the increase of solution temperature

the dendritic precipitates in the alloy are dissolved gradually

and the precipitates are dissolved fully in the matrix after 850 ℃×1hsolution treatment.Hardness of the alloy is declined rapidly with the increase of solution temperature to107.39 HV

and conductivity of the alloy is decreased slightly to 12.75 MS/m.After aging treatment

the conductivity and hardness of the alloy are improved greatly.After 850 ℃×1hsolution treatment and 500 ℃×3haging treatment

the hardness

electric conductivity and soften temperature of the alloy reach 208.10 HV

23.78 MS/m

568.7 ℃

respectively.At initial stage of aging treatment

the NiSiFeP particle compounds are precipitated

and the compounds are decomposed to form FeP and NiSi compounds with the smaller size at the later stage of aging treatment.