The evolution of microstructure and properties of the Cu-5Fe alloy after cryogenic rolling(CR)and aging was studied by means of SEM,XRD,TEM,mechanical properties and electrical conductivity tests.The results show that when the deformation is 90％,the dislocation density of the alloy after CR is higher than that of room temperature rolling(RTR),and the refinement of Cu matrix grains and Fe phases is more significant.When the aging temperature is 500 ℃,the nano-Fe phase precipitates in the CR specimen is finer and more.This is because the higher deformation energy storage and dislocation density in the CR specimen promote the precipitation of Fe phase more effectively.After 90％deformation CR and aging at 500 ℃ for 1 h the tensile strength and electrical conductivity of the Cu-5Fe alloy are 551.5 MPa and 69％IACS,respectively.The comprehensive performance is better than that of the alloy after RTR process combined with aging treatment.This is due to the fact that the recrystallized grains of the CR specimen are still smaller than those of the RTR specimen,meanwhile,more nano-Fe phases in the CR specimen bring stronger precipitation strengthening effect and less influence on the conductivity of the alloy.
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