Cu-based Cu-2.8Ni-0.7Si alloy ribbons with 50

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50μm in thickness and smooth surface were prepared by single roller spinning quenching method.The ribbons prepared were heat treated at 400

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00 ℃for varied time.Effects of the temperature and aging time on the electrical conductivity and tensile strength of the ribbons were investigated.The results reveal that electrical conductivity of the ribbons is increased gradually while tensile strength is increased firstly and then decreased with the aging time increase at the fixed temperature

and the tensile strength after peak aging is increased with the increase of aging temperature.The electrical conductivity of the ribbons is increased linearly with the contents ofδ-Ni

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Si as the precipitation phase.Dynamics of theδ-Ni

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Si phase formation was estimated by the Avrami equation

and electric conductivity equation of precipitatingδ-Ni

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Si phase from the Cu alloy ribbons was determined.In addition

the dynamic curves of the relations between precipitation and aging times were calculated.