The as-cast structure

solid solution and aging characteristics and structure changes of Cu-15 Ni-8 Sn alloy with Mg content of 0.05%～0.30% were investigated. The experimental results indicate that Mg is segregated in the Sn-rich phase at as-cast state

and significantly inhibits the discontinuous precipitation during the alloy aging process

thus improving the mechanical properties. When the ageing time is 6 h

with the increase of Mg content

the alloy hardness is increased and the electrical conductivity is decreased. The hardness and conductivity of the alloy with 0.3% Mg are 369 HV and 4.85 MS/m

respectively

which are increased by 11 HV and decreased by 0.26 MS/m compared with those of one without Mg.