Abstract:Cu-Cr-Zr and Cu-Ni-Si alloys are excellent leadframe materials, but each has its own performance limitations. Cu-Cr-Zr alloy exhibits excellent electrical conductivity but relatively low strength. Cu-Ni-Si alloy exhibits exceptionally high strength but general electrical conductivity. If the advantages of both can be combined and their structures can be regulated through subsequent processes, it exhibits a new path to prepare high-strength and high-conductivity copper alloys. The experiment utilized vacuum induction melting to prepare Cu-0.746Cr-0.217Zr-0.605Ni-0.109Si-0.177Co-0.085Zn (%, mass fraction) alloy. The solution treatment was carried out under different process conditions, and the evolution of electrical conductivity and hardness of the alloy during aging process under different solution treatment conditions was studied. The results showed that after solution treatment at 1010 ℃ for 1.5 h, the aging process at 500 ℃ for 3 h achieved excellent comprehensive performance. In addition, the aging precipitation process of the alloy was described according to the Avrami empirical equation. The results showed that the precipitation rate of the alloys with different solution treatment increases with the increase of aging temperature during the aging process.