Properties and precipitates of the high strength and electrical conductivity Cu-Ni-Co-Si-Cr alloy

•The (Ni, Co)2Si and Cr nano precipitates uniformly distributed in the alloy provide good strength and conductivity.•Excellent ductility is provided because the small lattice mismatch strain between the precipitates and the Cu matrix.•The introduction of deformation twins improves the strength and ductility of the alloy.