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Cu-Ni-Si alloys are widely used due to their good electrical conductivities in combination with high strength and hardness. In the present work, minor-alloying with M =(Cr, Fe, Mo, Zr) was conducted for the objective of further improving their hardness while maintaining their conductivity level. A cluster-plus-glue-atom model was introduced to design the compositions of M-alloyed Cu-Ni-Si alloys, in which an ideal composition formula[(Ni,Si,M)-Cu_(12)]Cu_3(molar proportion) was proposed. To guarantee the complete precipitation of solute elements in fine δ-Ni_2 Si precipitates, the atomic ratio of(Ni,M)/Si was set as 2/1. Thus the designed alloy series of Cu_(93.75)(Ni/Zr)_(3.75)Si_(2.08)(Cr/Fe/Mo)_(0.42)(at%) were arc-melted into ingots under argon atmosphere, and solidsolutioned at 950 ℃ for 1 h plus water quenching and then aged at 450 ℃ for different hours. The experimental results showed that these designed alloys exhibit high hardness(HV> 1.7 GPa) and good electrical conductivities(≥ 35% IACS). Specifically, the quinary Cu_(93.75)Ni_(3.54)Si_(2.08)(Cr/Fe)_(0.42)Zr_(0.21) alloys(Cu-3.32 Ni-0.93 Si-0.37(Cr/Fe)-0.30 Zr wt%) possess both a high hardness with HV = 2.5-2.7 GPa, comparable to the highstrength KLFA85 alloy(Cu-3.2 Ni-0.7 Si-1.1 Zn wt%,HV= 2.548 GPa),and a good electrical conductivity(35-36% IACS).
Cu-Ni-Si alloys are widely used due to their good electrical conductivities in combination with high strength and hardness. In the present work, minor-alloying with M = (Cr, Fe, Mo, Zr) was conducted for the objective of further A cluster-plus-glue-atom model was introduced to design the compositions of M-alloyed Cu-Ni-Si alloys, in which an ideal composition formula [(Ni, Si, M) - To guarantee the complete precipitation of solute elements in fine δ-Ni_2Si precipitates, the atomic ratio of (Ni, M) / Si was set as 2/1. Thus the designed alloy series of Cu_ (93.75) (Ni / Zr) _ (3.75) Si_ (2.08) (Cr / Fe / Mo) ______________________________________ (0.42) (at%) were arc-melted into ingots under argon atmosphere, for 1 h plus water quenching and then aged at 450 ° C for different hours. The experimental results showed that these designed alloys exhibit high hardness (HV> 1.7 GPa) and good electrical conducti (Cu-3.32 Ni-0.93 Si-0.37 (Cr) is the most common type of Cu (3.75) /Fe)-0.30Zrwt%) both of high hardness with HV = 2.5-2.7 GPa, comparable to the high strength KLFA85 alloy (Cu-3.2 Ni-0.7 Si-1.1 Zn wt%, HV = 2.548 GPa), and a good electrical conductivity (35-36% IACS).