Research on the Optimization of Ni/Si Atomic Ratio for Cu-Ni-Si Alloys with High Strength and High Electrical Conductivity

Lei Jia; Hui Xie; Zhen Lin Lu; Xiao Wang; Ya Ling Zhao

doi:10.4028/www.scientific.net/MSF.695.344

Paper Titles

Preparation of Ca-α-Sialon-SiC Multiphase Ceramics from Gasification Slag
p.328

Rubber Blend of 80/20 NR/SBR Reinforced with Nanosilica and PS-Encapsulated Nanosilica
p.332

Electrochemical Synthesis of Sensitive Layer of Polyaniline/Multi Wall Carbon Nanotube Composite
p.336

A Homogeneous Solidification Criterion for Undercooled Ni-20at%Pb Hypermonotectic Melts
p.340

Research on the Optimization of Ni/Si Atomic Ratio for Cu-Ni-Si Alloys with High Strength and High Electrical Conductivity
p.344

Oxidation Behavior of As-Forged Fe-25wt%Cr Alloys at 1100°C in Air
p.348

Hydrogen Variation in Molten Steel during LF Refining
p.353

Microstructure and Magnetic Properties of Undercooled Fe-50at%Ni Alloys
p.357

Artificial Neural Network to Predict the Hot Deformation Behavior of Super 13Cr Martensitic Stainless Steel
p.361

HomeMaterials Science ForumMaterials Science Forum Vol. 695Research on the Optimization of Ni/Si Atomic Ratio...

Research on the Optimization of Ni/Si Atomic Ratio for Cu-Ni-Si Alloys with High Strength and High Electrical Conductivity

Abstract:

Two sets of Cu-Ni-Si alloys with different Cu contents and Ni/Si atomic ratios were fabricated under the state of near-equilibrium solidification. The microstructures were observed by SEM and phase compositions were identified by XRD. The electrical conductivity and hardness were tested by Eddy-Conductivity Apparatus (ECA) and Digital Rockwell Hardmeter, respectively. The experimental results show that all the researched Cu-Ni-Si alloys are consisted of three phases, i.e. α-Cu(Ni,Si), Ni₃Si and δ-Ni₂Si. With the increase of Ni/Si atomic ratio, the amount of Ni₃Si decreases persistently but that of δ-Ni₂Si and electrical conductivity increases firstly and then decreases, the hardness decreases firstly and then increases following by a decrease finally. Both the electrical conductivity and hardness reach a relativity highest value when the Ni/Si atomic ratios are 2.6:1 and 2.4:1 for Cu-Ni-Si alloys with 95wt.% and 90wt.% Cu content respectively.