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<p>To clarify the effect of Y addition on the microstructure and properties of Cu-Ti-Ni alloy, the first-principles calculation was employed to investigate the influence of Y on the diffusion behavior of solute Ti and Ni elements in the Cu-Ti-Ni-Y alloy, and the microstructures and properties of as-cast and aged Cu-3Ti-3Ni alloys with varying Y contents were characterized and tested as well. The simulation indicates that the incorporation of Y significantly accelerates the diffusion of Ti and Ni elements, thereby promoting phase precipitation. The increased Y content results in a remarkable increase in the number of primary phases, which is consistent with the simulation. After solution treatment at 900&#xa0;°C for 4&#xa0;h and aging at 550&#xa0;°C for 7&#xa0;h, the electrical conductivity of Cu-3Ti-3Ni-0.07Y can reach 35.66%IACS, while the hardness value can maintain 310 HV, and the elastic modulus reaches up to 150.44&#xa0;GPa. The superior mechanical properties can be primarily attributed to the dispersed nano-sized β′-Cu<sub>4</sub>Ti phases during aging, whereas the enhanced electrical conductivity arises from the less solubility of Ti in the Cu matrix due to the formation of a large number of CuNiTi and Ni<sub><i>x</i></sub>Ti phases.</p>

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Simulation and Experimental Investigation of Cu-3Ti-3Ni Alloy with Addition of Yttrium

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Lei Wang,
  • Xianhui Wang,
  • Hongbo Zhang,
  • Zhen Li,
  • Bochen Zhang,
  • Yu Jin,
  • Yanru Qiu,
  • Weijia Ren

摘要

To clarify the effect of Y addition on the microstructure and properties of Cu-Ti-Ni alloy, the first-principles calculation was employed to investigate the influence of Y on the diffusion behavior of solute Ti and Ni elements in the Cu-Ti-Ni-Y alloy, and the microstructures and properties of as-cast and aged Cu-3Ti-3Ni alloys with varying Y contents were characterized and tested as well. The simulation indicates that the incorporation of Y significantly accelerates the diffusion of Ti and Ni elements, thereby promoting phase precipitation. The increased Y content results in a remarkable increase in the number of primary phases, which is consistent with the simulation. After solution treatment at 900 °C for 4 h and aging at 550 °C for 7 h, the electrical conductivity of Cu-3Ti-3Ni-0.07Y can reach 35.66%IACS, while the hardness value can maintain 310 HV, and the elastic modulus reaches up to 150.44 GPa. The superior mechanical properties can be primarily attributed to the dispersed nano-sized β′-Cu4Ti phases during aging, whereas the enhanced electrical conductivity arises from the less solubility of Ti in the Cu matrix due to the formation of a large number of CuNiTi and NixTi phases.