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<p>This study investigates the influence of aging treatment and thermo-mechanical processing on the microstructure and properties of the Cu-3.56Ni-1.12Co-1.28Si alloy, designed for high strength and conductivity. The alloy was prepared via vacuum induction melting, hot rolling, and solution treatment, followed by two distinct processing routes: one-step cold rolling and aging (Process I) and two-step cold rolling with intermediate aging (Process II). Solution treatment yielded equiaxed grains containing micron-scale Ni<sub>2</sub>Si precipitates. During thermo-mechanical processing, these coarse precipitates were replaced by nanoscale δ-Ni<sub>2</sub>Si phases and dense dislocation networks. The refined microstructure resulted in substantial improvements in both strength and conductivity. Process II, incorporating pre-aging and intermediate cold rolling, achieved superior performance, with peak hardness (265 HV, Process II), yield strength (819.32&#xa0;MPa), and electrical conductivity (45.5% IACS) after aging at 450&#xa0;°C for 100&#xa0;min. Texture analysis demonstrated that cross-rolling (CRIII) increased Brass texture content (&gt;30%) and refined grain structure, mitigating anisotropy and improving both strength and conductivity. Transmission electron microscopy confirmed the orientation relationship between δ-Ni<sub>2</sub>Si precipitates and the Cu matrix, highlighting the synergistic effects of precipitation strengthening, dislocation hardening, and grain refinement. These findings underscore the efficacy of tailored thermo-mechanical processing in optimizing the performance of Cu-Ni-Co-Si alloys for advanced engineering applications.</p>

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Effect of Aging Treatment on the Microstructure and Properties of Cu-Ni-Co-Si Alloys

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Meilong Feng,
  • Jieqi Zhang,
  • Haijun Shao,
  • Chunxiang Yuan,
  • Pengfei Zhang

摘要

This study investigates the influence of aging treatment and thermo-mechanical processing on the microstructure and properties of the Cu-3.56Ni-1.12Co-1.28Si alloy, designed for high strength and conductivity. The alloy was prepared via vacuum induction melting, hot rolling, and solution treatment, followed by two distinct processing routes: one-step cold rolling and aging (Process I) and two-step cold rolling with intermediate aging (Process II). Solution treatment yielded equiaxed grains containing micron-scale Ni2Si precipitates. During thermo-mechanical processing, these coarse precipitates were replaced by nanoscale δ-Ni2Si phases and dense dislocation networks. The refined microstructure resulted in substantial improvements in both strength and conductivity. Process II, incorporating pre-aging and intermediate cold rolling, achieved superior performance, with peak hardness (265 HV, Process II), yield strength (819.32 MPa), and electrical conductivity (45.5% IACS) after aging at 450 °C for 100 min. Texture analysis demonstrated that cross-rolling (CRIII) increased Brass texture content (>30%) and refined grain structure, mitigating anisotropy and improving both strength and conductivity. Transmission electron microscopy confirmed the orientation relationship between δ-Ni2Si precipitates and the Cu matrix, highlighting the synergistic effects of precipitation strengthening, dislocation hardening, and grain refinement. These findings underscore the efficacy of tailored thermo-mechanical processing in optimizing the performance of Cu-Ni-Co-Si alloys for advanced engineering applications.