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<p>The potential of Cu as a key alloying element to modulate an exceptional strength–ductility synergy through the formation of Cu-rich precipitates is frequently underestimated. This study systematically investigates the aging effects on a carbon-doped CuFeMnNi high-entropy alloy (HEA) with high dislocation density. Results demonstrate that aging increases the degree of phase separation, promoting the precipitation, growth, and agglomeration of Cu-rich nanoparticles along shear bands. These coherent Cu-rich precipitates effectively pin dislocations, leading to substantial precipitation strengthening. By tailoring the aging duration (15 minutes-12 hours), the mechanical properties of the alloy are optimized. The alloy aged for 12 hours exhibits an excellent strength–ductility synergy, achieving a yield strength of 1045&#xa0;MPa, an ultimate tensile strength of 1250&#xa0;MPa, and an elongation of 11 %, which outperforms most reported Cu-based HEAs. This work demonstrates a practical phase engineering strategy for tailoring HEA properties.</p>

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Effect of Aging Treatment on Cu-Rich Precipitates and Mechanical Properties of a Carbon-Doped CuFeMnNi High-Entropy Alloy

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Cheng Yin,
  • Mengyuan He,
  • Jianhua Cao

摘要

The potential of Cu as a key alloying element to modulate an exceptional strength–ductility synergy through the formation of Cu-rich precipitates is frequently underestimated. This study systematically investigates the aging effects on a carbon-doped CuFeMnNi high-entropy alloy (HEA) with high dislocation density. Results demonstrate that aging increases the degree of phase separation, promoting the precipitation, growth, and agglomeration of Cu-rich nanoparticles along shear bands. These coherent Cu-rich precipitates effectively pin dislocations, leading to substantial precipitation strengthening. By tailoring the aging duration (15 minutes-12 hours), the mechanical properties of the alloy are optimized. The alloy aged for 12 hours exhibits an excellent strength–ductility synergy, achieving a yield strength of 1045 MPa, an ultimate tensile strength of 1250 MPa, and an elongation of 11 %, which outperforms most reported Cu-based HEAs. This work demonstrates a practical phase engineering strategy for tailoring HEA properties.