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<p>A dual-phase composite of the two different high-entropy alloys (CoCrFeNi and AlCoCrFeNi HEAs) with no any contaminants was prepared by spark plasma sintering for the first time. The effects of AlCoCrFeNi HEA on microstructure and mechanical properties of CoCrFeNi-<i>x</i>AlCoCrFeNi (<i>x</i> = 0, 10, 20, 30% wt.%) composites were investigated. The results show that the micro-sized BCC phase distributes homogeneously within the FCC matrix in HEA composites, and refines the average grain size of FCC phase. As the content of AlCoCrFeNi HEA increases, the yield strength and ultimate tensile strength of composites increase gradually, while the elongation decreases. CoCrFeNi-30%AlCoCrFeNi HEA composite owns the highest yield strength of 522&#xa0;MPa (± 10.8) and ultimate tensile strength of 857&#xa0;MPa (± 13.6), with an adequate elongation of 27.3% (± 3.2%). The fraction of low-angle grain boundaries significantly increase while that of annealing twins decreases after tension, and a {111}  &lt;111&gt;  texture is formed in all fractured composites. The fracture mechanism transforms from ductile fracture in CoCrFeNi alloy to brittle-ductile fracture in CoCrFeNi-30%AlCoCrFeNi composite. This study provides a reference for the development of HEA composites.</p>

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Microstructure and Mechanical Properties of Dual-Phase Composite of High-Entropy Alloys Fabricated by Spark Plasma Sintering

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Jieming Chen,
  • Lei Xiao,
  • Nan Wang,
  • Shifeng Luo,
  • Shi Huang,
  • Xiao Yang

摘要

A dual-phase composite of the two different high-entropy alloys (CoCrFeNi and AlCoCrFeNi HEAs) with no any contaminants was prepared by spark plasma sintering for the first time. The effects of AlCoCrFeNi HEA on microstructure and mechanical properties of CoCrFeNi-xAlCoCrFeNi (x = 0, 10, 20, 30% wt.%) composites were investigated. The results show that the micro-sized BCC phase distributes homogeneously within the FCC matrix in HEA composites, and refines the average grain size of FCC phase. As the content of AlCoCrFeNi HEA increases, the yield strength and ultimate tensile strength of composites increase gradually, while the elongation decreases. CoCrFeNi-30%AlCoCrFeNi HEA composite owns the highest yield strength of 522 MPa (± 10.8) and ultimate tensile strength of 857 MPa (± 13.6), with an adequate elongation of 27.3% (± 3.2%). The fraction of low-angle grain boundaries significantly increase while that of annealing twins decreases after tension, and a {111}  <111>  texture is formed in all fractured composites. The fracture mechanism transforms from ductile fracture in CoCrFeNi alloy to brittle-ductile fracture in CoCrFeNi-30%AlCoCrFeNi composite. This study provides a reference for the development of HEA composites.