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<p>Based on the CoCrFeMnNi high-entropy alloy with simple face-centered cubic structure (FCC) prepared by vacuum arc melting technology, (CoCrFeMnNi) 85Al6Ti4Cu5 HEA was prepared by adding Al, Ti and Cu elements. Copper mold suction casting, 1473 K sealing homogenization, 70% cold rolling + 923 K aging, water cooling and heat treatment process. The microstructure and phase composition of as-cast and heat-treated high-entropy alloys were systematically characterized by metallographic microscope, scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD) and transmission electron microscope (TEM). The microhardness of as-cast and heat-treated high-entropy alloys was tested by Vickers hardness tester. The effect of heat treatment process on the precipitation of the second phase of (CoCrFeMnNi) 85Al6Ti4Cu5 HEA was studied. The experimental results show that the second phase precipitated in the as-cast (CoCrFeMnNi) 85Al6Ti4Cu5 HEA is mainly AlTiNi2 phase with L21 structure. After homogenization, cold rolling, aging and other heat treatment processes, the amount of second phase precipitation gradually increases. The addition of Cu element has a solid solution strengthening effect on CoCrFeMnNi-based high-entropy alloy, and the as-cast microhardness of the alloy reaches 252.9 HV<sub>0.5</sub>. Combined with the heat treatment process, the alloy forms a FCC + BCC dual-phase structure. The research shows that the addition of Cu element promotes the precipitation of L21 phase. Under the combined effect of solid solution strengthening and second-phase strengthening, the hardness of the alloy after heat treatment reaches a maximum of 484.7 HV<sub>0.5</sub>. The addition of alloying elements has significantly improved the mechanical properties of high-entropy alloys.</p>

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Characterization of Precipitation Phase in a CoCrFeMnNi Based High-entropy Alloy

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Xianwei Gu,
  • Hongtao Li,
  • Hongen An

摘要

Based on the CoCrFeMnNi high-entropy alloy with simple face-centered cubic structure (FCC) prepared by vacuum arc melting technology, (CoCrFeMnNi) 85Al6Ti4Cu5 HEA was prepared by adding Al, Ti and Cu elements. Copper mold suction casting, 1473 K sealing homogenization, 70% cold rolling + 923 K aging, water cooling and heat treatment process. The microstructure and phase composition of as-cast and heat-treated high-entropy alloys were systematically characterized by metallographic microscope, scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD) and transmission electron microscope (TEM). The microhardness of as-cast and heat-treated high-entropy alloys was tested by Vickers hardness tester. The effect of heat treatment process on the precipitation of the second phase of (CoCrFeMnNi) 85Al6Ti4Cu5 HEA was studied. The experimental results show that the second phase precipitated in the as-cast (CoCrFeMnNi) 85Al6Ti4Cu5 HEA is mainly AlTiNi2 phase with L21 structure. After homogenization, cold rolling, aging and other heat treatment processes, the amount of second phase precipitation gradually increases. The addition of Cu element has a solid solution strengthening effect on CoCrFeMnNi-based high-entropy alloy, and the as-cast microhardness of the alloy reaches 252.9 HV0.5. Combined with the heat treatment process, the alloy forms a FCC + BCC dual-phase structure. The research shows that the addition of Cu element promotes the precipitation of L21 phase. Under the combined effect of solid solution strengthening and second-phase strengthening, the hardness of the alloy after heat treatment reaches a maximum of 484.7 HV0.5. The addition of alloying elements has significantly improved the mechanical properties of high-entropy alloys.