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<p>Eutectic high and medium entropy alloys (EH/MEAs) are promising candidates for next-generation marine propellers due to their high impact toughness and corrosion resistance. This study investigates the tensile properties, impact toughness (at 298&#xa0;K and 77&#xa0;K), fracture behavior, and seawater corrosion resistance of as-cast AlCrFe<sub>1.5</sub>Ni<sub>2.6</sub> EMEA. Microstructural and fractographic analyses reveal the origin of its temperature-dependent impact performance—providing critical data for marine applications. The results indicate that the alloy maintains high strength and ductility while exhibiting excellent impact toughness (42.85&#xa0;J/cm<sup>2</sup>) at 298&#xa0;K. At 77&#xa0;K, the alloy shows a substantial increase in strength with a slight improvement in ductility, but suffers a sharp decline in impact toughness (13.9&#xa0;J/cm<sup>2</sup>). The transition in the microscopic fracture mechanism from ductile-dominant to cleavage explains the decreased impact toughness. Furthermore, this work shows that the alloy also has excellent corrosion resistance in artificial seawater solution. This research supports the practical application of EMEAs.</p>

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Tensile Properties, Impact Toughness, and Corrosion Behavior of AlCrFe1.5Ni2.6 As-Cast Eutectic Medium Entropy Alloys at 298 K and 77 K

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Xuejun Lv,
  • Qian Ma,
  • Jinyuan Zhang,
  • Jiajia Niu,
  • Suo Zhang,
  • Yimeng Qin,
  • Ran Wei

摘要

Eutectic high and medium entropy alloys (EH/MEAs) are promising candidates for next-generation marine propellers due to their high impact toughness and corrosion resistance. This study investigates the tensile properties, impact toughness (at 298 K and 77 K), fracture behavior, and seawater corrosion resistance of as-cast AlCrFe1.5Ni2.6 EMEA. Microstructural and fractographic analyses reveal the origin of its temperature-dependent impact performance—providing critical data for marine applications. The results indicate that the alloy maintains high strength and ductility while exhibiting excellent impact toughness (42.85 J/cm2) at 298 K. At 77 K, the alloy shows a substantial increase in strength with a slight improvement in ductility, but suffers a sharp decline in impact toughness (13.9 J/cm2). The transition in the microscopic fracture mechanism from ductile-dominant to cleavage explains the decreased impact toughness. Furthermore, this work shows that the alloy also has excellent corrosion resistance in artificial seawater solution. This research supports the practical application of EMEAs.