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<p>Eutectic high-entropy alloy (EHEA) combines the advantages of eutectic alloys and high-entropy alloys, which display good tensile properties and castability. However, due to the high content of hard phases and significant mismatch, more EHEA systems exhibit shortcomings such as early fracture and poor machining ability. Thus, it is a key that adjusts the element ratio and phase ratio to improve the mechanical property of EHEAs. In this work, Al<sub>9</sub>Cr<sub>12</sub>Fe<sub>20</sub>V<sub>12</sub>Ni<sub>47</sub> EHEA reveals ultimate tensile strength and yield strength of 1403 ± 50&#xa0;MPa and 947 ± 20&#xa0;MPa, respectively. Meanwhile, Al<sub>9</sub>Cr<sub>12</sub>Fe<sub>20</sub>V<sub>12</sub>Ni<sub>47</sub> also maintained an elongation rate of nearly 20 ± 3%. The excellent strength and ductility of the Al<sub>9</sub>Cr<sub>12</sub>Fe<sub>20</sub>V<sub>12</sub>Ni<sub>47</sub> were mainly ascribed to combine soft FCC phase and hard acicular structure, indicating a significant hetero-deformation-induced (HDI) strengthening. This work opens up new possibilities for realizing high-strength and ductile metal parts with complex shapes by designing special eutectic weaving structures.</p>

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A New Type of Al9Cr12Fe20V12Ni47 Eutectic High Entropy Alloy with Dual Needle-Like Structure Achieving High Strength and Large Ductility

  • 期刊论文

  • 发表日期：

    2025年10月11日

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  • Junyan Yang,
  • Zenghong Li,
  • Lincai Zhang,
  • Mingzhe Zhang

摘要

Eutectic high-entropy alloy (EHEA) combines the advantages of eutectic alloys and high-entropy alloys, which display good tensile properties and castability. However, due to the high content of hard phases and significant mismatch, more EHEA systems exhibit shortcomings such as early fracture and poor machining ability. Thus, it is a key that adjusts the element ratio and phase ratio to improve the mechanical property of EHEAs. In this work, Al9Cr12Fe20V12Ni47 EHEA reveals ultimate tensile strength and yield strength of 1403 ± 50 MPa and 947 ± 20 MPa, respectively. Meanwhile, Al9Cr12Fe20V12Ni47 also maintained an elongation rate of nearly 20 ± 3%. The excellent strength and ductility of the Al9Cr12Fe20V12Ni47 were mainly ascribed to combine soft FCC phase and hard acicular structure, indicating a significant hetero-deformation-induced (HDI) strengthening. This work opens up new possibilities for realizing high-strength and ductile metal parts with complex shapes by designing special eutectic weaving structures.