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<p>Eutectic high-entropy alloys (EHEAs) have attracted significant attention due to excellent fluidity and superior mechanical properties. However, the development and application of EHEAs are constrained by the strength–ductility trade-off dilemma, similar to traditional high-entropy alloys. In the current study, Fe<sub>10</sub>Co<sub>20</sub>Cr<sub>10</sub>Ni<sub>40</sub>Al<sub>18</sub>W<sub>2</sub> (at%) EHEA was selected for controlled hot rolling to achieve phase-selective recrystallization (PSR), which broke through the trade-off between strength and ductility. Specifically, the yield strength, ultimate tensile strength, and elongation were increased from 662&#xa0;MPa, 1179&#xa0;MPa, and 12.6% to 1030&#xa0;MPa, 1662&#xa0;MPa, and 15.4%, respectively. PSR process eliminated the lamellar phase in the AC-EHEA, preventing premature failure inhibited by crack propagation at phase boundaries and synergistically enhancing strength and ductility. Meanwhile, the PSR process has also been proven to help improve wear resistance. Compared with the as-cast specimens, the coefficient of friction was decreased by 12.5%, the cross-sectional area of the abrasion scars was reduced by 39.8%, and the dominant wear mechanism transitioned from adhesive wear to abrasive wear.</p> Graphical abstract <p></p>

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Phase-selective recrystallization synergistically promotes strength–ductility–wear resistance in Fe10Co20Cr10Ni40Al18W2 eutectic high-entropy alloy

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Teng-Fei Kuai,
  • Ying-Dong Xie,
  • He-Juan Chen,
  • Zheng-Wu Yang,
  • Guo-Xiang Shen

摘要

Eutectic high-entropy alloys (EHEAs) have attracted significant attention due to excellent fluidity and superior mechanical properties. However, the development and application of EHEAs are constrained by the strength–ductility trade-off dilemma, similar to traditional high-entropy alloys. In the current study, Fe10Co20Cr10Ni40Al18W2 (at%) EHEA was selected for controlled hot rolling to achieve phase-selective recrystallization (PSR), which broke through the trade-off between strength and ductility. Specifically, the yield strength, ultimate tensile strength, and elongation were increased from 662 MPa, 1179 MPa, and 12.6% to 1030 MPa, 1662 MPa, and 15.4%, respectively. PSR process eliminated the lamellar phase in the AC-EHEA, preventing premature failure inhibited by crack propagation at phase boundaries and synergistically enhancing strength and ductility. Meanwhile, the PSR process has also been proven to help improve wear resistance. Compared with the as-cast specimens, the coefficient of friction was decreased by 12.5%, the cross-sectional area of the abrasion scars was reduced by 39.8%, and the dominant wear mechanism transitioned from adhesive wear to abrasive wear.

Graphical abstract