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<p>Here, a novel lightweight Fe<sub>62</sub>Co<sub>5</sub>Ni<sub>10</sub>Cr<sub>13</sub>Si<sub>7</sub>Al<sub>2</sub>Mo<sub>1</sub> (at.%) medium-entropy alloy (MEA) with face-centered cubic (FCC) and body-centered cubic (BCC) dual-phase heterogeneous structure was fabricated, and the comprehensive examination of the mechanical characteristics was conducted. The experimental results suggested that the MEA demonstrates an outstanding combination of yield strength (~ 1.1&#xa0;GPa) and ductility (~ 44%) under ambient conditions, which surpasses the performance of the majority of documented ferrous MEAs and stainless steels. Moreover, the addition of Mo increases corrosiveness. Microstructural examination indicates that the superior mechanical properties can be attributed to multiple strengthening mechanisms, including transformation-induced plasticity, twinning-induced ductility, fine grain, precipitation, and heterogeneous deformation-induced (HDI) strengthening. This alloy design methodology establishes a foundational framework for the advancement of high-performance MEAs.</p>

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A Novel Lightweight Ferrous Medium-Entropy Alloy with High-Yield Strength–Ductility Synergy at Room Temperature

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Na Li,
  • Hai Gu,
  • Dongshuai Zhou,
  • Wei Deng,
  • Kewei Ren,
  • Xiwang Luo,
  • Xuening Dong

摘要

Here, a novel lightweight Fe62Co5Ni10Cr13Si7Al2Mo1 (at.%) medium-entropy alloy (MEA) with face-centered cubic (FCC) and body-centered cubic (BCC) dual-phase heterogeneous structure was fabricated, and the comprehensive examination of the mechanical characteristics was conducted. The experimental results suggested that the MEA demonstrates an outstanding combination of yield strength (~ 1.1 GPa) and ductility (~ 44%) under ambient conditions, which surpasses the performance of the majority of documented ferrous MEAs and stainless steels. Moreover, the addition of Mo increases corrosiveness. Microstructural examination indicates that the superior mechanical properties can be attributed to multiple strengthening mechanisms, including transformation-induced plasticity, twinning-induced ductility, fine grain, precipitation, and heterogeneous deformation-induced (HDI) strengthening. This alloy design methodology establishes a foundational framework for the advancement of high-performance MEAs.