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<p>High-entropy alloy powders Al<sub>x</sub>CoCrFeMnTi<sub>1–x</sub> (<i>x</i> = 0, 0.25, 0.5, 1) were synthesized by 96&#xa0;h mechanical alloying to study the influence of Al content on phase structure, microstructure, and magnetic properties. Single-phase BCC structures appeared at <i>x</i> = 0.25 and 0.5, while dual-phase BCC<sub>1</sub> + BCC<sub>2</sub> structures formed at <i>x</i> = 0 and 1.0. Microstructural examination showed refined, equiaxed particles with homogeneous elemental distribution. Higher Al content reduced mean particle size and improved morphology due to increased ductility and fragmentation efficiency. Vibrating sample magnetometry revealed that Al-rich alloys had higher saturation magnetization and lower coercivity, indicating a transition toward semi-hard magnetic behavior. The AlCoCrFeMn (<i>x</i> = 1) alloy achieved the best magnetic performance (<i>M</i><sub><i>s</i></sub> = 26.3&#xa0;emu/g, <i>H</i><sub><i>c</i></sub> = 100 Oe). These results demonstrate the potential of Al–Ti substitution to tailor HEA properties for advanced structural and magnetic applications.</p>

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Microstructure, Phase Stability, and Magnetic Properties of AlxCoCrFeMnTi1–x High-Entropy Alloys Synthesized via Mechanical Alloying

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • S. Ahmadpour,
  • R. Dehmolaei,
  • M. Reihanian,
  • Khalil Ranjbar

摘要

High-entropy alloy powders AlxCoCrFeMnTi1–x (x = 0, 0.25, 0.5, 1) were synthesized by 96 h mechanical alloying to study the influence of Al content on phase structure, microstructure, and magnetic properties. Single-phase BCC structures appeared at x = 0.25 and 0.5, while dual-phase BCC1 + BCC2 structures formed at x = 0 and 1.0. Microstructural examination showed refined, equiaxed particles with homogeneous elemental distribution. Higher Al content reduced mean particle size and improved morphology due to increased ductility and fragmentation efficiency. Vibrating sample magnetometry revealed that Al-rich alloys had higher saturation magnetization and lower coercivity, indicating a transition toward semi-hard magnetic behavior. The AlCoCrFeMn (x = 1) alloy achieved the best magnetic performance (Ms = 26.3 emu/g, Hc = 100 Oe). These results demonstrate the potential of Al–Ti substitution to tailor HEA properties for advanced structural and magnetic applications.