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Abstract <p>AlCoCrFeMg<sub><i>x</i></sub> high-entropy alloys were prepared through mechanical alloying along with subsequent hot pressing, and further, the microstructure and corrosion resistance of the alloys were comprehensively assessed using optical microscopy (OM), electrochemical measurements, and X-ray diffraction (XRD). The corrosion behaviour was probed in 3.5 wt % NaCl. Among the compositions investigated, AlCoCrFeMg<sub>0.8</sub> had the lowest corrosion rate (CR), as reflected by its elevated polarization resistance (<i>R</i><sub>p</sub> = 8.73&#xa0;Ohm cm<sup>2</sup>), charge transfer resistance (530.9 Ohm cm<sup>2</sup>), and the lowest double layer capacitance (0.88 × 10<sup>–5</sup> Ohm<sup>–1</sup> cm<sup>–2</sup> S, while AlCoCrFeMg<sub>0.2</sub> exhibited the highest corrosion rate with a significantly lower polarization resistance (<i>R</i><sub>p</sub> = 1.26 Ohm cm<sup>2</sup>), charge transfer resistance (105.4 Ohm cm<sup>2</sup>), and the double layer capacitance (9.38 × 10<sup>–5</sup> Ohm<sup>–1</sup> cm<sup>–2</sup> S). These findings reflect the role of magnesium content in the corrosion behaviour of AlCoCrFeMg<sub><i>x</i></sub> high-entropy alloys.</p>

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Corrosion Behaviour of AlCoCrFeMgx High Entropy Alloy Synthesized Using Mechanical Alloying and Hot Pressing

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • R. K. Saini,
  • U. Pandel,
  • Vijay N. Nadakuduru

摘要

Abstract

AlCoCrFeMgx high-entropy alloys were prepared through mechanical alloying along with subsequent hot pressing, and further, the microstructure and corrosion resistance of the alloys were comprehensively assessed using optical microscopy (OM), electrochemical measurements, and X-ray diffraction (XRD). The corrosion behaviour was probed in 3.5 wt % NaCl. Among the compositions investigated, AlCoCrFeMg0.8 had the lowest corrosion rate (CR), as reflected by its elevated polarization resistance (Rp = 8.73 Ohm cm2), charge transfer resistance (530.9 Ohm cm2), and the lowest double layer capacitance (0.88 × 10–5 Ohm–1 cm–2 S, while AlCoCrFeMg0.2 exhibited the highest corrosion rate with a significantly lower polarization resistance (Rp = 1.26 Ohm cm2), charge transfer resistance (105.4 Ohm cm2), and the double layer capacitance (9.38 × 10–5 Ohm–1 cm–2 S). These findings reflect the role of magnesium content in the corrosion behaviour of AlCoCrFeMgx high-entropy alloys.