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<p>Equiatomic FeNiMnSi, FeNiMnCr, and FeNiMnSiCr alloys were fabricated using the powder metallurgy technique. Thermodynamic calculations classified FeNiMnSi and FeNiMnCr as medium-entropy alloys, while FeNiMnSiCr was identified as a high-entropy alloy (HEA). Among these, FeNiMnSiCr exhibited the highest relative density and the most favorable thermodynamic stability (Ω = 5.57, ∆<i>S</i><sub>mix</sub> = 13.38 kJ/mol&#xa0;K). X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy confirmed a multiphase microstructure with well-dispersed elements. Mechanical testing revealed that FeNiMnSi and FeNiMnSiCr exhibited higher hardness compared with FeNiMnCr. In corrosion studies, FeNiMnSiCr demonstrated the lowest corrosion rates of 0.41 mm/y in 1 M HCl, 0.11 mm/y in 1 M HNO<sub>3</sub>, and 0.46 mm/y in 1 M H<sub>2</sub>SO<sub>4</sub>, confirming its superior chemical resistance. Surface examinations further revealed reduced micro-galvanic attack compared with FeNiMnSi and FeNiMnCr. Overall, these results highlight FeNiMnSiCr as a promising HEA with a balanced combination of mechanical strength and corrosion resistance.</p>

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Impact of Si and/or Cr on the characteristics of FeNiMn-based alloys produced by powder metallurgy

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Shimaa A. Abolkassem,
  • Aliaa Abdelfatah,
  • Omayma A. Elkady,
  • Lamiaa Z. Mohamed

摘要

Equiatomic FeNiMnSi, FeNiMnCr, and FeNiMnSiCr alloys were fabricated using the powder metallurgy technique. Thermodynamic calculations classified FeNiMnSi and FeNiMnCr as medium-entropy alloys, while FeNiMnSiCr was identified as a high-entropy alloy (HEA). Among these, FeNiMnSiCr exhibited the highest relative density and the most favorable thermodynamic stability (Ω = 5.57, ∆Smix = 13.38 kJ/mol K). X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy confirmed a multiphase microstructure with well-dispersed elements. Mechanical testing revealed that FeNiMnSi and FeNiMnSiCr exhibited higher hardness compared with FeNiMnCr. In corrosion studies, FeNiMnSiCr demonstrated the lowest corrosion rates of 0.41 mm/y in 1 M HCl, 0.11 mm/y in 1 M HNO3, and 0.46 mm/y in 1 M H2SO4, confirming its superior chemical resistance. Surface examinations further revealed reduced micro-galvanic attack compared with FeNiMnSi and FeNiMnCr. Overall, these results highlight FeNiMnSiCr as a promising HEA with a balanced combination of mechanical strength and corrosion resistance.