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<p>This study investigates the impact of post-sintering heat treatment on the phase composition, microstructure, wear resistance, and corrosion behavior of an AlCrCoFeNiMn high-entropy alloy (HEA) produced via ball milling and spark plasma sintering. XRD results showed that the initial samples contained BCC, <i>σ</i> (sigma), minor FCC, and B2 phases. Heat treatment at 1100&#xa0;°C reduced σ and stabilized the B2 phase, while treatment at 1400&#xa0;°C promoted FCC phase dominance, eliminating brittle phases due to enhanced diffusion. Microstructural analyses revealed improved homogeneity and reduced grain growth, resulting in less segregation. Heat treatment at 1400&#xa0;°C for 3 h yielded the best wear and corrosion resistance due to the formation of protective oxide layers and a uniform structure. In contrast, extended treatment at 1100&#xa0;°C led to segregation and poorer corrosion resistance. The results highlight the critical role of heat treatment in optimizing HEA properties for structural and functional uses.</p>

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Effect of Post-Sintering Heat Treatment on the Microstructure, Wear, and Corrosion Behavior of AlCrCoFeNiMn High-Entropy Alloy Fabricated by Spark Plasma Sintering

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Ali Jalili,
  • Amir Reza Mashtizadeh,
  • Ahmed Sulaiman Al-Harras,
  • Hossein Aghajani

摘要

This study investigates the impact of post-sintering heat treatment on the phase composition, microstructure, wear resistance, and corrosion behavior of an AlCrCoFeNiMn high-entropy alloy (HEA) produced via ball milling and spark plasma sintering. XRD results showed that the initial samples contained BCC, σ (sigma), minor FCC, and B2 phases. Heat treatment at 1100 °C reduced σ and stabilized the B2 phase, while treatment at 1400 °C promoted FCC phase dominance, eliminating brittle phases due to enhanced diffusion. Microstructural analyses revealed improved homogeneity and reduced grain growth, resulting in less segregation. Heat treatment at 1400 °C for 3 h yielded the best wear and corrosion resistance due to the formation of protective oxide layers and a uniform structure. In contrast, extended treatment at 1100 °C led to segregation and poorer corrosion resistance. The results highlight the critical role of heat treatment in optimizing HEA properties for structural and functional uses.