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<p>Thermomechanical processing is a reliable technique employed to gain insight into high-temperature behaviors and to optimize its microstructural characteristics. In this study, the hot deformation characteristics of a novel Co<sub>12.5</sub>Cr<sub>12.5</sub>Cu<sub>12.5</sub>Fe<sub>12.5</sub>Ni<sub>37.5</sub>Si<sub>12.5</sub> high-entropy alloy (HEA) were systematically evaluated in homogenized condition across a thermomechanical range of 800-950&#xa0;°C and 0.01 to 10&#xa0;s<sup>-1</sup> up to 0.92 true strain. The experimental flow stress curve revealed a gradual increase in true stress values with increasing deformation rates and decreasing deformation temperatures. The Arrhenius-type constitutive equations revealed the strain hardening exponent of 4.84 and mean deformation activation energy of 541&#xa0;kJ/mol under peak flow stress conditions. The high-temperature workability of the studied alloy was optimized with the modified dynamic material model (MDMM), and the three-dimensional workability map displayed a progressive increase in power dissipation efficiency with increasing strain. The workability map demonstrated a peak dissipation efficiency (η) of 61%. The microstructural analysis in zone 1 revealed that material had undergone significant dynamic softening (DRX fraction ~ 79%). The mechanism of dynamic recrystallization during hot working was identified as discontinuous dynamic recrystallization (DDRX). The conceptualization of thermomechanical range (including workability map and microstructural evolution) identified as Zone D in the optimum working range of 890-950&#xa0;°C, 0.01-0.025&#xa0;s<sup>-1</sup>.</p>

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Characterization of Dynamic Recrystallization and Microstructural Evolution using 3D Workability Map of Homogenized Co12.5Cr12.5Cu12.5Fe12.5Ni37.5Si12.5 High-Entropy Alloy

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Saket Kumar,
  • Nitish Raja,
  • Mrinmoy Sinha,
  • Suruj P. Neog,
  • C. Pandey,
  • Manoj Chopkar

摘要

Thermomechanical processing is a reliable technique employed to gain insight into high-temperature behaviors and to optimize its microstructural characteristics. In this study, the hot deformation characteristics of a novel Co12.5Cr12.5Cu12.5Fe12.5Ni37.5Si12.5 high-entropy alloy (HEA) were systematically evaluated in homogenized condition across a thermomechanical range of 800-950 °C and 0.01 to 10 s-1 up to 0.92 true strain. The experimental flow stress curve revealed a gradual increase in true stress values with increasing deformation rates and decreasing deformation temperatures. The Arrhenius-type constitutive equations revealed the strain hardening exponent of 4.84 and mean deformation activation energy of 541 kJ/mol under peak flow stress conditions. The high-temperature workability of the studied alloy was optimized with the modified dynamic material model (MDMM), and the three-dimensional workability map displayed a progressive increase in power dissipation efficiency with increasing strain. The workability map demonstrated a peak dissipation efficiency (η) of 61%. The microstructural analysis in zone 1 revealed that material had undergone significant dynamic softening (DRX fraction ~ 79%). The mechanism of dynamic recrystallization during hot working was identified as discontinuous dynamic recrystallization (DDRX). The conceptualization of thermomechanical range (including workability map and microstructural evolution) identified as Zone D in the optimum working range of 890-950 °C, 0.01-0.025 s-1.