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<p>In this study, an equiatomic CoCrFeMnNi high entropy alloy (HEA) was prepared by powder metallurgy (PM) and casting methods. Both processed HEAs exhibited face-centered cubic (FCC) and Cr-rich sigma (σ) phases. To mitigate the presence of undesirable Cr-rich σ phase, heat treatment was performed at 800&#xa0;°C, 1000&#xa0;°C, and 1200&#xa0;°C for 5 hours. The effects of heat treatment (HT) temperature on phase, microstructure, and hardness properties of HEAs were investigated. The PM-processed HEA exhibited superior microhardness (~408 ± 10 HV), nanohardness (~6.54 GPa), and elastic modulus (~254.29 GPa) compared to the as-cast HEA due to its fine-grained and uniform microstructure. However, increasing heat treatment temperatures caused a reduction in hardness and elastic modulus in both processed HEAs, due to grain coarsening and reduced fraction of the Cr-rich σ phase. The present study highlights the critical role of heat treatment in optimizing the phase, microstructure, and hardness behavior of HEAs produced by PM and casting techniques.</p>

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Effect of Processing and Heat Treatment on the Phase Kinetics, Microstructure, and Hardness Behavior of CoCrFeMnNi High Entropy Alloy

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • Cheenepalli Nagarjuna,
  • Sheetal Kumar Dewangan,
  • K. Raja Rao,
  • Hansung Lee,
  • Eunhyo Song,
  • Byungmin Ahn

摘要

In this study, an equiatomic CoCrFeMnNi high entropy alloy (HEA) was prepared by powder metallurgy (PM) and casting methods. Both processed HEAs exhibited face-centered cubic (FCC) and Cr-rich sigma (σ) phases. To mitigate the presence of undesirable Cr-rich σ phase, heat treatment was performed at 800 °C, 1000 °C, and 1200 °C for 5 hours. The effects of heat treatment (HT) temperature on phase, microstructure, and hardness properties of HEAs were investigated. The PM-processed HEA exhibited superior microhardness (~408 ± 10 HV), nanohardness (~6.54 GPa), and elastic modulus (~254.29 GPa) compared to the as-cast HEA due to its fine-grained and uniform microstructure. However, increasing heat treatment temperatures caused a reduction in hardness and elastic modulus in both processed HEAs, due to grain coarsening and reduced fraction of the Cr-rich σ phase. The present study highlights the critical role of heat treatment in optimizing the phase, microstructure, and hardness behavior of HEAs produced by PM and casting techniques.