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<p>In this study, synthesis, characterization, mechanical and tribology properties of AlCoCrFeMg<sub>x</sub> high-entropy alloy (HEA) fabricated through mechanical alloying (MA) and hot pressing (HP) are investigated. x represents the atomic fraction of the Mg element at 0.2, 0.4, 0.6 and 0.8. A single-phase body-centered cubic (BCC) solid solution was obtained after MA and after HP. Further, the melting point of milled HEA powder was estimated to be 1280&#xa0;°C using differential scanning calorimetry (DSC). The hot pressing was carried out at 950&#xa0;°C in an argon environment. Field emission scanning electron microscopy (FE-SEM) confirmed the morphology of the prepared powder and hot-pressed samples of the prepared HEAs. This study also compares the hardness and microstructural characteristics of the alloys to better understand the influence of different atomic fractions of Mg (0,0.2,0.4,0.6, and 0.8) in HEAs. Overall, the findings in this report provide insights into the high-performance HEAs, and the hardness was highest with a value of 950 HV for AlCoCrFe HEA and better wear with the lowest coefficient of friction (COF) of 0.56 for AlCoCrFeMg<sub>0</sub>.<sub>8</sub> HEA.</p>

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Synthesis and Characterization of AlCoCrFeMgx High-Entropy Alloys with Varying Mg Content via Powder Metallurgy Route

  • 期刊论文

  • 发表日期：

    2025年9月25日

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

摘要

In this study, synthesis, characterization, mechanical and tribology properties of AlCoCrFeMgx high-entropy alloy (HEA) fabricated through mechanical alloying (MA) and hot pressing (HP) are investigated. x represents the atomic fraction of the Mg element at 0.2, 0.4, 0.6 and 0.8. A single-phase body-centered cubic (BCC) solid solution was obtained after MA and after HP. Further, the melting point of milled HEA powder was estimated to be 1280 °C using differential scanning calorimetry (DSC). The hot pressing was carried out at 950 °C in an argon environment. Field emission scanning electron microscopy (FE-SEM) confirmed the morphology of the prepared powder and hot-pressed samples of the prepared HEAs. This study also compares the hardness and microstructural characteristics of the alloys to better understand the influence of different atomic fractions of Mg (0,0.2,0.4,0.6, and 0.8) in HEAs. Overall, the findings in this report provide insights into the high-performance HEAs, and the hardness was highest with a value of 950 HV for AlCoCrFe HEA and better wear with the lowest coefficient of friction (COF) of 0.56 for AlCoCrFeMg0.8 HEA.