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<p>The creep deformation behavior of a composite consisting of two medium-entropy alloys (MEAs), CoCrFeNi (fcc structure) and AlCoCrFe (bcc structure), synthesized via mechanical alloying and spark plasma sintering was investigated. Constant-load high-temperature creep tests were conducted at temperatures ranging from 600 to 750°C under an applied load of 100&#xa0;MPa. Stress jump tests at 650°C revealed a stress exponent of 4, indicating that dislocation creep was the dominant deformation mechanism. The activation energy for creep deformation was determined to be 100&#xa0;kJ&#xa0;mol<sup>-1</sup>, likely due to Ni pipe diffusion. The bcc phase exhibited significant phase fraction and grain growth under creep conditions, suggesting a stress-assisted grain growth and diffusion. This study represents the first exploration of creep behavior in dual-phase MEA composites and thus presents the challenges of conventional creep analysis in materials with such complex microstructures and compositions.</p>

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Creep Deformation of a Composite of Dual-Phase Medium Entropy Alloys

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • Abhishek Kumar,
  • Satyam Kumar,
  • Jyoti Kumari,
  • Swati Kumari,
  • Divanshu Kumar,
  • Niraj Chawake

摘要

The creep deformation behavior of a composite consisting of two medium-entropy alloys (MEAs), CoCrFeNi (fcc structure) and AlCoCrFe (bcc structure), synthesized via mechanical alloying and spark plasma sintering was investigated. Constant-load high-temperature creep tests were conducted at temperatures ranging from 600 to 750°C under an applied load of 100 MPa. Stress jump tests at 650°C revealed a stress exponent of 4, indicating that dislocation creep was the dominant deformation mechanism. The activation energy for creep deformation was determined to be 100 kJ mol-1, likely due to Ni pipe diffusion. The bcc phase exhibited significant phase fraction and grain growth under creep conditions, suggesting a stress-assisted grain growth and diffusion. This study represents the first exploration of creep behavior in dual-phase MEA composites and thus presents the challenges of conventional creep analysis in materials with such complex microstructures and compositions.