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High entropy alloysHigh entropy alloys of the Cantor family, with modified contents in Mn and Cr, can behave differently in oxidation at high temperatureHigh temperature depending on the composition of air. For instance, in hot air, changes in oxidation behavior can be encountered when water vapor is present. ThermogravimetryThermogravimetry results recently showed that 180 mbars of water partial pressure led to slower mass gain at 1000 °C for a cast Co1Ni1Fe1Mn1.5Cr0.5 alloy and its versions containing either TaC carbides or HfC carbides, as well as to different behaviors during heating (start of oxidation) and cooling (stability of the oxide scales). The purpose of the present extension of this study is to carry out metallographic characterizationMetallographic characterization of the oxidized samples to help in interpreting the differences of mass variation behavior between dry airDry air and wet airWet air evidenced by the previous thermogravimetryThermogravimetry investigations, i.e. lower rate and better resistance to oxide spallation inHigh-entropy alloys case of wet airWet air.

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Oxidized Surfaces and Deteriorated Subsurfaces of HEAs and MC-Strengthened HEAs Oxidized at High Temperature in Presence of Water Vapor

  • 会议论文

  • 发表日期：

    2025年

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  • Patrice Berthod,
  • Lionel Aranda,
  • Ghouti Medjahdi

摘要

High entropy alloysHigh entropy alloys of the Cantor family, with modified contents in Mn and Cr, can behave differently in oxidation at high temperatureHigh temperature depending on the composition of air. For instance, in hot air, changes in oxidation behavior can be encountered when water vapor is present. ThermogravimetryThermogravimetry results recently showed that 180 mbars of water partial pressure led to slower mass gain at 1000 °C for a cast Co1Ni1Fe1Mn1.5Cr0.5 alloy and its versions containing either TaC carbides or HfC carbides, as well as to different behaviors during heating (start of oxidation) and cooling (stability of the oxide scales). The purpose of the present extension of this study is to carry out metallographic characterizationMetallographic characterization of the oxidized samples to help in interpreting the differences of mass variation behavior between dry airDry air and wet airWet air evidenced by the previous thermogravimetryThermogravimetry investigations, i.e. lower rate and better resistance to oxide spallation inHigh-entropy alloys case of wet airWet air.