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Equimolar CoNiFeCr multi-principal element alloys present rather high refractoriness with solidus temperaturesTemperature close to 1300 °C as well as good resistance against oxidation by hot air. However, to allow them to be creep-resistant enough, additions can be required. These chemical modificationsModification may influence either in the good direction, or in a bad way, their high temperatureHigh temperature oxidation behavior. In this work, after having characterized the oxidation behavior of an equimolar CoNiFeCr alloy at 1200 °C using a thermobalance, versions with addition of either 2 wt%Ti or 6 wt%Ta were elaborated and tested in hot oxidationHot oxidation for the same conditions as the former reference alloy. Results clearly evidenced the influences of Ti and of Ta on the three stages of the thermogravimetryThermogravimetry tests: oxidation during heating, isothermal mass gain kinetic and oxide spallation during cooling. These changes in behavior were interpreted by exploiting the results of post-mortem examination of the oxidized samples, before and after cross-sectional preparation.

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Influence of the Presence of Ti or Ta on the Oxidation Behavior at 1200 °C of Cast MPEAs Derived from an Equimolar CoNiFeCr Basis

  • 会议论文

  • 发表日期：

    2025年

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  • Siouare Hammi,
  • Yasmina El Hadad,
  • Lyna Amrouche,
  • Romin Chevalme,
  • Lionel Aranda,
  • Patrice Berthod

摘要

Equimolar CoNiFeCr multi-principal element alloys present rather high refractoriness with solidus temperaturesTemperature close to 1300 °C as well as good resistance against oxidation by hot air. However, to allow them to be creep-resistant enough, additions can be required. These chemical modificationsModification may influence either in the good direction, or in a bad way, their high temperatureHigh temperature oxidation behavior. In this work, after having characterized the oxidation behavior of an equimolar CoNiFeCr alloy at 1200 °C using a thermobalance, versions with addition of either 2 wt%Ti or 6 wt%Ta were elaborated and tested in hot oxidationHot oxidation for the same conditions as the former reference alloy. Results clearly evidenced the influences of Ti and of Ta on the three stages of the thermogravimetryThermogravimetry tests: oxidation during heating, isothermal mass gain kinetic and oxide spallation during cooling. These changes in behavior were interpreted by exploiting the results of post-mortem examination of the oxidized samples, before and after cross-sectional preparation.