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<p>According to the experimental information of 40 as-cast alloy samples, the liquidus surface projection of the Co–Fe–Nb system for the whole composition range was built. Six primary solidification regions bcc(Nb), fcc(Co,Fe), <i>μ</i>, <i>λ</i><sub>3</sub>, <i>λ</i><sub>2</sub>, and <i>λ</i><sub>1</sub> were experimentally identified, and the possible ranges of primary solidification regions of <i>λ</i><sub>1</sub> and <i>λ</i><sub>2</sub> were distinguished using electron backscatter diffraction (EBSD) and energy dispersive spectrometry (EDS) in the scanning electron microscopy (SEM). The isothermal sections at 1200&#xa0;°C, 1100&#xa0;°C, and 1000&#xa0;°C were re-constructed by microstructure and phase constituents of equilibria alloys. A new two-phase equilibrium fcc(Co,Fe) + <i>λ</i><sub>3</sub> was experimentally determined at 1200&#xa0;°C, 1100&#xa0;°C, and 1000&#xa0;°C, and Fe had a considerable solubility in <i>λ</i><sub>3</sub> at above temperatures. Based on the experimental data, the thermodynamic optimization of this system was made using the CALculation of PHAse Diagrams (CALPHAD) method, and a set of self-consistent and reasonable thermodynamic parameters was obtained.</p>

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Experimental Investigation and Thermodynamic Optimization of the Co–Fe–Nb System

  • 期刊论文

  • 发表日期：

    2025年6月5日

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  • Daomin Ye,
  • Bo Yang,
  • Cuiping Guo,
  • Huimin Zheng,
  • Changrong Li,
  • Zhenmin Du

摘要

According to the experimental information of 40 as-cast alloy samples, the liquidus surface projection of the Co–Fe–Nb system for the whole composition range was built. Six primary solidification regions bcc(Nb), fcc(Co,Fe), μ, λ3, λ2, and λ1 were experimentally identified, and the possible ranges of primary solidification regions of λ1 and λ2 were distinguished using electron backscatter diffraction (EBSD) and energy dispersive spectrometry (EDS) in the scanning electron microscopy (SEM). The isothermal sections at 1200 °C, 1100 °C, and 1000 °C were re-constructed by microstructure and phase constituents of equilibria alloys. A new two-phase equilibrium fcc(Co,Fe) + λ3 was experimentally determined at 1200 °C, 1100 °C, and 1000 °C, and Fe had a considerable solubility in λ3 at above temperatures. Based on the experimental data, the thermodynamic optimization of this system was made using the CALculation of PHAse Diagrams (CALPHAD) method, and a set of self-consistent and reasonable thermodynamic parameters was obtained.