Thermodynamic re-assessment of the Fe-Dy and Fe-Tb binary systems |
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| Affiliation: | 1. Institute of Materials Structure Science, High Energy Accelerator Organization (KEK), 1-1 Oho, Tsukuba 305-0801, Japan;2. Center of Computational Materials Science, Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Japan;3. Elements Strategy Initiative Center for Magnetic Materials (ESICMM), National Institute of Material Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan;1. School of Materials Science and Engineering, Central South University, Changsha 410083, PR China;2. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China;3. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, PR China |
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| Abstract: | In this work, based on the critical evaluation of previous optimizations and available experimental data in the published literature, the Fe-Dy and Fe-Tb binary systems were re-assessed thermodynamically using the CALPHAD method. The solution phases including liquid, fcc-Fe, bcc-Fe, bcc-Dy, bcc-Tb, hcp-Dy and hcp-Tb, were described by the substitutional solution model and their excess Gibbs energies were expressed with the Redlich-Kister polynomial. Due to their narrow homogeneity ranges, the intermetallic compounds, Fe17Dy2, Fe23Dy6, Fe3Dy, Fe2Dy, Fe17Tb2, Fe23Tb6, Fe3Tb and Fe2Tb, were modeled as stoichiometric compounds. Self-consistent thermodynamic parameters to describe the Gibbs energies of various phases in the Fe-Dy and Fe-Tb binary systems were obtained finally. The calculated results are in good agreement with the reported phase equilibria and thermodynamic properties. |
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| Keywords: | Permanent magnets Fe-Dy and Fe-Tb binary systems Phase diagram Thermodynamic CALPHAD |
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