Thermodynamic analysis of phase equilibria in the Nd-Fe-Cu ternary system

Michitoshi Saeki; Yuji Horino; Luo Jinya; Masanori Enoki; Hiroshi Otani

doi:10.2320/jinstmet.JA201605

Thermodynamic analysis of phase equilibria in the Nd-Fe-Cu ternary system

Michitoshi Saeki, Yuji Horino, Luo Jinya, Masanori Enoki, Hiroshi Otani

Division of Inorganic Material Research

Research output: Contribution to journal › Article

Abstract

A thermodynamic assessment of the Nd-Fe-Cu system was attempted using the CALPHAD method, to clarify an effect of Cu addition to the permanent magnets based on Nd₂Fe₁₄B phase. The regular solution model was applied to liquid phase and solid solutions. Intermediate compounds were described as stoichiometric phases. The formation enthalpy of σ(Nd₆Fe₁₃Cu) phase was evaluated using the first-principles calculation. The result was introduced to the optimization process with some experimental phase boundary data. In the calculated liquidus projection of the ternary system, it is characteristic that the two-phase separation of the liquid phase exists between Fe-rich and (Nd, Cu)-rich regions. The ternary eutectic reaction E1:( L)⇔βNdCu+(αNd)+σ occurs in the Nd-rich region and the reaction temperature is estimated about 508.6?.

Original language	English
Pages (from-to)	32-42
Number of pages	11
Journal	Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume	81
Issue number	1
DOIs	https://doi.org/10.2320/jinstmet.JA201605
Publication status	Published - 2017 Jan 1

Keywords

CALPHAD (calculation of phase diagrams) method
Grain boundary
Neodymium-iron-boron permanent magnets
Phase diagram
Thermodynamic analysis

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

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Saeki, M., Horino, Y., Jinya, L., Enoki, M., & Otani, H. (2017). Thermodynamic analysis of phase equilibria in the Nd-Fe-Cu ternary system. Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, 81(1), 32-42. https://doi.org/10.2320/jinstmet.JA201605

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abstract = "A thermodynamic assessment of the Nd-Fe-Cu system was attempted using the CALPHAD method, to clarify an effect of Cu addition to the permanent magnets based on Nd2Fe14B phase. The regular solution model was applied to liquid phase and solid solutions. Intermediate compounds were described as stoichiometric phases. The formation enthalpy of σ(Nd6Fe13Cu) phase was evaluated using the first-principles calculation. The result was introduced to the optimization process with some experimental phase boundary data. In the calculated liquidus projection of the ternary system, it is characteristic that the two-phase separation of the liquid phase exists between Fe-rich and (Nd, Cu)-rich regions. The ternary eutectic reaction E1:( L)⇔βNdCu+(αNd)+σ occurs in the Nd-rich region and the reaction temperature is estimated about 508.6?.",

keywords = "CALPHAD (calculation of phase diagrams) method, Grain boundary, Neodymium-iron-boron permanent magnets, Phase diagram, Thermodynamic analysis",

author = "Michitoshi Saeki and Yuji Horino and Luo Jinya and Masanori Enoki and Hiroshi Otani",

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AU - Saeki, Michitoshi

AU - Horino, Yuji

AU - Jinya, Luo

AU - Enoki, Masanori

AU - Otani, Hiroshi

PY - 2017/1/1

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AB - A thermodynamic assessment of the Nd-Fe-Cu system was attempted using the CALPHAD method, to clarify an effect of Cu addition to the permanent magnets based on Nd2Fe14B phase. The regular solution model was applied to liquid phase and solid solutions. Intermediate compounds were described as stoichiometric phases. The formation enthalpy of σ(Nd6Fe13Cu) phase was evaluated using the first-principles calculation. The result was introduced to the optimization process with some experimental phase boundary data. In the calculated liquidus projection of the ternary system, it is characteristic that the two-phase separation of the liquid phase exists between Fe-rich and (Nd, Cu)-rich regions. The ternary eutectic reaction E1:( L)⇔βNdCu+(αNd)+σ occurs in the Nd-rich region and the reaction temperature is estimated about 508.6?.

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