Development of a prototype thermodynamic database for Nd-Fe-B permanent magnets

For the Nd-Fe-B permanent magnets, a prototype thermodynamic database of the 8-element system (Nd, Fe, B, Al, Co, Cu, Dy, Ga) was constructed based on literature data and assessed parameters in the present work. The magnetic excess Gibbs energy of the Nd 2 Fe 14 B compound was reassessed using thoro...

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Bibliographic Details
Published in:Science and technology of advanced materials 2021-12, Vol.22 (1), p.557-570
Main Authors: Abe, Taichi, Morishita, Masao, Chen, Ying, Saengdeejing, Arkapol, Hashimoto, Kiyoshi, Kobayashi, Yoshinao, Ohnuma, Ikuo, Koyama, Toshiyuki, Hirosawa, Satoshi
Format: Article
Language:English
Subjects:
203 Magnetics / Spintronics / Superconductors
40 Optical, magnetic and electronic device materials
407 CALPHAD / Phase field methods
605 Databases, data structure, ontology
Focus on Science and Technology of Element-Strategic Permanent Magnets
Gibbs energy
metastable states
phase equilibria
Review
Thermodynamic database
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Summary:For the Nd-Fe-B permanent magnets, a prototype thermodynamic database of the 8-element system (Nd, Fe, B, Al, Co, Cu, Dy, Ga) was constructed based on literature data and assessed parameters in the present work. The magnetic excess Gibbs energy of the Nd 2 Fe 14 B compound was reassessed using thoroughly measured heat capacity data. The Dy-Nd binary system was reassessed based on formation energies estimated from ab initio calculations. The constructed database was applied successfully for estimations of phase equilibria during the grain boundary diffusion processes (GBDP) and the reactions in the hydrogenation decomposition desorption recombination (HDDR) processes.
ISSN:1468-6996
1878-5514
DOI:10.1080/14686996.2021.1936627