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

Taichi Abe, Masao Morishita, Ying Chen, Arkapol Saengdeejing, Kiyoshi Hashimoto, Yoshinao Kobayashi, Ikuo Ohnuma, Toshiyuki Koyama, Satoshi Hirosawa

Research output: Contribution to journalReview articlepeer-review

Abstract

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 Nd2Fe14B 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.

Original languageEnglish
Pages (from-to)557-570
Number of pages14
JournalScience and Technology of Advanced Materials
Volume22
Issue number1
DOIs
Publication statusPublished - 2021

Keywords

  • 203 Magnetics / Spintronics / Superconductors
  • 40 Optical, magnetic and electronic device materials
  • 407 CALPHAD / Phase field methods
  • 605 Databases, data structure, ontology
  • Gibbs energy
  • metastable states
  • phase equilibria
  • Thermodynamic database

ASJC Scopus subject areas

  • Materials Science(all)

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