Development of a prototype thermodynamic database for Nd-Fe-B permanent magnets. Issue 1 (31st December 2021)

• Record Type: Journal Article
• Authors: Abe, Taichi; Morishita, Masao; Chen, Ying; Saengdeejing, Arkapol; Hashimoto, Kiyoshi; Kobayashi, Yoshinao; Ohnuma, Ikuo; Koyama, Toshiyuki; Hirosawa, Satoshi
• Is Part Of: Science and technology of advanced materials. Volume 22:Issue 1(2021)
• Page Start: 557
• Page End: 570
• Publication Date: 2021-12-31
• Subjects: Thermodynamic database -- Gibbs energy -- phase equilibria -- metastable states; 40 Optical, magnetic and electronic device materials -- 203 Magnetics / Spintronics / Superconductors -- 605 Databases, data structure, ontology -- 407 CALPHAD / Phase field methods; Materials -- Technological innovations -- Periodicals; 620.112
• DOI: 10.1080/14686996.2021.1936627
• Languages: English
• ISSNs: 1468-6996

Abstract

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 Nd2 Fe14 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. Graphical abstract: uf0001