Publication Date

9-8-2020

Department

Ames Laboratory; Materials Science and Engineering

Campus Units

Ames Laboratory, Materials Science and Engineering

OSTI ID+

1665952

Report Number

IS-J 10319

DOI

10.1109/TMAG.2020.3022739

Journal Title

IEEE Transactions on Magnetics

Volume Number

57

Issue Number

2

Abstract

High coercivity and anisotropic Nd-Fe-B powders for making anisotropic bonded magnets have been prepared by hydrogenation-disproportionation-desorption-recombination (HDDR). We found that the processing hydrogen pressure is intimately correlated with the formation of c -axis crystal texture of Nd 2 Fe 14 B phase. There exists a critical hydrogen pressure, Pcrit , during hydrogen-disproportionation stage, that promotes the formation of c -axis crystal texture. When processing hydrogen pressure is higher than Pcrit , the formation of c -axis texture deteriorates and results in isotropic Nd-Fe-B magnetic powders. The existence of Pcrit is ascribed to the thermodynamics and kinetics origin during HDDR process.

DOE Contract Number(s)

AC02-07CH11358; AC05-00OR22725

Language

en

Department of Energy Subject Categories

36 MATERIALS SCIENCE

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Available for download on Wednesday, September 08, 2021

Included in

Metallurgy Commons

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