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)
