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Mechanism of the texture development in hydrogen-disproportionation–desorption-recombination (HDDR) processed Nd–Fe–B powders

Sepehri-Amin, H. ; Ohkubo, T. ; Hono, K. ; Güth, K. ; Gutfleisch, O. (2015)
Mechanism of the texture development in hydrogen-disproportionation–desorption-recombination (HDDR) processed Nd–Fe–B powders.
In: Acta Materialia, 85
doi: 10.1016/j.actamat.2014.11.003
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Microstructure evolution in Nd12.8Fe80.1B6.6Ga0.3Nb0.2 alloy powders at different hydrogen pressures during the hydrogen-disproportionation process View the MathML sourcePH2HD has been studied in order to understand the underlying mechanism of the texture development during the dynamic hydrogen-disproportionation–desorption-recombination (d-HDDR) process. Transmission electron microscopy showed that Fe2B grains “memorize” the crystallographic orientation of the initial Nd2Fe14B phase and transfer it to the recombined Nd2Fe14B grains in the highly textured sample. 3-D tomography of backscattered electron SEM images showed that recombined Nd2Fe14B grains nucleate at the interfaces of Fe2B/NdH2 phases, which grow through the interfaces of NdH2/α-Fe phases during the DR process. Boron segregation was found at the NdH2/α-Fe interfaces, which serve as a boron source for the growth of the recombined Nd2Fe14B grains. The mechanism of the texture development is discussed based on the microstructure observations and the corresponding evolution of magnetic properties.

Typ des Eintrags: Artikel
Erschienen: 2015
Autor(en): Sepehri-Amin, H. ; Ohkubo, T. ; Hono, K. ; Güth, K. ; Gutfleisch, O.
Art des Eintrags: Bibliographie
Titel: Mechanism of the texture development in hydrogen-disproportionation–desorption-recombination (HDDR) processed Nd–Fe–B powders
Sprache: Englisch
Publikationsjahr: 15 Februar 2015
Verlag: Elsevier Science Publishing
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Acta Materialia
Jahrgang/Volume einer Zeitschrift: 85
DOI: 10.1016/j.actamat.2014.11.003
Kurzbeschreibung (Abstract):

Microstructure evolution in Nd12.8Fe80.1B6.6Ga0.3Nb0.2 alloy powders at different hydrogen pressures during the hydrogen-disproportionation process View the MathML sourcePH2HD has been studied in order to understand the underlying mechanism of the texture development during the dynamic hydrogen-disproportionation–desorption-recombination (d-HDDR) process. Transmission electron microscopy showed that Fe2B grains “memorize” the crystallographic orientation of the initial Nd2Fe14B phase and transfer it to the recombined Nd2Fe14B grains in the highly textured sample. 3-D tomography of backscattered electron SEM images showed that recombined Nd2Fe14B grains nucleate at the interfaces of Fe2B/NdH2 phases, which grow through the interfaces of NdH2/α-Fe phases during the DR process. Boron segregation was found at the NdH2/α-Fe interfaces, which serve as a boron source for the growth of the recombined Nd2Fe14B grains. The mechanism of the texture development is discussed based on the microstructure observations and the corresponding evolution of magnetic properties.

Freie Schlagworte: Nd–Fe–B permanent magnets, d-HDDR process, Microstructure, Texture
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 10 Feb 2015 09:08
Letzte Änderung: 10 Feb 2015 09:08
PPN:
Sponsoren: This work was in part supported by Japan Science Technology Agency, CREST.
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