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Effect of Ga addition on the microstructure and magnetic properties of hydrogenation–disproportionation–desorption–recombination processed Nd–Fe–B powder / H. Sepehri-Amin in Acta materialia, Vol. 58 N° 4 (Fevrier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 4 (Fevrier 2010) . - pp. 1309–1316 Titre : Effect of Ga addition on the microstructure and magnetic properties of hydrogenation–disproportionation–desorption–recombination processed Nd–Fe–B powder Type de document : texte imprimé Auteurs : H. Sepehri-Amin, Auteur ; W.F. Li, Auteur ; T. Ohkubo, Auteur Année de publication : 2011 Article en page(s) : pp. 1309–1316 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Permanent  magnets  Nd–Fe–B  HDDR  Coercivity  Atom  probe  tomography Résumé : Microstructural evolution of hydrogenation–disproportionation–desorption–recombination processed Nd12.5Fe72.8Co8.0B6.5Ga0.2 powder has been investigated in relation to coercivity development during the desorption recombination process. Coercivity increases when residual NdH2 is completely dehydrogenated and the decomposed Nd is segregated at the grain boundaries of the Nd2Fe14B phase. Three-dimensional atom probe (3DAP) analysis indicates the segregation of Ga at the grain boundary. The reason for the enhancement of the coercivity by the trace addition Ga is discussed based on the 3DAP results. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409007290 [article] Effect of Ga addition on the microstructure and magnetic properties of hydrogenation–disproportionation–desorption–recombination processed Nd–Fe–B powder [texte imprimé] / H. Sepehri-Amin, Auteur ; W.F. Li, Auteur ; T. Ohkubo, Auteur . - 2011 . - pp. 1309–1316. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 4 (Fevrier 2010) . - pp. 1309–1316 Mots-clés : Permanent  magnets  Nd–Fe–B  HDDR  Coercivity  Atom  probe  tomography Résumé : Microstructural evolution of hydrogenation–disproportionation–desorption–recombination processed Nd12.5Fe72.8Co8.0B6.5Ga0.2 powder has been investigated in relation to coercivity development during the desorption recombination process. Coercivity increases when residual NdH2 is completely dehydrogenated and the decomposed Nd is segregated at the grain boundaries of the Nd2Fe14B phase. Three-dimensional atom probe (3DAP) analysis indicates the segregation of Ga at the grain boundary. The reason for the enhancement of the coercivity by the trace addition Ga is discussed based on the 3DAP results. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409007290