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- W2009283609 abstract "An analytical field ion microscope was applied to melt-spun NdFeB magnets with various cobalt substitutions. The microstructure of melt-spun NdFeB magnets consists of three phases. Whereas the Nd2Fe14B- and the metastable Nd7Fe3-phase determine the magnetic properties of optimally quenched specimens the Nd1.1Fe4B4-phase additionally influences the magnetic behaviour of overquenched and annealed material. With Co substitution the Nd-rich phase transforms via the metastable Nd23(Fe1−xCox)75B2 intermediate stage of optimally quenched specimens to the stable Nd(Fe1−xCox)2-phase in over-quenched and annealed ribbons. From our experimental data we conclude that a nucleation model of coercivity is consistent with the magnetic measurements. Un microscope ionique à émission de champ analytique est utilisé pour l'étude d'aimants NdFeB produits par fusion sur roue avec différentes substitutions de Co. La microstructure des aimants NdFeB élaborés par fusion sur roue est formée de trois phases. Tandis que la phase Nd2Fe11B- et la phase métastable Nd7Fe3-déterminent les propriétés magnétiques d'échantillons trempés d'une manière optimale, la phase Nd1, 1Fe1B1 influence en outre le comportement magnétique du matériau trempé brutalement et recuit. Avec la substitution de Co, la phase riche en Nd se transforme en passant par la phase métastable Nd23(Fe1−xCox)75B2 des échantillons trempés d'une manière optimale, en la phase stable Nd(Fe1−xCox)2 des rubans trempés brutalement et recuits. A partir de nos données expérimentales, on conclut qu'un modèle de germination de la coercitivité est compatible avec les mesures magnétiques. Mit einem analytischen Feldionenmikroskop werden schmelzgesponnene NdFeB-Magnete mit verschiedene Kobalt-Substitutionen untersucht. Die mikrostruktur besteht aus drei Phasen. Während die Nd2Fe14B- und die metastabile Nd7Fe3-Phase die magnetischen Eigenschaften optimal abgeschreckter Proben bestimmen, beeinfluβT die Nd1, 1Fe4B4-Phase auβerdem das magnetische Verhalten überabgeschreckten und ausgeheilten Materials. Mit Substitution durch Co wandelt sich die Nd-reiche Phase über die metastabile Zwischenstufe Nd23(Fe1−xCox)75B2 der optimal abgeschreckten Proben in die stabile Nd(Fe1−xCox)2-Phase der überabgeschreckten und ausgeheilten Bänder um. Aus unseren experimentellen Ergebnissen folgern wir, daβ ein Nukleationsmodell der Koerzitivkraft mit den magnetischen Messungen verträglich ist." @default.
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- W2009283609 title "Constitution of melt-spun NdFeB-magnets studied by analytical field ion microscopy" @default.
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- W2009283609 doi "https://doi.org/10.1016/0956-7151(91)90323-s" @default.
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