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Severe plastic deformation of Nd-Fe-B nanocomposite magnets at room temperature

[Display omitted] •A new nanocomposite magnet (Hc = 9.7 kOe and σsat. = 171 emu/g) was developed.•High-pressure torsion was applied to nanocomposite magnets to induce texture.•The microstructures were investigated by TEM and FIB-SEM both in 2D and 3D.•The size and shape of the individual α-Fe phase...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2019-03, Vol.473, p.51-60
Main Authors: Hosokawa, Akihide, Takagi, Kenta, Kuriiwa, Takahiro, Inoue, Yuki, Ozaki, Kimihiro
Format: Article
Language:English
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Summary:[Display omitted] •A new nanocomposite magnet (Hc = 9.7 kOe and σsat. = 171 emu/g) was developed.•High-pressure torsion was applied to nanocomposite magnets to induce texture.•The microstructures were investigated by TEM and FIB-SEM both in 2D and 3D.•The size and shape of the individual α-Fe phase particles were quantitatively analyzed.•The multi-phases microstructure was significantly distorted by HPT. A newly developed isotropic Nd2Fe14B/α-Fe nanocomposite magnet was subjected to a series of investigations of its microstructure and magnetic properties. The performance of the optimally annealed sample was found to be Hc = 9.7 kOe and σsat. = 171 emu/g. Moreover, an attempt was made to produce anisotropic nanocomposite magnets by a high-pressure torsion (HPT) experiment performed at room temperature. The microstructural analyses by TEM in 2D and by FIB-SEM serial sectioning in 3D elucidated that the two-phases microstructure is not distorted homogeneously but shear bands (SBs) are formed. It was found that both the hard magnetic Nd2Fe14B and soft magnetic α-Fe phases are distorted significantly near those SBs even though the crystallographic orientations of the Nd2Fe14B grains are randomized therein. The relationships between this microstructure developed by HPT and the corresponding magnetic properties are discussed.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2018.10.032