Suppression mechanism of abnormal grain growth by Zr addition in pressless processed Nd-Fe-B sintered magnets

Itakura, Masaru; Sugiyama, Koichi; Akamine, Hiroshi; Nishida, Minoru; Nakamura, Misato; Mizoguchi, T.; Iriyama, Takahiko

doi:10.1016/j.jallcom.2021.161244

Cited by 9 publications

(2 citation statements)

References 29 publications

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“…Cu, Ga and Zr are mainly segregated in the intergranular phase. Al, Cu and Ga could improve the wettability of the grain boundary and reduce the grain boundary deformation, and Zr could prevent abnormal grain growth [36]. The content of the minor elements is high in the sintered Nd 13.5 Fe 79.18 M 1.52 B 5.8 , which should contribute to a more homogeneous microstructure, and the magnetization reversals are more uniform and the squareness of the demagnetization curve is good.…”

Section: Resultsmentioning

confidence: 99%

Macroscopic phenomenon of exchange coupling and microscopic effect on magnetization reversal in sintered Nd–Fe–B magnets

Wang,

Li,

et al. 2024

J. Phys. D: Appl. Phys.

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The permanent magnets of Nd13.5Fe79.18M1.52B5.8 and Nd13.5Fe79.76M0.94B5.8 were prepared, respectively, via strip casting, jet milling and sintering followed by annealing, and adding the non-ferromagnetic elements M (Al, Cu, Ga and Zr) could not only modify the microstructure, but also regulate the exchange coupling effect in the sintered magnets. From the macroscopic view the recoil loops bear spring behavior in Nd13.5Fe79.76M0.94B5.8, indicating that the energy barrier could be overcome by the intergranular exchange coupling. From the microcosmic view, the exchange coupling could increase the domain wall size by suppressing the nucleation of reversed domain, and so the activation volume increases in thermal activation. In Nd13.5Fe79.76M0.94B5.8 the exchange coupling effect is stronger, and both the coercivty of 15.0 kOe and the remanence of 14.3 kGs are a little higher than those of Nd13.5Fe79.18M1.52B5.8 magnets in which the content of non-ferromagnetic elements is a little higher and the exchange coupling effect is weaker. So the exchange coupling must not decrease the coercivity owing to the exchange coupling suppressing the nucleation of reversed domain, though the microstructure is inhomogeneous in the sintered magnets of Nd13.5Fe79.76M0.94B5.8. Reducing the defects size and decreasing the defects concentration should be the practical way to improve the coercivity in Nd-Fe-B permanent magnets.

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Section: Resultsmentioning

confidence: 99%

Macroscopic phenomenon of exchange coupling and microscopic effect on magnetization reversal in sintered Nd–Fe–B magnets

Wang,

Li,

et al. 2024

J. Phys. D: Appl. Phys.

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show abstract

“…However, such borides, under the form of nanoprecipitates, are liable to limit the grain growth during sintering. This pinning effect allows the sintering temperature to be adjusted in order to obtain full densification and better magnetic properties [147], [148]. Ta, Nb and Mo are also mentioned to help the microstructure refinement in (Ce,Nd)-Fe-B alloys [149], [150].…”

Section: Zr and Hf Additionmentioning

confidence: 99%

Nd2Fe14B permanent magnets substituted with non-critical light rare earth elements (Ce, La): A review

Delette

2023

Journal of Magnetism and Magnetic Materials

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Coupling effects of hydrogen and Dy/Nb on magnetic properties of sintered NdFeB magnets

Zhang

Wang

et al. 2022

International Journal of Hydrogen Energy

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Suppression mechanism of abnormal grain growth by Zr addition in pressless processed Nd-Fe-B sintered magnets

Cited by 9 publications

References 29 publications

Macroscopic phenomenon of exchange coupling and microscopic effect on magnetization reversal in sintered Nd–Fe–B magnets

Macroscopic phenomenon of exchange coupling and microscopic effect on magnetization reversal in sintered Nd–Fe–B magnets

Nd2Fe14B permanent magnets substituted with non-critical light rare earth elements (Ce, La): A review

Coupling effects of hydrogen and Dy/Nb on magnetic properties of sintered NdFeB magnets

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