Tensile deformation behavior of Nd–Fe–B alloys

Yasuda, Hiroyuki; Kumano, M.; Nagase, Takeshi; Kato, Rumiko; Shimizu, Haruhiko

doi:10.1016/j.scriptamat.2011.07.027

Cited by 16 publications

(4 citation statements)

References 16 publications

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“…But the alignment of atomized powder to c-axis even after hotdeformation process was not enough clear compared with melt spun powder [11]. In case of the melt spun powder, orientation is aligned to c-axis due to rotation of the nano sized grains by toque and perpendicular grain growth with c-axis [11,12]. But the atomized powder cannot follow this mechanism because of large grain size.…”

Section: Resultsmentioning

confidence: 99%

“…The texture of Nd-Fe-B can be changed during sintering process in order to match the surface energy [10]. But the alignment of atomized powder to c-axis even after hotdeformation process was not enough clear compared with melt spun powder [11]. In case of the melt spun powder, orientation is aligned to c-axis due to rotation of the nano sized grains by toque and perpendicular grain growth with c-axis [11,12].…”

Section: Resultsmentioning

confidence: 99%

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Archives of Metallurgy and Materials

Cho¹,

Abbas²,

Yong-Ho-Choa³

et al. 2019

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Rare earth Nd-Fe-B, a widely used magnet composition, was synthesized in a shape of powders using gas atomization, a rapid solidification based process. The microstructure and properties were investigated in accordance with solidification rate and densification. Detailed microstructural characterization was performed by using scanning electron microscope (SEM) and the structural properties were measured by using X-ray diffraction. Iron in the form of α-Fe phase was observed in powder of about 30 μm. It was expected that fraction of Nd 2 Fe 14 B phase increased rapidly with decrease in powder size, on the other hand that of α-Fe phase was decreased. Nd-rich phase diffused from grain boundary to particle boundary after hot deformation due to capillary action. The coercivity of the alloy decreased with increase in powder size. After hot deformation, Nd 2 Fe 14 B phase tend to align to c-axis.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Archives of Metallurgy and Materials

Cho¹,

Abbas²,

Yong-Ho-Choa³

et al. 2019

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“…Because of the excellent magnetic properties, Re-based anisotropic sintered magnets (Re = Rare earth) are widely used in the various fields, such as Magnetic resonance imaging (MRi), speakers, electric vehicles (eVs), and wind generators [1][2][3]. Traditionally, the magnets have been fabricated by strip casting or melt spinning; however, it has shown the disadvantages which are the complex processes and the fabricated powder easily oxidized owing to a large surface.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Cho

Song

Choa

et al. 2021

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EffEct of DEformation tEmpEraturE on thE magnEtic propErtiEs of prfeB alloy faBricatED By gas atomizationTo form the fine micro-structures, the Pr 17 Fe 78 B 5 magnet powders were produced in the optimized gas atomization conditions and it was investigated that the formation of the textures, microstructures, and the changes in the magnetic properties with increasing the deformation temperatures and rolling directions. Due to the rapid cooling system than the casting process, the homogenous microstructures were composed of the Pr-rich and Pr 2 Fe 14 B without any oxides and α-Fe and enables grain refinement. The pore ratios were 2.87, 1.42, and 0.22% at the deformation temperatures of 600, 700, 800°C, respectively in the rolled samples to align the c-axis which is the magnetic easy axis. Because Pr-rich phase cannot flow into the pore with a liquid state at low temperature, the improvement of pore densification was gradually observed with increasing deformation temperature. To confirm the magnetic decoupling effects of Pr 2 Fe 14 B phases by Pr-rich phases, the magnetic properties were investigated in rolled samples produced at the deformation temperature of 800°C. Although the remanent field is slightly decreased by 30%, the coercivity fields increased by about 2 times than that previous casted ingot. it is suggested that the gas atomization method can be suitable for fabricating grain refined and pure PrFeB magnets, and the plastic deformation conditions and rolling directions are a critical role to manipulate microstructure and magnetic properties.

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“…NdFeB magnets are generally fabricated using two sintering methods, one of which involves employing pulverized powder obtained from casted strips by a combination of hydrogen decrepitation (HD) and jet milling. In the other method, hot deformation is performed by die-upsetting pulverized melt-spun ribbons [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Cho¹,

Yong-Ho-Choa²,

Sun-Woo-Nam³

et al. 2020

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NdFeB anisotropic sintered permanent magnets are typically fabricated by strip casting or melt spinning. In this study, the plastic deformability of an NdFeB alloy was investigated to study the possibility of fabricating anisotropic sintered magnets using gas atomized powders. The results show that the stoichiometric composition Nd 12 Fe 82 B 6 softens at high temperatures. The aspect ratio and orientation factor of Nd 12 Fe 82 B 6 billets after plastic deformation were found to increase with increasing plastic deformation temperature, particularly above 800℃. This confirms that softening at high temperatures can lead to plastic deformation of Nd 2 Fe 14 B hard magnetic phases.

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Tensile deformation behavior of Nd–Fe–B alloys

Cited by 16 publications

References 16 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

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