Significant enhancement in the coercivity and thermal stability of bulk hot-deformed Nd-Fe-B magnets by intergranular addition of Nd-Dy/Tb-Cu-Ga alloys

Xia, Xianshuang; Tang, Xu; Du, Yeyuan; Wu, Haichen; Ju, Jinyun; Wu, Lian; Chen, Renjie; Yin, Wen; Zhang, Lanting; Yan, Aru

doi:10.1016/j.actamat.2022.117945

Cited by 17 publications

(7 citation statements)

References 47 publications

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“…It was reported by Lee et al [ 73 ] that the addition of a Nd 35 Dy 35 Cu 30 alloy with a low melting point of 610 °C achieved an almost identical coercivity compared to the doping with a Dy 70 Cu 30 alloy with high melting point of 795 °C, almost doubling the utilization efficiency of the HREs. Recently, Xia et al [ 74 ] also reported that the high coercivity levels of 2.6 T and 2.7 T were obtained in 6 mm thick bulk HD magnets through the addition of Nd 35 Dy 35 Cu 15 Ga 15 and Nd 35 Tb 35 Cu 15 Ga 15 alloys with low melting points of 616 °C and 605 °C, respectively, consuming only 2.2 wt.% HREs ( Figure 17 a). These results are comparable with previous studies that used almost twice the amount of HREs (~4.5 wt.%) ( Figure 17 b).…”

Section: Two Routes For High-coercivity Hot-deformed Magnetsmentioning

confidence: 99%

“…However, the decreases in the grain size and the grain aspect ratio during the DADP are significant and cannot be ignored. Therefore, comprehensive simulations were conducted to reveal the importance of various factors, including the composition of the 2:14:1 phase, the grain size, the grain aspect ratio and the nature of the grain boundary phase, with respect to the enhancement in coercivity [ 74 ]. As depicted in Figure 23 a, the design of the models involved three compositions of 2:14:1 phases (Nd 2 Fe 14 B, (Nd 0 .…”

Section: Coercivity Mechanisms Of Hot-deformed Magnetsmentioning

confidence: 99%

“…Data obtained from refs. [ 55 , 56 , 57 , 64 , 65 , 66 , 67 , 68 , 73 , 74 , 75 , 76 , 77 ]. Reproduced with permission [ 74 ].…”

Section: Figurementioning

confidence: 99%

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Significant Progress for Hot-Deformed Nd-Fe-B Magnets: A Review

et al. 2023

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High-performance Nd-Fe-B-based rare-earth permanent magnets play a crucial role in the application of traction motors equipped in new energy automobiles. In particular, the anisotropic hot-deformed (HD) Nd-Fe-B magnets prepared by the hot-press and hot-deformation process show great potential in achieving high coercivity due to their fine grain sizes of 200–400 nm, which are smaller by more than an order of magnitude compared to the traditional sintered Nd-Fe-B magnets. However, the current available coercivity of HD magnets is not as high as expected according to an empirical correlation between coercivity and grain size, only occupying about 25% of its full potential of the anisotropy field of the Nd2Fe14B phase. For the sake of achieving high-coercivity HD magnets, two major routes have been developed, namely the grain boundary diffusion process (GBDP) and the dual alloy diffusion process (DADP). In this review, the fundamentals and development of the HD Nd-Fe-B magnets are comprehensively summarized and discussed based on worldwide scientific research. The advances in the GBDP and DADP are investigated and summarized based on the latest progress and results. Additionally, the mechanisms of coercivity enhancement are discussed based on the numerous results of micromagnetic simulations to understand the structure–property relationships of the HD Nd-Fe-B magnets. Lastly, the magnetization reversal behaviors, based on the observation of magneto-optic Kerr effect microscopy, are analyzed to pinpoint the weak regions in the microstructure of the HD Nd-Fe-B magnets.

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Section: Two Routes For High-coercivity Hot-deformed Magnetsmentioning

confidence: 99%

Section: Coercivity Mechanisms Of Hot-deformed Magnetsmentioning

confidence: 99%

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Significant Progress for Hot-Deformed Nd-Fe-B Magnets: A Review

et al. 2023

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“…Conventionally, temperature stability is enhanced through introducing heavy rare-earth (HRE) elements such as Dy, Tb, etc. [3][4][5][6] The introduction of these HRE elements benets H cj greatly, especially at HT. [7][8][9][10][11][12] However, the scarcity and high cost of HRE elements lead to elevated cost, as well as lower B r in the meantime.…”

Section: Introductionmentioning

confidence: 99%

Accelerated discovery of cost-effective Nd–Fe–B magnets through adaptive learning

Chen¹,

Liu²,

Zhang³

et al. 2023

J. Mater. Chem. A

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“…2:14:1 typed Nd-Fe-B based magnetic materials were invented by Sagawa et al and Croat et al in 1984 [1][2][3] and are now widely used in various important fields such as energy, communication, medical treatment and transportation [4][5][6][7]. Nd, Pr, Dy and Tb are the most commonly used rare Earth (RE) elements in Nd-Fe-B permanent magnets, while Ce and La, the RE elements with the largest reserves in nature, are rarely used [8,9].…”

Section: Introductionmentioning

confidence: 99%

A novel coercivity enhancement method of Nd-Ce-Fe-B magnets by adjusting anisotropy field distribution and magnetostatic field distribution

Shen

Wang

et al. 2023

Phys. Scr.

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In order to give full play to the potential of Nd-Ce-Fe-B magnets and increase the coercivity of magnets with a fixed average composition, the influence of the cooperation effect of anisotropy field and magnetostatic field on their coercivity was studied. We modeled thirteen composition distributions and calculated their coercivity by micromagnetic simulations. The results show that neither the most inhomogeneous composition distribution nor the most homogeneous composition leads to the maximum coercivity. This is due to the variation in a critical field Hcritwhich quantifies the cooperation effect of anisotropy field and magnetostatic field. This work sheds new insights into further enhancing the coercivity of Nd-Ce-Fe-B magnets by subtly adjusting composition distribution, which changes the anisotropy field distribution and the magnetostatic field distribution.

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Significant enhancement in the coercivity and thermal stability of bulk hot-deformed Nd-Fe-B magnets by intergranular addition of Nd-Dy/Tb-Cu-Ga alloys

Cited by 17 publications

References 47 publications

Significant Progress for Hot-Deformed Nd-Fe-B Magnets: A Review

Significant Progress for Hot-Deformed Nd-Fe-B Magnets: A Review

Accelerated discovery of cost-effective Nd–Fe–B magnets through adaptive learning

A novel coercivity enhancement method of Nd-Ce-Fe-B magnets by adjusting anisotropy field distribution and magnetostatic field distribution

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