High coercivity microcrystalline Nd-rich Nd–Fe–Co–Al–B bulk magnets prepared by direct copper mold casting

Zhao, Lizhong; Hong, Yuan; Fang, Xiaogong; Qiu, Zhaoguo; Zhong, Xichun; Gao, Xiang; Liu, Zhongwu

doi:10.1016/j.jmmm.2016.02.049

Cited by 8 publications

(2 citation statements)

References 27 publications

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“…For the x = 0 sample (Fig. 2a) without Ce substitution, as discussed in our previous work 20 , area A is represented for 2:14:1 phase, B is for Nd-rich phase while C (dark gray) for 1:4:4 phase. For the Ce-substituted alloys, according to the EDS results shown in the supplementary materials as Table S1, the ratio of rare earth Nd + Ce content over transition metal Fe + Co content (RE/TM atom ) is near to 1:7 for point A, 2:1 for point B, and 1:2 for point C, which should correspond to 2:14:1 phase, RE-rich phase, and 1:2 phase, respectively.…”

Section: Resultsmentioning

confidence: 95%

“…Here, directly cast (Nd 1−x Ce x ) 25 Fe 40 Co 20 Al 4 B 11 alloys are chosen because their grain sizes are in micrometer scale, which can be easily characterized by scanning electron microscopy and energy dispersive spectrometry. In addition, those cast alloys have high coercivities, which is beneficial for revealing the relationships between the magnetic properties and microstructures 20,21 . The present work may help to further understand the structure and magnetic properties of Ce-containing Nd-Fe-B alloys.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Understanding the element segregation and phase separation in the Ce-substituted Nd-(Fe,Co)-B based alloys

Zhao¹,

Zhang²,

Ahmed³

et al. 2018

Sci Rep

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Ce substituted Nd2Fe14B (2:14:1)-type permanent magnets have shown increasing potential in the applications due to their high properties/cost ratio. However, the element segregation and phase separation in the Ce substituted magnets have not been fully understood yet. In this work, (Nd1−xCex)25Fe40Co20Al4B11 alloys with high coercivities were prepared by copper mold casting. Based on detailed microstructure and composition analysis, the segregation of rare earth (RE) elements was observed in the as-cast alloys. Nd element prefers to enter into the 2:14:1 phase and the Ce element enter into the 1:2 phase. The existence of the 1:2 phase can promote the element segregation. The alloy shows an abnormal increase of coercivity from 641 kA/m for x = 0.2 to 863 kA/m for x = 0.3. This increase could be attributed to the phase separation of the 2:14:1 phase, which has been confirmed by the microstructural characterization. The present data provides useful information for exploring Ce-containing Nd-Fe-B magnets.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Understanding the element segregation and phase separation in the Ce-substituted Nd-(Fe,Co)-B based alloys

Zhao¹,

Zhang²,

Ahmed³

et al. 2018

Sci Rep

View full text Add to dashboard Cite

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Microstructure and Magnetic Properties of Copper Mold Cast Nd–Fe–B Magnets Investigated by Phase‐Field and Micromagnetic Simulations

Wang

Qiu

et al. 2022

Adv Eng Mater

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The effects of several factors, including alloy composition, cooling rate, and external magnetic field, on the microstructures and magnetic properties of Nd–Fe–B ternary alloy are explored in detail by using phase‐field and micromagnetic simulations during the copper mold casting process. It is found that the characteristic of regional distribution is formed due to the temperature gradient in the alloy, and that Nd19Fe71.5B9.5 (at%) exhibits the highest coercivity and pretty good comprehensive magnetic properties among all alloys studied, which can be interpreted by the refinement of Nd2Fe14B grain size and thickness of Nd‐rich grain boundary phase. The cooling rate has significant influence on the average grain size and the amount of amorphous phase. An increase of cooling rate results in a decrease of grain size and an increase of amorphous phase, which then affect the coercivity and remanence of the magnet. Applying an external magnetic field is demonstrated to be a good approach to enhance the coercivity and remanence by refining the grain size and restraining the formation of amorphous phase and T2 phase.

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High coercivity Pr2Fe14B/α-Fe nanocomposite permanent magnets with Zr addition

2019

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High coercivity microcrystalline Nd-rich Nd–Fe–Co–Al–B bulk magnets prepared by direct copper mold casting

Cited by 8 publications

References 27 publications

Understanding the element segregation and phase separation in the Ce-substituted Nd-(Fe,Co)-B based alloys

Understanding the element segregation and phase separation in the Ce-substituted Nd-(Fe,Co)-B based alloys

Microstructure and Magnetic Properties of Copper Mold Cast Nd–Fe–B Magnets Investigated by Phase‐Field and Micromagnetic Simulations

High coercivity Pr2Fe14B/α-Fe nanocomposite permanent magnets with Zr addition

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