Misorientations across boundary planes in a sintered NdFeB permanent magnet

Xiu-gan, Yuan; Zhu, Jianguo

doi:10.1039/d2ra01670b

Cited by 2 publications

(1 citation statement)

References 54 publications

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“…But lattice mismatches induced by additional elements can cause distortions of the Nd2Fe14B unit cell, which depend on the composition and orientation of the second phase [5] . Distortions at the interfaces between Nd2Fe14B and Nd-rich phases can be > 1 nm [5] , which could be referred to as the redistribution of surface energy [62] . These distortions can influence magnetic properties if they reduce the magnetocrystalline anisotropy of the Nd2Fe14B unit cell, which is known for Nd-rich and oxide Nd2O3 grains.…”

Section: Figure 4 Analysis Of the Chemical Composition And Distributi...mentioning

confidence: 99%

Influence of silver nanoparticle additivation on Nd-Fe-B permanent magnets produced by Laser Powder Bed Fusion

Gabriel

Liu

Staab

et al. 2023

Preprint

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Powder bed fusion of metals using a laser beam (PBF-LB/M) is an established additive manufacturing (AM) method that can be used to fabricate geometrically complex NdFe-B magnets. However, the magnetic properties of Nd-Fe-B magnets manufactured by PBF-LB/M are typically inferior to conventionally produced magnets. To overcome this drawback, we modified the surface of the permanent magnet feedstock powder with 1 wt.% surfactant-free Ag nanoparticles (NPs) supporting the formation of relevant phases required for permanent magnetic performance to achieve a suitable micro- and nanostructure after AM. Our study is accompanied by finite element simulations, revealing the impact and dependency of process parameters during PBF-LB/M: a wide temperature field with a high-gradient profile in the front and on the bottom of an overheated region, implying a vast local heating/cooling rate and in-process high thermal stress. We found experimentally that the as-built part density can be affected by both the laser power and scan speed, causing a reduction in density as both parameters increase. The functionality and microstructural properties are also investigated via VSM, HR-SEM, EDX, EBSD, and exemplarily with HR-TEM-EDX and APT. Our study found that modifying MQP-S with Ag NPs increases the coercivity by approximately 20%, which we correlate to a decreased grain size. Additionally, we identified three distinct phases in the modified and unmodified samples, where Ag is primarily found in the intergranular and Nd-rich phases of the as-built parts. Overall, the study's findings contribute to the understanding of the factors that affect the quality and magnetic properties of Nd-Fe-B magnets fabricated through PBF-LB/M and provide valuable insights for further research in this area.

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Section: Figure 4 Analysis Of the Chemical Composition And Distributi...mentioning

confidence: 99%

Influence of silver nanoparticle additivation on Nd-Fe-B permanent magnets produced by Laser Powder Bed Fusion

Gabriel

Liu

Staab

et al. 2023

Preprint

View full text Add to dashboard Cite

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Deep learning and correlative microscopy for quantification of grain orientation in sintered FeNdB-type permanent magnets by domain pattern analysis

Choudhary,

Grubesa,

Jansche

et al. 2024

Acta Materialia

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Misorientations across boundary planes in a sintered NdFeB permanent magnet

Abstract: Misorientation angle statistics for the specimen, with a red line for Nd2Fe14B/Nd2Fe14B grain boundaries, blue line for Nd2Fe14B/Nd-Rich phase boundaries, and black line for the randomly oriented case.

Cited by 2 publications

References 54 publications

Influence of silver nanoparticle additivation on Nd-Fe-B permanent magnets produced by Laser Powder Bed Fusion

Influence of silver nanoparticle additivation on Nd-Fe-B permanent magnets produced by Laser Powder Bed Fusion

Deep learning and correlative microscopy for quantification of grain orientation in sintered FeNdB-type permanent magnets by domain pattern analysis

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