Fabrication of crack-free Nd-Fe-B magnets with laser powder bed fusion

Wei You Jhang Jian; Chung Wei Cheng; Wen Cheng Chang; Ta Yu Huang; Yan Cheng Liang; An Chen Lee; Tsung Wei Chang; Mi Ching Tsai

doi:10.1016/j.mtla.2022.101351

Fabrication of crack-free Nd-Fe-B magnets with laser powder bed fusion

Wei You Jhang Jian, Chung Wei Cheng, Wen Cheng Chang, Ta Yu Huang, Yan Cheng Liang, An Chen Lee, Tsung Wei Chang, Mi Ching Tsai

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Laser powder bed fusion (LPBF) technology is a novel approach for the fabrication of neodymium, iron, and boron (Nd-Fe-B) hard magnets. However, cracks were always observed in the LPBF-fabricated Nd-Fe-B due to the brittle characteristics of the Nd-Fe-B material. This study investigated the mixed powder composition and laser focus position, which were used to prevent cracks on LPBF-fabricated Nd-Fe-B magnets. The Nd-Fe-B magnetic powder (MQP-S) was mixed with low melting point alloy powder (Pr₂₅Nd₇₅)₇₀Cu₃₀. LPBF used to melt and solidify the mixed powder rapidly allows refinement of the grain boundary in the melt pool area. Furthermore, through the defocusing of the laser beam, the melt pool can penetrate a deeper position, and the cracks generated in the previous layers can be remelted. The mixed powder and defocus laser beam produced the maximum magnetic energy of 55.7 kJ/m³ with a crack ratio of 1.05%.

Original language	English
Article number	101351
Journal	Materialia
Volume	21
DOIs	https://doi.org/10.1016/j.mtla.2022.101351
Publication status	Published - 2022 Mar

All Science Journal Classification (ASJC) codes

General Materials Science

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10.1016/j.mtla.2022.101351

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title = "Fabrication of crack-free Nd-Fe-B magnets with laser powder bed fusion",

abstract = "Laser powder bed fusion (LPBF) technology is a novel approach for the fabrication of neodymium, iron, and boron (Nd-Fe-B) hard magnets. However, cracks were always observed in the LPBF-fabricated Nd-Fe-B due to the brittle characteristics of the Nd-Fe-B material. This study investigated the mixed powder composition and laser focus position, which were used to prevent cracks on LPBF-fabricated Nd-Fe-B magnets. The Nd-Fe-B magnetic powder (MQP-S) was mixed with low melting point alloy powder (Pr25Nd75)70Cu30. LPBF used to melt and solidify the mixed powder rapidly allows refinement of the grain boundary in the melt pool area. Furthermore, through the defocusing of the laser beam, the melt pool can penetrate a deeper position, and the cracks generated in the previous layers can be remelted. The mixed powder and defocus laser beam produced the maximum magnetic energy of 55.7 kJ/m3 with a crack ratio of 1.05%.",

author = "Jian, {Wei You Jhang} and Cheng, {Chung Wei} and Chang, {Wen Cheng} and Huang, {Ta Yu} and Liang, {Yan Cheng} and Lee, {An Chen} and Chang, {Tsung Wei} and Tsai, {Mi Ching}",

note = "Funding Information: This work was supported by the Ministry of Science and Technology of the Republic of China, under Contract MOST 109–2218-E-006–034 and 110–2218-E-006–028. Funding Information: This work was supported by the Ministry of Science and Technology of the Republic of China, under Contract MOST 109?2218-E-006?034 and 110?2218-E-006?028. Publisher Copyright: {\textcopyright} 2022 Acta Materialia Inc.",

year = "2022",

month = mar,

doi = "10.1016/j.mtla.2022.101351",

language = "English",

volume = "21",

journal = "Materialia",

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AU - Jian, Wei You Jhang

AU - Cheng, Chung Wei

AU - Chang, Wen Cheng

AU - Huang, Ta Yu

AU - Liang, Yan Cheng

AU - Lee, An Chen

AU - Chang, Tsung Wei

AU - Tsai, Mi Ching

N1 - Funding Information: This work was supported by the Ministry of Science and Technology of the Republic of China, under Contract MOST 109–2218-E-006–034 and 110–2218-E-006–028. Funding Information: This work was supported by the Ministry of Science and Technology of the Republic of China, under Contract MOST 109?2218-E-006?034 and 110?2218-E-006?028. Publisher Copyright: © 2022 Acta Materialia Inc.

PY - 2022/3

Y1 - 2022/3

N2 - Laser powder bed fusion (LPBF) technology is a novel approach for the fabrication of neodymium, iron, and boron (Nd-Fe-B) hard magnets. However, cracks were always observed in the LPBF-fabricated Nd-Fe-B due to the brittle characteristics of the Nd-Fe-B material. This study investigated the mixed powder composition and laser focus position, which were used to prevent cracks on LPBF-fabricated Nd-Fe-B magnets. The Nd-Fe-B magnetic powder (MQP-S) was mixed with low melting point alloy powder (Pr25Nd75)70Cu30. LPBF used to melt and solidify the mixed powder rapidly allows refinement of the grain boundary in the melt pool area. Furthermore, through the defocusing of the laser beam, the melt pool can penetrate a deeper position, and the cracks generated in the previous layers can be remelted. The mixed powder and defocus laser beam produced the maximum magnetic energy of 55.7 kJ/m3 with a crack ratio of 1.05%.

AB - Laser powder bed fusion (LPBF) technology is a novel approach for the fabrication of neodymium, iron, and boron (Nd-Fe-B) hard magnets. However, cracks were always observed in the LPBF-fabricated Nd-Fe-B due to the brittle characteristics of the Nd-Fe-B material. This study investigated the mixed powder composition and laser focus position, which were used to prevent cracks on LPBF-fabricated Nd-Fe-B magnets. The Nd-Fe-B magnetic powder (MQP-S) was mixed with low melting point alloy powder (Pr25Nd75)70Cu30. LPBF used to melt and solidify the mixed powder rapidly allows refinement of the grain boundary in the melt pool area. Furthermore, through the defocusing of the laser beam, the melt pool can penetrate a deeper position, and the cracks generated in the previous layers can be remelted. The mixed powder and defocus laser beam produced the maximum magnetic energy of 55.7 kJ/m3 with a crack ratio of 1.05%.

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Fabrication of crack-free Nd-Fe-B magnets with laser powder bed fusion

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