Synthesis, microstructure and magnetic properties of low Nd content Fe 90Nd 5B 3.5M 1.5 (M = Hf, Ti and Ta) alloys

Zeqiang Zhang; Parmanand Sharma; Kunio Yubuta; Akihiro Makino

doi:10.1063/1.3670509

Synthesis, microstructure and magnetic properties of low Nd content Fe ₉₀Nd ₅B _3.5M _1.5 (M = Hf, Ti and Ta) alloys

Zeqiang Zhang, Parmanand Sharma, Kunio Yubuta, Akihiro Makino

HOSP - Sense Organs and Rehabilitation Medicine

Tohoku University

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

7 Citations (Scopus)

Abstract

We have investigated the effects of Hf, Ti and Ta addition on crystallization behavior, microstructure and magnetic properties of melt-spun Fe ₉₀Nd ₅B _3.5M _1.5 (M Hf, Ti and Ta) alloy ribbons. Optimization of processing conditions lead to the development of nano-composite magnets, made from high B _s soft magnetic bcc α-Fe (grain size ∼20 nm) and tetragonal Nd ₂Fe ₁₄B (grain size ∼18 nm) hard magnetic phases. Hf is most effective in restraining the growth of α-Fe and Nd ₂Fe ₁₄B phases during annealing. The Fe ₉₀Nd ₅B _3.5Hf _1.5 ribbon annealed at 1003 K for 600 s exhibits very high maximum energy product (BH) _max ∼127 kJ/m ³ and reduced remanence ∼1.34 T. Strong exchange coupling among the nano-sized soft and hard magnetic phases is shown to be responsible for the excellent magnetic properties. Among low Nd-containing NdFeB nano-composite magnets, the present alloy seems to have highest (BH) _max.

Original language	English
Article number	07B501
Journal	Journal of Applied Physics
Volume	111
Issue number	7
DOIs	https://doi.org/10.1063/1.3670509
Publication status	Published - 2012 Apr 1

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title = "Synthesis, microstructure and magnetic properties of low Nd content Fe 90Nd 5B 3.5M 1.5 (M = Hf, Ti and Ta) alloys",

abstract = "We have investigated the effects of Hf, Ti and Ta addition on crystallization behavior, microstructure and magnetic properties of melt-spun Fe 90Nd 5B 3.5M 1.5 (M Hf, Ti and Ta) alloy ribbons. Optimization of processing conditions lead to the development of nano-composite magnets, made from high B s soft magnetic bcc α-Fe (grain size ∼20 nm) and tetragonal Nd 2Fe 14B (grain size ∼18 nm) hard magnetic phases. Hf is most effective in restraining the growth of α-Fe and Nd 2Fe 14B phases during annealing. The Fe 90Nd 5B 3.5Hf 1.5 ribbon annealed at 1003 K for 600 s exhibits very high maximum energy product (BH) max ∼127 kJ/m 3 and reduced remanence ∼1.34 T. Strong exchange coupling among the nano-sized soft and hard magnetic phases is shown to be responsible for the excellent magnetic properties. Among low Nd-containing NdFeB nano-composite magnets, the present alloy seems to have highest (BH) max.",

author = "Zeqiang Zhang and Parmanand Sharma and Kunio Yubuta and Akihiro Makino",

note = "Funding Information: This work was supported by Global COE Program “Materials Integration (International Center of Education and Research), Tohoku University,” MEXT, Japan.",

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doi = "10.1063/1.3670509",

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T1 - Synthesis, microstructure and magnetic properties of low Nd content Fe 90Nd 5B 3.5M 1.5 (M = Hf, Ti and Ta) alloys

AU - Zhang, Zeqiang

AU - Sharma, Parmanand

AU - Yubuta, Kunio

AU - Makino, Akihiro

N1 - Funding Information: This work was supported by Global COE Program “Materials Integration (International Center of Education and Research), Tohoku University,” MEXT, Japan.

PY - 2012/4/1

Y1 - 2012/4/1

N2 - We have investigated the effects of Hf, Ti and Ta addition on crystallization behavior, microstructure and magnetic properties of melt-spun Fe 90Nd 5B 3.5M 1.5 (M Hf, Ti and Ta) alloy ribbons. Optimization of processing conditions lead to the development of nano-composite magnets, made from high B s soft magnetic bcc α-Fe (grain size ∼20 nm) and tetragonal Nd 2Fe 14B (grain size ∼18 nm) hard magnetic phases. Hf is most effective in restraining the growth of α-Fe and Nd 2Fe 14B phases during annealing. The Fe 90Nd 5B 3.5Hf 1.5 ribbon annealed at 1003 K for 600 s exhibits very high maximum energy product (BH) max ∼127 kJ/m 3 and reduced remanence ∼1.34 T. Strong exchange coupling among the nano-sized soft and hard magnetic phases is shown to be responsible for the excellent magnetic properties. Among low Nd-containing NdFeB nano-composite magnets, the present alloy seems to have highest (BH) max.

AB - We have investigated the effects of Hf, Ti and Ta addition on crystallization behavior, microstructure and magnetic properties of melt-spun Fe 90Nd 5B 3.5M 1.5 (M Hf, Ti and Ta) alloy ribbons. Optimization of processing conditions lead to the development of nano-composite magnets, made from high B s soft magnetic bcc α-Fe (grain size ∼20 nm) and tetragonal Nd 2Fe 14B (grain size ∼18 nm) hard magnetic phases. Hf is most effective in restraining the growth of α-Fe and Nd 2Fe 14B phases during annealing. The Fe 90Nd 5B 3.5Hf 1.5 ribbon annealed at 1003 K for 600 s exhibits very high maximum energy product (BH) max ∼127 kJ/m 3 and reduced remanence ∼1.34 T. Strong exchange coupling among the nano-sized soft and hard magnetic phases is shown to be responsible for the excellent magnetic properties. Among low Nd-containing NdFeB nano-composite magnets, the present alloy seems to have highest (BH) max.

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Synthesis, microstructure and magnetic properties of low Nd content Fe ₉₀Nd ₅B _3.5M _1.5 (M = Hf, Ti and Ta) alloys

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