High performance Nd-Fe-B permanent magnets without critical elements

Pathak, Arjun K.; Gschneidner, Jr., K. A.; Khan, M.; McCallum, R. W.; Pecharsky, V. K.

doi:10.1016/j.jallcom.2016.01.194

Title: High performance Nd-Fe-B permanent magnets without critical elements

Journal Article · Thu Jan 28 00:00:00 EST 2016 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2016.01.194· OSTI ID:1245625

Pathak, Arjun K. ^[1]; Gschneidner, Jr., K. A. ^[1]; Khan, M. ^[1]; McCallum, R. W. ^[1]; Pecharsky, V. K. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)

Scanning electron microscopy, and magnetization measurements reveal that as cast (Nd_1–xCe_x)₂Fe₁₄B alloys contain significant amounts of α-Fe that can be dramatically reduced by annealing the alloys at 1000 °C for 3 days. The room temperature intrinsic coercivity, Hci, of (Nd_0.8Ce_0.2)_2.2Fe₁₄B melt spun ribbons was found to be 11 kOe, which is ~32 to ~10% higher in comparison to that of Nd₂Fe₁₄B (Hci = 8.3 kOe), and (Nd_0.8Ce_0.2)_2.0Fe₁₄B (Hci = 10 kOe), respectively. The substitution of Co for Fe in (Nd_0.8Ce_0.2)₂Fe_14–zCo_zB significantly increases both TC and the maximum energy product, (BH)max. Our study shows that both Co-containing and Co-free Ce-substituted Nd₂Fe₁₄B alloys have excellent magnetic properties at room temperature and above. As a result, the experimental results also demonstrate the potential of Nd-Ce-Fe-TM-B based alloys as alternative to expensive Dy-containing high performance rare earth magnets.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1245625

Alternate ID(s):: OSTI ID: 1359229

Report Number(s):: IS-J-8915; PII: S0925838816301955

Journal Information:: Journal of Alloys and Compounds, Vol. 668, Issue C; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 43 works

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Cited By (4)

Microstructure and magnetic properties of sintered Nd–Fe–B magnets with Ce substitution for Nd by intergranular-alloy method Huang, Jian-Xin; Liu, Ying; Li, Jun Rare Metals, Vol. 39, Issue 1 https://doi.org/10.1007/s12598-019-01272-9	journal	July 2019
Single-Crystal Permanent Magnets: Extraordinary Magnetic Behavior in the $Ta$ -, $Cu$ -, and $Fe$ -Substituted ${Ce Co}_{5}$ Systems Lamichhane, Tej N.; Onyszczak, Michael T.; Palasyuk, Olena Physical Review Applied, Vol. 11, Issue 1 https://doi.org/10.1103/physrevapplied.11.014052	journal	January 2019
Rare Earths and the Balance Problem: How to Deal with Changing Markets? Binnemans, Koen; Jones, Peter Tom; Müller, Torsten Journal of Sustainable Metallurgy, Vol. 4, Issue 1 https://doi.org/10.1007/s40831-018-0162-8	journal	February 2018
Understanding the element segregation and phase separation in the Ce-substituted Nd-(Fe,Co)-B based alloys Zhao, L. Z.; Zhang, J. S.; Ahmed, G. Scientific Reports, Vol. 8, Issue 1 https://doi.org/10.1038/s41598-018-25230-0	journal	May 2018

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36 MATERIALS SCIENCE
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Title: High performance Nd-Fe-B permanent magnets without critical elements

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