Isotropic nanocrystalline Sm(Fe,Co)11.3Ti0.7 magnets modified with B and Zr

Gabay, Alexander M.; Hadjipanayis, George C.

doi:10.1016/j.jmmm.2021.167867

Isotropic nanocrystalline Sm(Fe,Co)_11.3Ti_0.7 magnets modified with B and Zr

Journal Article · Tue Mar 02 00:00:00 EST 2021 · Journal of Magnetism and Magnetic Materials

DOI:https://doi.org/10.1016/j.jmmm.2021.167867· OSTI ID:1768192

^[1]; Hadjipanayis, George C. ^[2]

Univ. of Delaware, Newark, DE (United States); University of Delaware
Univ. of Delaware, Newark, DE (United States)

Rare-earth-lean Sm(Fe,Co,Ti)₁₂ alloys with the ThMn₁₂ crystal structure and less than one Ti atom per formula unit have the potential of exceptionally powerful permanent magnets, but all prior attempts to develop high coercivity in bulk alloys, especially coercivity combined with crystallographic texture, have fallen short of the expectations. This study was aimed at improvement of the currently best Sm(Fe,Co,Ti)₁₂ magnets prepared through melt-spinning which are inherently isotropic. Modifications of the alloys with B and Zr, already demonstrated in earlier studies to be effective separately, have been implemented simultaneously. Here, a systematic study of Sm_1.1-x(Fe,Co)_11.3-yTi_0.7B_y alloys melt-spun at a tangential speed of 50 m/s and annealed at 600–950 °C allowed for monitoring the continuous evolution of the two consecutive crystal structures, those of the TbCu₇ and ThMn₁₂ types. Zirconium was found to facilitate the formation of the 1:12 structure at the expense of the 1:7, whereas boron has the opposite effect, at certain concentrations completely suppressing the 1:12. When the two alloying elements are introduced simultaneously, they inhibit growth of the 1:12 crystallites at annealing temperatures higher than 800 °C, thus allowing for the development of a higher coercivity. Because of instrumental limitations, bulk magnets were prepared through a two-step process – compaction of the melt-spun ribbons at 650 °C and additional treatment at a higher temperature – and they were characterized by a reduced, 90–93%, density. Nevertheless, an isotropic Sm_0.9Zr_0.2(Fe,Co)_10.8Ti_0.7B_0.5 magnet exhibited fair values of the remanence (7.4 kG), maximum energy product (8.5 MGOe) and coercivity (5.4 kOe), as well as high Curie temperature of 525 °C and remarkably small temperature coefficient of the coercivity, -0.25%/°C.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Delaware, Newark, DE (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-90ER45413

OSTI ID:: 1768192

Alternate ID(s):: OSTI ID: 1862582

Journal Information:: Journal of Magnetism and Magnetic Materials, Journal Name: Journal of Magnetism and Magnetic Materials Vol. 529; ISSN 0304-8853

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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