Microstructural evolutions, phase transformations and hard magnetic properties in polycrystalline Ce–Co–Fe–Cu alloys

Gandha, Kinjal; Chaudhary, Rakesh P.; Kramer, Matthew J.; Ott, Ryan T.; Paudyal, Durga; Nlebedim, I. C.

doi:10.1016/j.matchemphys.2022.126179

Title: Microstructural evolutions, phase transformations and hard magnetic properties in polycrystalline Ce–Co–Fe–Cu alloys

Journal Article · Mon Apr 25 00:00:00 EDT 2022 · Materials Chemistry and Physics

DOI:https://doi.org/10.1016/j.matchemphys.2022.126179· OSTI ID:1875251

Gandha, Kinjal ^[1];

^[1];

^[1]; Ott, Ryan T. ^[1];

^[1];

^[1]

Ames Laboratory, Ames, IA (United States)

This work focuses on systematic studies of Ce–Co based 1:5 permanent magnet alloys of CeCo_4.4-xFe_xCu_0.6 and CeCo_3.9-xFe_xCu_1.2 (x = 0, 0.3, 0.6, 0.9, 1.2, 1.8) by varying Co:Fe. The overarching aim of this manuscript is to elucidate the hard-magnetic properties through a better understanding of phase formation by the structural, microstructural, and magnetic properties in these materials. Improved mutual solubility of Fe in the 1:5 phase has been observed with an extended homogeneity range by Cu substitution. For both composition series, Fe contents of x ≤ 0.6 show a homogeneous microstructure with a single 1:5 phase and good magnetic properties. The composition region 0.6 < x ≤ 0.9 appears to be near the boundary of solubility and evolution of other phases. At x = 1.8, it is found that the homogeneous 1:5 phase and magnetic hardness deteriorated due to the evolution of secondary phases such as 2:17, 2:7, and Fe–Co. Furthermore, the addition of Fe improved both the magnetization and Curie temperature via increased effective exchange interactions, while an increase in Cu content enhanced coercivity.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1875251

Alternate ID(s):: OSTI ID: 1890190

Report Number(s):: IS-J-10,801; IS-J-10,904

Journal Information:: Materials Chemistry and Physics, Vol. 286; ISSN 0254-0584

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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