Microstructural evolutions, phase transformations and hard magnetic properties in polycrystalline Ce–Co–Fe–Cu alloys Author links open overlay panel

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

Microstructural evolutions, phase transformations and hard magnetic properties in polycrystalline Ce–Co–Fe–Cu alloys Author links open overlay panel

File

IS-J 10801.pdf (1.79 MB)

Date

2022-04-25

Authors

Gandha, Kinjal

Chaudhary, Rakesh P.

Kramer, Matthew J.

Ott, Ryan T.

Paudyal, Durga

Nlebedim, I.C.

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Abstract

This work focuses on systematic studies of Ce–Co based 1:5 permanent magnet alloys of CeCo4.4-xFexCu0.6 and CeCo3.9-xFexCu1.2 (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. The addition of Fe improved both the magnetization and Curie temperature via increased effective exchange interactions, while an increase in Cu content enhanced coercivity.

Series

IS-J 10801

IS-J 10904

Academic or Administrative Unit

Ames National Laboratory

Type

article

Comments

This is a manuscript of an article published as Gandha, Kinjal, Rakesh P. Chaudhary, Matthew J. Kramer, Ryan T. Ott, Durga Paudyal, and I. C. Nlebedim. "Microstructural evolutions, phase transformations and hard magnetic properties in polycrystalline Ce–Co–Fe–Cu alloys." Materials Chemistry and Physics 286 (2022): 126179. DOI: 10.1016/j.matchemphys.2022.126179. Copyright 2022 Elsevier B.V. Posted with permission. DOE Contract Number(s): AC02-07CH11358.