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Title: Decomposition behavior in the early-stage oxidation of Sm2Co17-type magnets
Authors: Zhang, Yong
Cao, Xun
Tan, Huiteng
Gill, Vincent
Lambourne, Alexis
Yan, Alex Qingyu
Huang, Yizhong
Keywords: Engineering::Materials
Issue Date: 2021
Source: Zhang, Y., Cao, X., Tan, H., Gill, V., Lambourne, A., Yan, A. Q. & Huang, Y. (2021). Decomposition behavior in the early-stage oxidation of Sm2Co17-type magnets. Scripta Materialia, 200, 113911-.
Journal: Scripta Materialia
Abstract: Irredeemable magnetic loss caused by oxidation remains a critical concern for the application of Sm2Co17-type permanent magnets. Herein, oxygen induced decomposition in the early-stage oxidation of a Sm(CobalFe23.5Cu4.9Zr1.7)7.5 magnet is studied using aberration-corrected TEM. Upon oxygen penetration along the 1:3R Z-plates, the 1:5H cell boundaries are decomposed into separate Sm and Co(Fe) lamellae with thicknesses of ~5 nm. Subsequently, the Fe-rich 2:17R cells are decomposed into similar metal lamellae. Besides the normal hexagonal stacking, the Sm lamellae also exhibit a twinned face-centered cubic (FCC) structure. The decomposed Co(Fe) lamellae and Cu particles are FCC-structured. The nano-twinned Cu particles are sparsely distributed. Interestingly, the closely-packed planes of these metal lamellae tend to align with the {0001}2:17R plane. The metal lamellae enriched with oxygen interstitials finally turn into nano-oxides by oxidation. This work offers in-depth insights into the initial oxidation behavior of alloys.
ISSN: 1359-6462
DOI: 10.1016/j.scriptamat.2021.113911
Rights: © 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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