4.7 Article

Decomposition behavior in the early-stage oxidation of Sm2Co17-type magnets

Journal

SCRIPTA MATERIALIA
Volume 200, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.113911

Keywords

Permanent magnets; Oxidation; Decomposition; TEM

Funding

  1. Industry Alignment Fund (IAF) Singapore under the Corp-Lab@UniversityScheme

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This study investigates the decomposition process and structural changes of Sm2Co17-type permanent magnets during early-stage oxidation using aberration-corrected TEM. The findings provide insights into the initial oxidation behavior of alloys.
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 similar to 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. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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