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Journal of Materials Science
Published in: Journal of Materials Science 3/2019

12-10-2018 | Metals

Microstructure and magnetic properties of SmCo7/Co nanocomposite powders prepared by mechanical alloying

Authors: Yilong Ma, Xueguo Yin, Bin Shao, Qiqi Yang, Qian Shen, Xiaoqing Zhou, Jianchun Sun, Dongling Guo, Kejian Li

Published in: Journal of Materials Science | Issue 3/2019

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Abstract

SmCo7/Co nanocomposite powders were prepared by high-energy ball milling of SmCo5 modified by adding Co and annealed at different temperatures. The phase evolution, microstructure and magnetic properties of the nanocomposite powders were analyzed. The results have shown that the annealing temperature and the addition of Co significantly affected the phase structures and magnetic properties of the powders. The nanocomposite powders were completely composed of the SmCo7 phase and the face-centered cubic Co phase. When annealing the SmCo5 powder at 750 °C, the SmCo7 phase decomposed into Th2Zn17-type Sm2Co17 and CaCu5-type SmCo5 phases with an average grain size of 13.9 nm, and the maximum energy product and remanence had maximum values of 10.51 MGOe and 77.92 emu/g, respectively. However, adding 28 wt% Co effectively prevented growth of the grain (11.5 nm) and enhanced the decomposition temperature (850 °C), resulting in a higher maximum magnetic energy product, coercivity, and remanence. The SmCo7 lattice contracted as Co content increased.
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Metadata
Title
Microstructure and magnetic properties of SmCo7/Co nanocomposite powders prepared by mechanical alloying
Authors
Yilong Ma
Xueguo Yin
Bin Shao
Qiqi Yang
Qian Shen
Xiaoqing Zhou
Jianchun Sun
Dongling Guo
Kejian Li
Publication date
12-10-2018
Publisher
Springer US
Published in
Journal of Materials Science / Issue 3/2019
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-018-2989-6

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