Structure and magnetic properties of alnico 8 ribbons

Alnico 8 ribbons were prepared by melt-spinning and annealing, and the effects of melt-spinning speeds on the structure and magnetic properties were investigated. The results show that all the as-spun ribbons are composed of the α-Fe(Co)-type α1 and the AlNi-type α2. With speed reducing from 40 m/s...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2020-11, Vol.597, p.412423, Article 412423
Main Authors: Zhang, Shuo-Dong, Wang, Shu, Chen, Si-Yi, Yu, Xue, Sun, Ji-Bing
Format: Article
Language:English
Subjects:
Domain structure
Magnetic properties
Microstructure
Permanent magnets
Phase transitions
Rapid-solidification
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Summary:Alnico 8 ribbons were prepared by melt-spinning and annealing, and the effects of melt-spinning speeds on the structure and magnetic properties were investigated. The results show that all the as-spun ribbons are composed of the α-Fe(Co)-type α1 and the AlNi-type α2. With speed reducing from 40 m/s to 15 m/s, the preferred orientation enhanced, the grain size and the α2 content increased. The as-spun ribbons show the weak hard magnetic properties. Annealing improves the spinodal structure consisting of the strip-like α1 and α2. The annealed ribbons melt-spun at 15 m/s achieve the optimal magnetic properties with the coercivity of 1558.3 Oe and the maximum magnetic polarisation density of 11.3 kGs, which are codetermined by the shape anisotropy of the strip-like α1 phase and the pinning mechanism of the α2 phase to the α1 domains.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2020.412423