Structure and magnetic properties of Sm15Co70−xFe10B5Alx ribbons

[Display omitted] •The amorphous Sm-Co-Al alloys are designed by means of cluster lines.•Al addition alters the crystallization processes of Sm15Co70−xFe10B5Alx ribbons.•The maximum coercivity of 15409.0 ± 2075.2 Oe is achieved in x = 15 ribbons.•The strong pinning effect contributes to the high coe...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2019-11, Vol.489, p.165450, Article 165450
Main Authors: Duan, Xiu-Li, Sun, Ji-Bing, Wang, Li-Zhu, Guo, Kai, Cui, Chun-Xiang
Format: Article
Language:English
Subjects:
Aluminum
Amorphous materials
Coercivity
Crystallization
Magnetic measurements
Magnetic properties
Melt spinning
Microstructure
Nanocrystals
Nucleation
Permanent magnet
Phase transitions
Pinning
Rapid solidification
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Summary:[Display omitted] •The amorphous Sm-Co-Al alloys are designed by means of cluster lines.•Al addition alters the crystallization processes of Sm15Co70−xFe10B5Alx ribbons.•The maximum coercivity of 15409.0 ± 2075.2 Oe is achieved in x = 15 ribbons.•The strong pinning effect contributes to the high coercivity.•Proposed a model of composition, microstructure and magnetic mechanism. This paper focuses on the phase transition, microstructure and magnetic properties of amorphous-nanocrystalline Sm15Co70−xFe10B5Alx (x = 0, 5, 10, 15, 20) ribbons melt-spun at a speed of 40 m/s. The results show that the five ribbons are all composed of a high content of amorphous and several nanocrystalline phases, and these crystalline ones are Sm(Co,M)7 main phase and minor phases including Sm2(Co,M)7, Sm2Co7B3, Co72Fe28, etc. Al addition alters the crystallization processes of different ribbons, particularly, a uniform cellular microstructure is formed in x = 15 ribbons which win the maximum coercivity of 15,409.0 ± 2075.2 Oe. The coercivity of five ribbons is first dominated by the nucleation mechanism, and then the pinning mechanism. The strong pinning effect, stemmed from a combination of uniform cellular microstructure, high volume ratio of cell-walls, high solubility of Al in the Sm(Co,M)7 and the multiphase interfaces in the wide cell walls, is the main reason for the high coercivity. Finally, the relational models among composition, microstructure and magnetic mechanism were established.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.165450