Preparation and magnetic hardening of low Ti content (Sm,Zr)(Fe,Co,Ti)12 magnets by rapid solidification non-equilibrium method

doi:10.1088/1674-1056/ad58c4

Abstract The Sm-Zr-Fe-Co-Ti quinary-alloys with ThMn$_{12}$ structure has attracted wide attention for ultra-high intrinsic magnetic properties, showing potentiality to be developed into rare-earth permanent magnets. The Ti element in alloys is crucial for phase stability and magnetic properties, and lower Ti content can increase intrinsic magnetic properties but reduce phase stability. In this study, the 1:12 single-phase melt-spun ribbons with low Ti content was successfully prepared using a rapid solidification non-equilibrium method for the Sm$_{1.1}$Zr$_{0.2}$Fe$_{9.2}$Co$_{2.3}$Ti$_{0.5}$ quinary-alloy. However, this non-equilibrium ribbon did not achieve good magnetic hardening due to the uneven microstructure and microstrain. Then, annealing was carried out to eliminate micro-strain and homogenize microstructure, therefore, remanence and coercivity were significantly improved even the precipitation of a small amount of $\alpha $-Fe phase which were not conducive to coercivity. The remanence of 86.1 emu/g and coercivity of 151 kA/m was achieved when annealing at 850 ${^\circ}$C for 45 min. After hot pressing, under the action of high temperature and pressure, a small portion of ThMn$_{12}$ phases in the magnet decompose into Sm-rich phases and $\alpha $-Fe, while remanence of 4.02 kGs (1 Gs = 10$^{-4}$ T), and coercivity of 1.12 kOe (1 Oe = 79.5775 A$\cdot$m$^{-1}$) were still acquired. Our findings can provide reference for exploring practical permanent magnets made of 1:12 type quinary-alloys.

Keywords: magnetic materials (Sm,Zr)(Fe,Co,Ti)$_{12}$ magnets nanocrystalline magnet microstructure

Received: 01 March 2024
Revised: 30 May 2024
Accepted manuscript online: 17 June 2024

PACS:	75.50.Ww	(Permanent magnets)
	75.75.-c	(Magnetic properties of nanostructures)
	75.75.Cd	(Fabrication of magnetic nanostructures)

Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2021YFB3500300), the National Natural Science Foundation of China (Grant No. 51931007), and the Program of Top Disciplines Construction in Beijing (Grant No. PXM2019 014204 500031).

Corresponding Authors: Yu-Qing Li, Ming Yue
E-mail: yqli@bjut.edu.cn;yueming@bjut.edu.cn

Cite this article:

Xing-Feng Zhang(张兴凤), Li-Bin Liu(刘立斌), Yu-Qing Li(李玉卿), Dong-Tao Zhang(张东涛), Wei-Qiang Liu(刘卫强), and Ming Yue(岳明) Preparation and magnetic hardening of low Ti content (Sm,Zr)(Fe,Co,Ti)₁₂ magnets by rapid solidification non-equilibrium method 2024 Chin. Phys. B 33 097503

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Preparation and magnetic hardening of low Ti content (Sm,Zr)(Fe,Co,Ti)12 magnets by rapid solidification non-equilibrium method

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Preparation and magnetic hardening of low Ti content (Sm,Zr)(Fe,Co,Ti)₁₂ magnets by rapid solidification non-equilibrium method