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

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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The Sm-Zr-Fe-Co-Ti quinary-alloys with ThMn12 structure has attracted wide attention for ultra-high intrinsic mag-netic 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 Sm1.1Zr0.2Fe9.2C02.3Tio.5 quinary-alloy.However,this non-equilibrium rib-bon 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 im-proved even the precipitation of a small amount of α-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 ℃ for 45 min.After hot pressing,under the action of high temperature and pressure,a small portion of ThMn12 phases in the magnet decompose into Sm-rich phases and α-Fe,while remanence of 4.02 kGs(1 Gs=10-4 T),and coercivity of 1.12 kOe(1 Oe=79.5775 A·m-1)were still acquired.Our findings can provide reference for exploring practical permanent magnets made of 1∶12 type quinary-alloys.

magnetic materials(SmZr)(FeCoTi)12 magnetsnanocrystalline magnetmicrostructure

张兴凤、刘立斌、李玉卿、张东涛、刘卫强、岳明

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College of Materials Science and Engineering,Key Laboratory of Advanced Functional Materials,Ministry of Education of China,Beijing University of Technology,Beijing 100124,China

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaProgram of Top Disciplines Construction in Beijing

2021YFB350030051931007PXM2019_014204_500031

2024

10.1088/1674-1056/ad58c4

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(9)