Abstract
To develop low-cost, high-performance light rare earth element (LRE)-substituted Nd–Fe–B permanent magnets, we systematically studied the effect of substituting Nd with 20% light rare earth elements (LRE = Ce, Y, and La) on the hard magnetic properties of (Nd0.8LRE0.2)–Fe–B hot-deformed magnets. The (Nd0.8Ce0.2)2Fe14B magnet showed a coercivity of μ0Hc = 1.41 T, which is comparable to that of an LRE-free magnet. Y substitution was found to decrease μ0Hc and μ0Mr to 1.22 and 1.32 T, respectively, as was expected from the intrinsic properties of (Nd0.8Y0.2)2Fe14B. Unlike our expectation, the thermal stability of coercivity is not degraded by the Y substitution, demonstrating its potential for elevated temperature applications. With La substitution, coercivity is substantially degraded to 0.67 T because of the low intrinsic properties and the lack of the intergranular phase. The Y and Ce co-substituted (Nd0.8Ce0.1Y0.1)2Fe14B hot-deformed magnets showed better thermal stability of coercivity compared to the (Nd0.8Ce0.2)2Fe14B sample.
Highlights
The intrinsic properties of Ce2Fe14B (μ0HA = 2.6 T, μ0Ms = 1.17 T, and Tc = 424 K), La2Fe14B (μ0HA = 2.0 T, μ0Ms = 1.38 T, and Tc = 530 K), and Y2Fe14B (μ0HA = 2.6 T, μ0Ms = 1.41 T, and Tc = 565 K) are inferior to those of Nd2Fe14B (μ0HA = 7.3 T, μ0Ms = 1.60 T, and Tc = 585 K).8 substituting Nd with these light rare earth element (LRE) leads to a substantial decrease in desirable extrinsic properties and a decrease in their thermal stability.9–12 by microstructure engineering and optimizing the usage of light rare earth elements (LREs), one may overcome the demerits of the intrinsic magnetic properties and may be able to obtain a sufficiently high coercivity with an acceptable thermal stability
By microstructure engineering and optimizing the usage of LREs, one may overcome the demerits of the intrinsic magnetic properties and may be able to obtain a sufficiently high coercivity with an acceptable thermal stability
While detrimental CeFe2 is commonly observed in sintered (Ce,Nd)2Fe14B magnets, it can be suppressed in (Nd1−xCex)2Fe14B hot-deformed magnets even for x = 0.3.16 This allows the improvement of the magnetization and coercivity of (Nd,LRE)2Fe14B hot-deformed magnets
Summary
There are several reports on LRE-substituted (Nd,LRE)2Fe14B sintered magnets,17–19 there are no systematic studies on LRE substitutions and their influence scitation.org/journal/adv on the microstructure and magnetic properties of hot-deformed magnets. This shows that the grain sizes are considerably dependent on the substituted LRE despite the hot-deformation temperatures being the same.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
