Magnetic Properties and Microstructural Modifications of Sm-Co-Hf Alloy Ribbons by B Addition

Microstructure optimization is highly desirable for improving the magnetic properties of permanent magnetic materials. To optimize the microstructure and hence the magnetic properties of Hf-added Sm-Co alloys, SmCo 6.8 Hf 0.2 B x ( x  = 0–0.5) ribbons were fabricated by rapid solidification method a...

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Veröffentlicht in:Journal of superconductivity and novel magnetism 2022-05, Vol.35 (5), p.1329-1335
Hauptverfasser: Zhong, Minglong, Xie, Weicheng, Rehman, Sajjad Ur
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Sprache:eng
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Zusammenfassung:Microstructure optimization is highly desirable for improving the magnetic properties of permanent magnetic materials. To optimize the microstructure and hence the magnetic properties of Hf-added Sm-Co alloys, SmCo 6.8 Hf 0.2 B x ( x  = 0–0.5) ribbons were fabricated by rapid solidification method and high intrinsic coercivity and low-temperature coefficients were obtained in SmCo 6.8 Hf 0.2 B 0.4 alloy ribbons. HfB 2 phase formed in the alloys which acted as grain boundary pinning center for improving the intrinsic coercivity. The grain boundary pinning enhanced greatly as a result of HfB 2 phase formation, the initial magnetic susceptibility decreased, and an enhanced impediment effect is observed during magnetization process. SmCo 6.8 Hf 0.2 B 0.4 alloy ribbons depicted best magnetic properties of intrinsic coercivity, H cj  = 1630 kA/m and remanence, J r  = 0.52 T. The temperature coefficient of coercivity, β  =  − 0.16%/°C was obtained in the temperature range of 27–400 °C, while an intrinsic coercivity of 497 kA/m at 500 °C showed the high-temperature stability of these alloys.
ISSN:1557-1939
1557-1947
DOI:10.1007/s10948-022-06186-9