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 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
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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. |
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ISSN: | 1557-1939 1557-1947 |
DOI: | 10.1007/s10948-022-06186-9 |