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Journal of Materials Engineering and Performance

Erschienen in:

21.09.2017

Magnetic Properties of the Nanocrystalline Nd-Ho-Fe-Co-B Alloy at Low Temperatures: The Influence of Time and Annealing

verfasst von: I. S. Tereshina, N. V. Kudrevatykh, L. A. Ivanov, G. A. Politova, E. A. Tereshina, D. Gorbunov, M. Doerr, K. Rogacki

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 10/2017

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Abstract

A study is made of the effects of various factors such as time (7 years), temperature, high magnetic field up to 580 kOe and heat treatment (HT) on the morphological structure and magnetic hysteresis properties of a high-coercive nanocrystalline (Nd_0.55Ho_0.45)_2.7(Fe_0.8Co_0.2)₁₄B_1.2 alloy with a low temperature coefficient of remanence. We find a rather weak time effect on (Nd_0.55Ho_0.45)_2.7(Fe_0.8Co_0.2)₁₄B_1.2. After 7 years, the loss in the maximum magnetic energy product (BH)_max is no more than 5%. Annealing of the sample at 250 °C for 30 min decreases the amount of amorphous phase from 7.2 to 1.7%, while the grains’ size of the 2-14-1 phase increases from 83 to 109 nm. For the HT alloy, a magnetization jump is observed at H ~500 kOe. It can be attributed to the first-order magnetization process or a spin-flip magnetic transition. Rectangularity of the hysteresis loop degrades after annealing. In case of the short-time heat treatment, losses in (BH)_max are ~10%.

Vorheriger Artikel Effects of Destabilization Temperature on the Microstructure and Mechanical Properties of High Chromium Cast Iron

Nächster Artikel Microstructural Characterization of Yttria-Stabilized Zirconia Sintered at Different Temperatures Using 3D EBSD, 2D EBSD and Stereological Calculations

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Titel: Magnetic Properties of the Nanocrystalline Nd-Ho-Fe-Co-B Alloy at Low Temperatures: The Influence of Time and Annealing
verfasst von: I. S. Tereshina
N. V. Kudrevatykh
L. A. Ivanov
G. A. Politova
E. A. Tereshina
D. Gorbunov
M. Doerr
K. Rogacki
Publikationsdatum: 21.09.2017
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 10/2017
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-017-2952-8

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