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Phase Formation and Magnetic Properties of Melt Spun and Annealed Nd-Fe-B Based Alloys with Ga Additions

National University of Science and Technology «MISiS», Leninskiy pr. 4, Moscow 119049, Russia
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Metals 2019, 9(5), 497; https://doi.org/10.3390/met9050497
Received: 20 March 2019 / Revised: 19 April 2019 / Accepted: 26 April 2019 / Published: 28 April 2019
(This article belongs to the Special Issue Advanced Non-Equilibrium Metallic Materials )
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Abstract

The structural transformations and magnetic property changes of the Nd16.2FebalCo9.9Ga0.5B7.5 (SG1, SG2) and Nd15.0FebalGa2.0B7.3 (SG3) nanocomposite alloys obtained by melt spinning in the as-quenched state and after annealing at a temperature range of 560–650 °C for 30 min were studied. The methods used were X-ray diffraction analysis, magnetic property measurements, TEM studies, X-ray fluorescence analysis and Mössbauer spectroscopy. Amorphous phase and crystalline phase Nd2Fe14B (P42/mnm) were observed in the alloy after melt spinning. The content of the amorphous phase ranged from 20% to 50% and depended on the cooling rate. Annealing of the alloys resulted in amorphous phase crystallization into Nd2Fe14B and led to the increased coercivity of the alloys up to 1840 kA/m (23.1 kOe) at 600 °C annealing for 30 min. The alloy with the maximum coercivity had a grain size of the Nd2Fe14B phase ≈50–70 nm with an Nd-rich phase between grains. View Full-Text
Keywords: R-Fe-B; phase composition; hysteresis properties; Nd2Fe14B; Nd-rich phase; amorphous phase R-Fe-B; phase composition; hysteresis properties; Nd2Fe14B; Nd-rich phase; amorphous phase
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Shchetinin, I.; Aggrey, P.; Bordyuzhin, I.; Savchenko, A.; Gorshenkov, M.; Zhelezniy, M.; Menushenkov, V.; Mogil’nikov, P. Phase Formation and Magnetic Properties of Melt Spun and Annealed Nd-Fe-B Based Alloys with Ga Additions. Metals 2019, 9, 497.

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