Phase formation and magnetic properties of melt spun and annealed Nd-Fe-B based alloys with Ga additions

Авторы: Shchetinin I., Aggrey P., Bordyuzhin I., Savchenko A., Gorshenkov M., Zhelezniy M., Menushenkov V., Mogil’Nikov P.
Журнал: Metals
Том: 9
Номер: 5
Год издания: 2019
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
DOI: 10.3390/met9050497
Аннотация: 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. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.
Добавил в систему: Железный Марк Владимирович

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