Abstract
Since the end of 1980s, NdFeB-based hard magnetic alloys have been the materials with the highest available magnetic performance. NdFeB-based magnets are produced either by liquid-phase sintering or by melt spinning. In the present investigation, NdFeB alloys quenched after annealing in the semi-liquid state are used to study the wetting of Nd2Fe14B grain boundaries by a Nd-rich liquid phase. It is shown that a transition from partial wetting to complete wetting occurs with increasing temperature. The results are compared with the data in the literature for NdFeB-based alloys processed by liquid-phase sintering. The relation between wetting properties and magnetic performance of these alloys is also discussed.
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Acknowledgements
The authors thank the Allianz Industrie Forschung (project FE.5150.0028.4067), Max-Planck Institut für Intelligente Systeme (Stuttgart), the Programme of Creation and Development of the National University of Science and Technology ‘MISiS’, the Russian Foundation for Basic Research (grants 10-02-00086, 11-03-00029 and 11-08-90439) and the Ukrainian Fundamental Research State Fund (grant Φ28.2107) for their financial support.
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Straumal, B.B., Kucheev, Y.O., Yatskovskaya, I.L. et al. Grain boundary wetting in the NdFeB-based hard magnetic alloys. J Mater Sci 47, 8352–8359 (2012). https://doi.org/10.1007/s10853-012-6618-5
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DOI: https://doi.org/10.1007/s10853-012-6618-5