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Crystallization kinetics of amorphous Nd3.6Pr5.4Fe83Co3B5 and preparation of α-Fe/Nd2Fe14B nanocomposite magnets by controlled melt-solidification technique

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Abstract

The crystallization kinetics of amorphous Nd3.6Pr5.4Fe83Co3B5 and the preparation of α-Fe/Nd2Fe14 B nanocomposite magnets by controlled melt-solidification of Nd3.6Pr5.4Fe83Co3B5 was investigated by employing DTA, XRD, and TEM. The results show that a metastable intermediate phase Nd8Fe27B24 prior to α-Fe and Nd2Fe14B phases is crystallized as the amorphous Nd3.6Pr5.4Fe83Co3B5 is heated to 1 223 K. The crystallization activation energy of α-Fe and Nd8Fe27B24 phases is larger at the beginning stage of crystallization, and then it decreases with crystallized fraction x for the former and has little change when x is below 70% for the latter, which essentially results in an α-Fe/Nd2Fe14B microstructure with a relatively coarse grain size about 20–60 nm and a non-uniform distribution of grain size in the annealed alloy. The α-Fe/Nd2Fe14B nanocomposite magnets with a small average grain size about 14 nm and a quite uniform grain size distribution were prepared by controlled melt-solidification of Nd3.6Pr5.4Fe83Co3B5 at a wheel speed of 20 m · s−1 during melt-spinning. The magnets show a high maximum energy product of (BH)max=194 kJ · m−3, which is nearly twice of that of the nanocomposite magnets made by annealing the amorphous Nd3.6Pr5.4Fe83Co3B5 precursor alloy.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Hunan University, 410082, Changsha, China

    Yang Li Doctoral candidate

  2. Office of Natural Science Foundation of Hebei Province, 050000, Shijiazhuang, China

    Shang Yong

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  1. Yang Li Doctoral candidate
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  2. Shang Yong
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Correspondence to Yang Li Doctoral candidate.

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Yang, L., Shang, Y. Crystallization kinetics of amorphous Nd3.6Pr5.4Fe83Co3B5 and preparation of α-Fe/Nd2Fe14B nanocomposite magnets by controlled melt-solidification technique. J Cent. South Univ. Technol. 10, 280–286 (2003). https://doi.org/10.1007/s11771-003-0024-8

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  • DOI: https://doi.org/10.1007/s11771-003-0024-8

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