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1.R Coehoorn, D B De Mooij, and C de Waard, “Meltspun permanent magnet materials containing Fe3B as the main phase,” Journal of Magnetism and Magnetic Materials 80(1), 101-104 (1989).
2.A Manaf, R A Buckley, and H A Davies, “New nanocrystalline high-remanence Nd-Fe-B alloys by rapid solidification,” Journal of Magnetism and Magnetic Materials 128(3), 302-306 (1993).
3.G C Hadjipanayis, L Withanawasam, and R F Krause, “Nanocomposite R2Fe14B/α-Fe permanent magnets,” Magnetics, IEEE Transactions on 31(6), 3596-3601 (1995).
4.R Fischer, T Schrefl, H Kronmüller et al., “Phase distribution and computed magnetic properties of high-remanent composite magnets,” Journal of magnetism and magnetic materials 150(3), 329-344 (1995).
5.R Fischer, T Schrefl, H Kronmüller et al., “Grain-size dependence of remanence and coercive field of isotropic nanocrystalline composite permanent magnets,” Journal of magnetism and magnetic materials 153(1), 35-49 (1996).
6.L Withanawasam, A S Murphy, G C Hadjipanayis et al., “Nanocomposite R2Fe14B/Fe exchange coupled magnets,” Journal of Applied Physics 76(10), 7065-7067 (1994).
7.Z Wang, S Zhou, M Zhang et al., “Effects of as-quenched structures on the phase transformations and magnetic properties of melt-spun Pr7Fe88B5 ribbons,” Journal of Applied Physics 86(12), 7010-7016 (1999).
8.L X Liao and Z Altounian, “Formation, crystallization, and magnetic properties of Nd-Fe-B glasses,” Journal of applied physics 66(2), 768-771 (1989).
9.M Yamasaki, M Hamano, H Mizuguchi et al., “Microstructure of hard magnetic bccFe/NdFeB nanocomposite alloys,” Scripta materialia 44(8), 1375-1378 (2001).
10.Z Chen, Y Zhang, G C Hadjipanayis et al., “Effect of wheel speed and subsequent annealing on the microstructure and magnetic properties of nanocomposite Pr2Fe14B/α-Fe magnets,” Journal of magnetism and magnetic materials 206(1), 8-16 (1999).
11.Y C Liu, H W Li, K S Li et al., “Magnetic properties optimization of nanocomposite Nd9Fe85B6 magnets by controlling microstructure of as-quenched ribbons,” Rare Metals 33(3), 299-303 (2014).
12.J Gao, T Volkmann, and D M Herlach, “A metastable phase crystallized from undercooled NdFeCoZrGaB alloy droplets,” Journal of alloys and compounds 308(1), 296-300 (2000).
13.K Men, K Li, Y Luo et al., “The crystallization behavior of as-quenched Nd9Fe85Nb0.5B5.5 alloys,” Journal of Alloys and Compounds 635, 61-65 (2015).
14.T Harada and T Kuji, “Crystallization of amorphous melt-spun Nd15Fe77Bx (x=6-14) alloys,” Journal of materials research 9(02), 372-376 (1994).
15.D G Minić, V A Blagojević, L E Mihajlović et al., “Kinetics and mechanism of structural transformations of Fe75Ni2Si8B13C2 amorphous alloy induced by thermal treatment,” Thermochimica Acta 519(1), 83-89 (2011).
16.K Lu, “Nanocrystalline metals crystallized from amorphous solids: nanocrystallization, structure, and properties,” Materials Science and Engineering: R: Reports 16(4), 161-221 (1996).
17.J Gao, T Volkmann, S Roth et al., “Phase formation in undercooled NdFeB alloy droplets,” Journal of magnetism and magnetic materials 234(2), 313-319 (2001).
18.N Sano, T Tomida, S Hirosawa et al., “Crystallization process of a rapidly quenched Fe–B–Nd nanocomposite magnet,” J. Materials Science & Engineering A 250(1), 146-151 (1998).

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A series of alloys composed of NdFeNbB were prepared through rapid quenching by different wheel speeds. Nanocomposite was usually obtained by subjecting the as-quenched alloys to a crystallization annealing. The crystallization behavior was investigated by differential scanning calorimetry(DSC) as the primary method. The results showed that the DSC curve of sample prepared at 15 m/s had only one exothermic peak at about 690 °C. When the wheel speed increased to 18-27 m/s, one more peak at 590 °C appeared. Moreover, the intensity of this new peak enhances while the original one at 690 °C declined as the speed increases within this range. When the speed further grew up to 30, 35, or 40 m/s , only the peak at 590 °C remained while the other disappeared. This could be ascribed to the different initial phase structures of the alloys, which were found to vary with the wheel speeds. As can be seen, with increasing the wheel speed, the contents of amorphous and metastable phase increased while NdFeB phase decreased. This change resulted in a huge effect on the crystallization behavior. We could deduce the relative content of each phase from the integral areas of peaks in DSC curves in different samples and figure out the phase transition in the crystallization. The results showed that the crystallization of samples prepared by relatively high speeds, which are almost amorphous initially, manifest as only one step, while those prepared by relatively low speeds showed two. Subsequently, we analyzed the crystallization process and interpreted it from the theory of energy barrier.


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