Papers by Keyword: Nanocomposite Magnet

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Authors: Vanalysa Ly, Stéphane Gorsse, Kiyonori Suzuki, Christopher R. Hutchinson
Abstract: A physically-based model is proposed for the competitive precipitation of multiple phases (bcc-Fe, Fe3B, Nd2Fe14B, Nd2Fe23B3, NdFe4B4 and Fe2B) from an amorphous Fe-B-Nd matrix. These materials form the basis of a class of nanocomposite hard magnets. The nucleation and growth of the different phases are calculated using computational thermodynamics and kinetics tools with input from a thermodynamic assessment of this system. In some alloy compositions, the phase formation sequence during crystallization shows significant sensitivity to the heating-rate. Model calculations illustrate that this effect cannot be explained by homogeneous nucleation and growth of the phases. The possible role of heterogeneous nucleation is briefly discussed.
1166
Authors: Xie Rong Zeng, Hong Chao Sheng, Ji Zhao Zou, Sheng Hui Xie
Abstract: In Nd9.5Fe84B6.5 melt-spun ribbon, the quenching temperature is found to be effective for the texture development of Nd2Fe14B nanocrystals. For a relatively low quenching temperature of 1250°C a (00l) texture of Nd2Fe14B crystals was found on the free-side surface of the ribbons. At a higher quenching temperature of 1350°C, the microstructure of the free-side surface of the ribbons switches into (320) and (517) texture. It is believed that the transformation of the melt at higher temperature triggers the switch of the texture.
1170
Authors: Jia Jun Guo, Zhong Wei Wang, Jian Zhang, Xu Zhao, Wei Chen
Abstract: The pulse-laser-crystallization (PLC) technique was applied to Nd3.7Pr3.4Dy0.9Fe86B5Nb1 amorphous ribbons. After irradiation with a 248nm KrF pulse excimer laser at a fequency of 15Hz for 1 min, the Nd3.7Pr3.4Dy0.9Fe86B5Nb1 amorphous ribbons crystallized into the homogeneous Nd2Fe14B/α-Fe nanocomposite permanent magnetic materials with an average grain size around 26nm. The obtained coercivity, remanence, and (BH)max values were 6.6 K, 1.23 T, and 18.5 MGOe, respectively.
1693
Authors: Zhao Liang Jiang, X.Y. Chen, Y. Chen, Li Zhang, F.M. Bai, Jie Zhu
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