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Structure and magnetic properties of low-neodymium Nd-Fe-B powders by mechanical alloying

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5 Author(s)
Chen, S.K. ; Dept. of Mater. Sci., Feng Chia Univ., Taichung, Taiwan ; Huang, T.A. ; Duh, C.S. ; Chin, T.S.
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Low-neodymium Nd15-xFe77-2xB8+3x powders were prepared by a mechanical alloying process using commercial Nd-Fe-B and Fe-B ingots as starting materials. Several iron boride phases, including Fe3B, Fe2B, and FeB, were observed to coexist with the Nd2Fe14B phase for the low-Nd compositions. Different process parameters are required to prepare low-Nd powders with optimum coercivity and microstructure. Coercivity of 10.5 to 4.5 kOe was obtained for x=0.0 to 4.5. The squareness ratio is close to an isotropic value of 0.5 for the studied compositions, indicating the interaction between nanoscale Nd2Fe14B and iron boride phases is not strong

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Magnetics, IEEE Transactions on  (Volume:31 ,  Issue: 6 )