Title :
Structure and magnetic properties of low-neodymium Nd-Fe-B powders by mechanical alloying
Author :
Chen, S.K. ; Huang, T.A. ; Duh, C.S. ; Chin, T.S. ; Yao, J.M.
Author_Institution :
Dept. of Mater. Sci., Feng Chia Univ., Taichung, Taiwan
fDate :
11/1/1995 12:00:00 AM
Abstract :
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
Keywords :
boron alloys; coercive force; crystal microstructure; crystal structure; ferromagnetic materials; iron alloys; magnetic particles; mechanical alloying; neodymium alloys; permanent magnets; stoichiometry; Nd15-xFe77-2xB8+3x powders; Nd15Fe77B8; coercivity; mechanical alloying; microstructure; nanoscale phase; squareness ratio; structure; Alloying; Ball milling; Coercive force; Grain size; Iron; Magnetic materials; Magnetic properties; Neodymium; Powders; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
