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

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

3644

Lastpage

3646

Abstract

Low-neodymium Nd_15-xFe_77-2xB_8+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; Nd_15-xFe_77-2xB_8+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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.489596

Filename

489596