Open AccessRole of Dy addition in rapid-quenched NdFeB permanent magnets
Author(s) -
Ran Zhang,
Ying Liu,
Gao Sheng-Ji,
Zhi Xie,
TU Ming-jing
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.526
Subject(s) - magnet , materials science , neodymium magnet , microstructure , dysprosium , crystal structure , condensed matter physics , lattice (music) , alloy , crystallography , metallurgy , physics , chemistry , quantum mechanics , acoustics , nuclear physics
Following the previous study on the effect of Nb addition in rapid-quenched (Nd,Dy)11.5Fe82.4-mNbmB6.1 permanent magnets on the magnetic properties, temperature characteristics and microstructure, the role of Dy addition in rapid-quenched Nd11.5-nDynFe81.4Nb1B6.1 (n0,0.5,1,1.5,2) permanent magnets has been investigated. It was found that Hci increases with increasing Dy content and the irreversible loss of magnetic flux decreases. Dy addition results in smaller grains and more homogeneous and regular grain structure. It is considered that Dy addition may enhance exchange coupling pining field and reduce the internal stray magnetic field. As a result, the irreversible loss of magnetic flux decreases notably and the magnetic properties at higher temperature are improved. Dy atoms on entering the main lattice of Nd9.5Dy2Fe81.4Nb1B6.1 alloy cause crystal lattice distorsion and affect the local structure of Fe atoms; however, Dy atoms have little influence of the local structure of Nd atoms.