Journal
PHYSICA B-CONDENSED MATTER
Volume 407, Issue 23, Pages 4562-4566Publisher
ELSEVIER
DOI: 10.1016/j.physb.2012.08.018
Keywords
Nanocrystalline; Nd2Fe14B; Anisotropic; Nb addition; Microstructure
Categories
Funding
- Key Project of Chongqing Natural Science Foundation [CSTC2012JJB0090]
- Research Foundation of Chongqing Education Committee [KJ121415]
- Chongqing University of Science and Technology [CK2010B29]
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It is difficult to obtain the crystallographic alignment for stoichiometric Nd2Fe14B alloys by applying the melt-spun and subsequent hot-pressing and hot-deformation techniques. However, the enhancedalignment and magneticproperties of die-upsetnano-crystal Nd2Fe14B magnets have been obtained by Nb addition in the present paper. The magneticproperties studies show that Nb addition leads to the remarkable increase of remanence Br and intrinsic coercivity Hci, which is due to the improvement of c-axis texture and refinement of microstructure. Microstructure studies using transmission electron microscopy (TEM) and X-ray diffraction (XRD) reveal that Nb atoms are enriched at grain boundary and the NbFeB phase is observed with increasing Nb content. Since some Fe atoms in the Nd2Fe14B phase participate in the formation of NbFeB phase, the excessive Nd atoms may be enriched at grain boundary, which may improve the physical property of grain boundary and provide a mass transport pass for preferential growth of oriented Nd2Fe14B grains, thus leading to the enhanced alignment and magnetic properties. (C) 2012 Elsevier B.V. All rights reserved.
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