| Autor: |
Sun Jianchun, Zhou Anruo, Ma Yilong, Dengming Chen, Pengjun Cao |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
Physica B: Condensed Matter. 407:4562-4566 |
| ISSN: |
0921-4526 |
| DOI: |
10.1016/j.physb.2012.08.018 |
| Popis: |
It is difficult to obtain the crystallographic alignment for stoichiometric Nd 2 Fe 14 B alloys by applying the melt-spun and subsequent hot-pressing and hot-deformation techniques. However, the enhanced alignment and magnetic properties of die-upset nano-crystal Nd 2 Fe 14 B magnets have been obtained by Nb addition in the present paper. The magnetic properties studies show that Nb addition leads to the remarkable increase of remanence B r and intrinsic coercivity H ci , 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 Nd 2 Fe 14 B 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 Nd 2 Fe 14 B grains, thus leading to the enhanced alignment and magnetic properties. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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