| Autor: |
Run Wang, Jingzhi Han, Aizhi Sun, Chengli Tong, Yaofu Xiao |
| Rok vydání: |
2004 |
| Předmět: |
|
| Zdroj: |
Journal of Magnetism and Magnetic Materials. 270:136-141 |
| ISSN: |
0304-8853 |
| DOI: |
10.1016/j.jmmm.2003.08.009 |
| Popis: |
Effects of the disproportionation time on the anisotropy and the microstructures of Nd 13 Fe 80 B 7 alloys were examined. It was found that when the disproportionation time was 5 min, the degree of anisotropy (DOA) of HDDR Nd 13 Fe 80 B 7 anisotropy bonded magnet was 0.58. Moreover, with the prolonging disproportionation time, the DOA decreased monotonically, and the corresponding disproportionation microstructures changed from the early lamella to the final sphere. Comparisons for the lamella disproportionation microstructure and the spherical disproportionation morphology showed that the two disproportionated products were different not only in the components but also in the relationships among the disproportionated products. In the lamella disproportionated products, there are no Fe 2 B phases, and there existed special crystallographic relationship between NdH 2 and α-Fe. It was concluded that the characteristics of the lamella disproportionated mixture contributed to the formation of anisotropy. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect