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Sintered Nd-Fe-B magnets made from strip cast alloys have been studied extensively owing to their strong permanent magnetic properties. Up to now the studies mainly focus on technology parameters of strip casting, including casting temperature, wheel speed and phase transition temperature and so on. However, microstructure and properties of rapidly solidified strips could be influenced by the composition of alloy. In this work, the effects of added Dy element on microstructures and properties of Nd-Fe-B rapidly solidified strips have been investigated. The strips shad a pronounced texture of the tetragonal T1(2 ∶14 ∶1) phase as shown by the prominent (00l) peaks at wheel surface. The alignment coefficient of the strips was the highest when Dy content ranged from 1 to 2at%. This is the result of the microstructure of strips being optimized through an appropriate amount of Dy addition. At the same time, the volume fraction of isotropic crystal decreased as Dy content increased. It revealed that the oxidation speed decreased with increasing Dy content.
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Keywords:
- strip casting /
- texture /
- microstructure /
- hydrogen decrepitation
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[12] Zhu M G 2004 Ph. D. Dissertation (Beijing:China Iron & Steel Research Institute Group(in Chinese) [朱明刚 2004 博士学位论文(北京:钢铁研究总院)]
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[1] Sagawa M, Fujimura S, Togawa M, Matsuura Y 1984 J. Appl. Phys. 55 2083
[2] Bermardi J, Fidler J, Sagawa M, Hirose Y 1998 J Appl.Phys.83 63966
[3] Zhu M G, Pan W, Li W 2002 Acta Phys. Sin. 51 200 (in Chinese) [朱明刚、潘 伟、李 卫 2002 物理学报 51 200]
[4] Zhu M G, Li W, Dong S Z, Li X M 2001 Acta Phys. Sin. 50 1600 (in Chinese) [朱明刚、李 卫、董生智、李岫梅 2001 物理学报 50 1600]
[5] Pei W I, He C S, Lian F Z, Zhou G Q, Yang H C 2002 J. Magn. Magn. Mater. 239 475
[6] Liu H Q, Wang B, Han G B, Gao R W 2005 J. Magn. Magn. Mater. 285 23
[7] Li X M, Liu T, Guo Z H, Zhu M G, Li W 2008 Acta Phys. Sin. 57 3824 (in Chinese) [李岫梅、刘 涛、郭朝晖、朱明刚、李 卫 2008 物理学报 57 3824]
[8] Ma B M, Bounds C O 1991 J. Appl. Phys. 70 6471
[9] Zhang R, Liu Y, Gao S J, Xie Z, Tu M J 2008 Acta Phys. Sin. 57 526 (in Chinese) [张 然、刘 颖、高升吉、谢 治、涂铭旌 2008 物理学报 57 526]
[10] Zhou S Z, Dong Q F 2004 Super Power Permanent Magnets-Rare Earth Ferrite Permanent Magnetic Material(Second Edition)(metallurgical industry Press) p503 (in Chinses) [周寿增、 董清飞 2004 超强永磁体-稀土铁系永磁材料(第2版)(冶金工业出版社)第503页]
[11] Zhou S Z, Dong Q F 2004 Super Power Permanent Magnets-Rare Earth Ferrite Permanent Magnetic Material(Second Edition)(metallurgical industry Press) p162 (in Chinses) [周寿增、 董清飞 2004 超强永磁体-稀土铁系永磁材料(第2版)(冶金工业出版社)第162页]
[12] Zhu M G 2004 Ph. D. Dissertation (Beijing:China Iron & Steel Research Institute Group(in Chinese) [朱明刚 2004 博士学位论文(北京:钢铁研究总院)]
[13] Chin T S, Huang M P, Tsai D S 1988 J. Appl. Phys. 64 5531
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