| Fabrication and magnetic properties of Sm3(Fe,Ti)29Nx/α-Fe dual-phase nanocomposite permanent magnetic material |
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| 作者单位： | CUI ChunXiang（School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China） ;
ZHANG Ying（School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China） ;
SUN JiBing（School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China） ;
WANG Ru（School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China） ; |
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| 基金项目： | Supported by the National Natural Science Foundation of China (Grant No. 50271024), Natural Science Foundation of Tianjin (Grant Nos.05YFZJC02200, 05YFGJHZ02201 ) and Natural Science Foundation of Hebei Province (Grant No. E2006000025) |
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| 摘 要： | Sm3(Fe,Ti)29Nx/α-Fe dual-phase nanometer magnetic material was fabricated through rapid solidification, crystallization and nitridation of Sm-Fe (Ti) alloy. The effect of combination of rapid solidification and Ti alloy addition on the phase formation and microstructure of the Sm-Fe alloy is investigated in this paper. The microstructure of amorphous phase and dual-phase nano-grain crystals before and after crystallization annealing were observed using a high-resolution transmission electron microscope (HREM). The dual-phase nano-grains after annealing were compacted together with a clear interface with the direct exchange-coupling mechanism. Different annealing processes were used to examine the melt-spun alloy. Comparison of the images of SEM showed that annealing at 750℃ for 10 min was most suitable to get homogeneous and nano-grains. No obvious kink was detected in the second quadrant of the hysteresis loop like a single hard magnet, and strong exchange coupling was found between hard magnets and soft magnets.
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| 关 键 词： | rapid solidification microstructure Sm3(Fe Ti)29Nx/α-Fe dual phase nanocomposite exchange-coupling |
| 收稿时间： | 7 February 2006 |
| 修稿时间： | 19 December 2006 |
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