Fabrication and magnetic properties of Sm_3(Fe,Ti)_(29)N_x/α-Fe dual-phase nanocomposite permanent magnetic material

查看全文 作　　者：CUI ChunXiang, ZHANG Ying, SUN JiBing & WANG Ru School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China

出　　处：《Science China(Technological Sciences)》索引2007年第50卷第2期,共6页

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 50271024);Natural Science Foundation of Tianjin (Grant Nos. 05YFZJC02200, 05YFGJHZ02201);Natural Science Foundation of Hebei Province (Grant No. E2006000025) 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 for- mation and microstructure of the Sm-Fe alloy is investigated in this paper. The mi- crostructure 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 de- tected 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. 关键词：rapid solidification microstructure Sm3(Fe Ti)29Nx/α-Fe dual phase NANOCOMPOSITE EXCHANGE-COUPLING

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Fabrication and magnetic properties of Sm_3(Fe,Ti)_(29)N_x/α-Fe dual-phase nanocomposite permanent magnetic material

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