High hard magnetic properties and cellular structure of nanocomposite magnet Nd4.5Fe73.8B18.5Cr0.5Co1.5Nb1Cu0.2

Crystalline evolution and large coercivity in Dy-doped (Nd,Dy)2Fe14B/α-Fe nanocomposite magnets

“…• The first peak corresponds to the crystallization of the Fe 3 B and Nd 2 Fe 14 B phases, which is similar to that of other NdFeB-based amorphous ribbons [5,8]; • The second peak, occurring at a slightly higher temperature, is related to the formation of α-Fe, and seems to be a (Nd,Dy) 2 Fe 14 B phase (suggestion); • In sample No. 2, the exothermal peaks shift to lower temperature (see figure 1) because of the doping of Cu with low melting temperature and a high diffusion coefficient as the nucleation is accompanied in crystallization [17].…”

“…Additional merit is in the cost reduction owing to the low consumption of rare-earth elements. Nanocomposite magnets have been studied for compositions like (Pr,Nd) 2 Fe 14 B/Fe 3 B [1,2] and (Pr,Nd) 2 Fe 14 B/α-Fe(Co) [3][4][5][6][7][8]. Some of the recently reported new kind of nanocomposite magnets are self-assembled FePt [9,10], melt-spun nanocomposite magnets FePtB [11,12] and nanocomposite (Nd,Dy)(Fe,Co,Nb,B) 5.5 /α-Fe multilayer magnets [13].…”

“…So far, high-performance nanocomposite magnets have not been obtained with low rare-earth content because high coercivity has not been reached. Nonetheless, the effect of doping elements on the microstructure and magnetic properties of nanocomposite magnets has shown something remarkable [8,[12][13][14][15]. With a small amount of Cr and Co doping, a special microstructure, namely the cellular structure, was observed in α-Fe(Co)/Nd 2 Fe 14 B nanocomposite magnets [8].…”

“…Nonetheless, the effect of doping elements on the microstructure and magnetic properties of nanocomposite magnets has shown something remarkable [8,[12][13][14][15]. With a small amount of Cr and Co doping, a special microstructure, namely the cellular structure, was observed in α-Fe(Co)/Nd 2 Fe 14 B nanocomposite magnets [8]. In fact, the formation of a cellular structure resulted in high shape anisotropy of nano-grains, which contributes to the total magnetic anisotropy of the material.…”

The microstructure, high performance magnetic hardness and magnetic after-effect of an α- FeCo/Pr2Fe14B nanocomposite magnet with low Pr concentration

“…In previous studies [9,10], we have presented our achievements on high performance nanocomposite magnets with low rare-earth content. Moreover, the preparation is the simple rapid-quenched technique, which easily produces the materials on a large scale.…”