Microalloying effect of Cu and Nb on the microstructure and magnetic properties of Fe{sub 3}B/Nd{sub 2}Fe{sub 14}B nanocomposite permanent magnets
This paper reports the microalloying effect of Cu and Nb on the microstructure and magnetic properties of a Fe{sub 3}B/Nd{sub 2}Fe{sub 14}B nanocomposite permanent magnet. Optimum magnetic properties with B{sub r} = 1.25 T, H{sub cJ} = 273 kA/m and (BH){sub max} = 125 kJ/m{sup 3} were obtained by annealing a melt-spun Nd{sub 4.5}Fe{sub 75.8}B{sub 18.5}Cu{sub 0.2}Nb{sub 1} amorphous ribbon at 660 C for 6 min. Compared with a ternary Nd{sub 4.5}Fe{sub 77}B{sub 18.5} alloy, the grain size is much finer in the optimum microstructure of the Cu and Nb containing alloys, and the temperature range of the heat-treatment for obtaining optimum hard magnetic properties was significantly extended. The soft magnetic Fe{sub 23}B{sub 6} phase coexists with Fe{sub 3}B and Nd{sub 2}Fe{sub 14}B phases in the optimum microstructure. Three-dimensional atom probe (3DAP) analysis results have revealed that the finer microstructure is due to the formation of a high number density of Cu clusters, which promote the nucleation of the Fe{sub 3}B phase. The Nb atoms appear to induce the formation of the Fe{sub 23}B{sub 6} phase and stabilize it by partitioning into this phase.
- Research Organization:
- National Research Inst. for Metals, Tsukuba (JP)
- OSTI ID:
- 20000749
- Journal Information:
- IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers), Vol. 35, Issue 5Pt2; Conference: 1999 international magnetics conference (Intermag '99), Kyongju (KR), 05/18/1999--05/21/1999; Other Information: PBD: Sep 1999; ISSN 0018-9464
- Country of Publication:
- United States
- Language:
- English
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