Abstract
Nanocomposite (Nd,Pr) 2Fe 14B/α-Fe magnets were prepared by crystallizing the amorphous melt-spun ribbons. The effects of Nb and Zr additions on the crystallization behavior, microstructure, and magnetic properties of (Nd 0.4Pr 0.6) 8.5Fe 85.5− x − y Nb x Zr y B 6 ( x = 0 , 0.5 , 1 ; y = 0 , 0.5 , 1 ) alloys were studied. The microstructure and phase analysis shows that for (Nb,Zr)-free ribbons, α-Fe first precipitates, followed by the crystallization from amorphous to metastable phase before final transformation to the 2 : 14 : 1 phase and α-Fe. However, the combined Nb and Zr additions can increase the precipitating temperature of α-Fe, restrain the formation and growth of α-Fe, avoid the formation of metastable phase, refine and uniform the grain size, and thus greatly enhance intergrain exchange coupling between the hard and soft magnetic phases (verified by δM– H plot). After optimal thermal treatment, the coercivity and maximum energy product increase from 411 kA/m, 107 kJ/m 3 for (Nd 0.4Pr 0.6) 8.5Fe 85.5B 6 sample to 534 kA/m, 144 kJ/m 3 for (Nd 0.4Pr 0.6) 8.5Fe 84.5Zr 0.5 Nb 0.5B 6 sample, respectively.
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