Magnetic properties, phase evolution and microstructures of Pr9.44Fe90.56-xBx (x=7.16 and 4.76) nanocomposite magnets have been investigated. Both as-spun ribbons exhibit two-step demagnetization curves, indicating the feature of partial crystallization. By using differential scanning calorimeter (DSC) measurements, remained amorphous phase of ribbon with x=7.16 shows a higher crystallization temperature. At optimum annealing temperature of 650 ℃ for 10 min, better magnetic properties, Mr=1.01 T, jHc=796 kA/m and (BH)max=136 kJ/m3 were obtained in the sample with x=4.76. Transmission electron microscopy (TEM) observation confirms that the sample with x=4.76 possesses much finer grain size, which causing a better exchange coupling between soft and hard magnetic grains.
YOU Cai-Yi
. B effects on crystallization and magnetic properties of Pr9.44Fe90.56-xBx (x=7.16, 4.76) nanocomposite magnets[J]. Acta Metallurgica Sinica (English Letters), 2010
, 23(5)
: 321
-326
.
DOI: 10.11890/1006-7191-105-321
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