Abstract
Effect of Co substitution and annealing treatment on the formation, magnetic properties and microstructure of (NdDyTb) 12.3(FeZrNbCu) 81.7- x Co x B 6 ( x=0–15) ribbons prepared by rapid quenching and subsequent annealing was systematically investigated by means of differential scanning calorimeter (DSC), X-ray diffraction (XRD), high resolution scanning electron microscopy (HRSEM) and vibrating sample magnetometer (VSM). Phase analysis revealed single-phase material. The remanence polarization J r and maximum energy product ( BH) max increased with increasing x from 0 to 12 and then decreased for x=15. The intrinsic coercivity H ci of (NdDyTb) 12.3 (FeZrNbCu) 81.7– x Co x B 6 ribbons optimally processed decreased from 1308.7 kA/m for x=0 to 817.4 kA/m for x=15. Optimum magnetic properties with J r=1.041 T, H ci=944.9 kA/m and ( BH) max=155.1 kJ/m 3 were achieved by annealing melt-spun ribbon ( x=12) at 675 °C for 10 min. There was no significant influence of Co substitution on microstructure.
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