Abstract
The phase evolution, microstructure and magnetic properties of Nd 9– x Y x Fe 72Ti 2Zr 2B 15 ( x=0, 0.5, 1, 2) nanocomposite ribbons were investigated. It was found that substitution of Y enhanced glass forming ability of the over-quenched ribbons and stabilized the amorphous phase during post annealing treatment. Appropriate content of Y substitution effectively refined the microstructure and enhanced the remanence of the annealed samples. The residual amorphous intergranular phase in the annealed sample improved the squareness of loops, resulting in enhanced maximum energy product. The optimum annealing treatment significantly improved magnetic properties of the Y substituted ribbons. Best magnetic properties, J r=0.78 T, H ci=923.4 kA/m, ( BH) max=98.5 kJ/m 3 were obtained from Nd 8YFe 72Ti 2Zr 2B 15 ribbon spun at V s = 4 m/s, and annealed at 700 °C for 10 min.
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