Abstract
Magnetic properties and microstructures of Pr- Fe-B (Ga) melt-spurn ribbons prepared by single or twin-roller were studied. The texture with the c-axis normal to the surface was observed in slowly quenched ribbons, and shows a strong dependence on composition. Ga addition is effective in increasing the coercivity and the c-axis alignment of the ribbons. Magnetic measurement of the ground powders of the ribbons quenched by twin-roller shows that the powders solidified in a paraffin bath with applying a magnetic field of 12 kOe show high coercivity of iHc= 13.8 k0e and higher remanence than those withowt applying a magnetic field. Microstructural observations of cast alloys suggest that the strong c-axis alignment arose from the rapid-quenching.
