The Evolution of Phase Constitution and Magnetic Properties of the Annealed Pr-Fe-B-W Alloy Ribbons

In the present studies the influence of annealing conditions on the phase constitution and magnetic properties of the rapidly solidified Pr9Fe65W8B18 alloy ribbon samples was analyzed.The base alloy was obtained by the arc-melting of the high purity constituent elements under a low pressure of Ar protective atmosphere.The thick ribbon samples (t ≈ 70 µm) were produced by the single-roll melt spinning technique under the low argon pressure at the linear velocity of the copper roll surface of 6 m/s.The X-ray diffraction studies have shown amorphous structure of as-cast ribbons.Heat treatment carried out at various temperatures (from 923 K to 1023 K) caused changes in the magnetic properties of the alloy.The X-ray diffraction studies revealed evolution of the phase constitution of annealed ribbons.The phase analysis has shown presence of hard magnetic Pr2Fe14B and paramagnetic Pr1+xFe4B4 phases.