Abstract
Melt-spun Pr 9Fe 82Zr 2Cu 0.5B 6.5 ribbons are prepared by the melt-spinning technique. The ribbons are mainly composed of Pr 2Fe 14B and α-Fe phases. Amorphous phase appears as the wheel speed exceeds 7.5 m/s. The combined additions of Zr, Cu and B refine the microstructure, resulting in an increase of coercivity. For the ribbons prepared at the optimum wheel speed, the coercivity, remanence and maximum energy product are 9.2 kOe, 9.2 kG s and 16.8 MG Oe, respectively. The optimum wheel speed decreases from 20 m/s for the pure ternary Pr 2Fe 14B/α−Fe nanocomposite to 12.5 m/s. By an investigation of Henkel plots of the ribbons, it is found that strong intergrain exchange coupling leads to the improvement of coercivity and remanence. The coercivity mechanism of the ribbons prepared at v=12.5 m/s is mainly controlled by inhomogeneous pinning of domain walls.
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