LAUSR

Abstract Anisotropic CaCu5-type SmCo4.8Cr0.12C0.08 alloys with a dendritic nanostructure and an out-of-plane texture were fabricated using the melt-spinning method at a speed of 50 m/s. The microstructure changed from randomly orientated equiaxial grains for the ribbon melt-spun at 30 m/s to dendritic ones for that spun at 50 m/s. High-angle annular dark-field scanning transmission electron microscopy and X-ray energy dispersive spectroscopy analysis reveal that the distribution of carbon in SmCo5 grains obtained at higher speeds is highly inhomogeneous and leads to the formation of C-depleted and C-rich dendrite structure with a [ 0001 ] C − r i c h S m C o 5 ∥ [ 0001 ] C − d e p l e t e d S m C o 5 orientation relationship. Moreover, the incorporation of C into the SmCo5 phase helps to increase the Curie temperature to about 845 °C. A high coercivity of 40.3 kOe and a relatively high remanence of 42.0 emu/g were measured in the direction normal to the ribbon plane.