Microstructure and Magnetic Properties of SmCo-Based Nanocrystalline Magnets Doped With Cr3C2.

The effect of wheel speed as well as an additive Cr3C2 on the structure, crystalline texture, and magnetic properties of SmCo-based nanocrystalline magnets has been investigated. A low wheel speed of melt spinning of SmCo6.8(Cr3C2)0.2 promotes the formation of the Cr- and C-contained SmCo7 main phase with a \langle 0001\rangle out-of-plane texture, an average grain size of 38–60 nm, and a smooth {M} – {H} loop with sound rectangularity. On the other hand, for SmCo4.8(Cr3C2)0.2 alloys, H \mathrm{ci} significantly enhances from 28.1 to 36.6 kOe and {M} r increases from 23.2 to 28.0 emu/g with an increasing wheel speed from 30 to 50 m/s. A high wheel speed of 50 m/s in SmCo4.8(Cr3C2)0.2 contributes to the formation of dendrite SmCo5 grains with the short axis of about 20–50 nm and the long axis ranging from 100 nanometers to about 1 micrometer. An obviously preferential orientation along the $\langle 0001\rangle $ direction in SmCo5 grains is observed, which could be confirmed by the transmission electron microscope analysis and anisotropic magnetic behavior. The addition of Cr3C2 gives a hint toward the direction of texturing in SmCo-based magnets melt spun at high wheel speeds. [ABSTRACT FROM AUTHOR]