Magnetic properties and microstructure of melt-spun Sm(Co,Fe,Cu,Zr)8 magnets

Magnetic behavior of Sm-Co-based permanent magnets during order/disorder phase transformations

“…2 is also consistent with that reported in Ref. 22 for Sm-Co-Fe-Cu-Zr alloys but with different annealing times, with similar maximum coercive forces. In our alloys, we do not have Cu or Zr, suggesting that these are not critical for the formation of appropriate structures that have strong pinning characteristics.…”

Effect of wheel speed on the microstructures and magnetic properties of rapidly solidified Sm–Co alloys

“…The same effect was observed in Sm(Co 0.74 Fe 0.1 Zr 0.04 Cu 0.12 ) 8.5 ribbons, melt spun at 5 m/s, due to Zr and Cu substitution for Co [5]. Microstructural varieties were obtained in rapidly quenched Sm(Co,Fe,Cu,Zr) 8 ribbons by adjusting the wheel velocity [6]. The ribbons melt spun at lower velocity (below 40 m/s) exhibited lower intrinsic coercivity ( i H c ∼ 1 kOe) and larger grain sizes in the as-spun state, whereas, the ribbons spun at the velocities above 40 m/s were nanocrystalline and the coercivity was as high as 7 kOe.…”

Phase constitution, evolution and correlation with magnetic performance in nominal SmCo9.8 alloy

“…In recent years, the permanent magnets that keep good magnetic performance at higher temperatures are increasingly demanded [1][2][3]. For example, microwave tubes, gyroscopes and accelerometers, reaction and momentum wheels to control and stabilize satellites, magnetic bearings, sensors and actuators require that the permanent magnets have not only high-energy density but also a wide operating temperature range [4,5].…”