Magnetic hardening of SmFe10V2 by melt-spinning

Intrinsic coercivities as large as H_ci=7.8 kOe were obtained in Sm-Fe-V alloys magnetically hardened by melt-spinning. As-quenched Sm_0.87Fe₁₀V₂ ribbons melt-spun at a substrate velocity of 20 m/s have an intrinsic coercivity H_ci=6.9 kOe and remanence B_r=5.1 kG. The Curie temperature of this material is 585 K. The highest coercivity, H_ci=7.8 kOe, was obtained by overquenching an Sm_0.95Fe₁₀V₂ alloy and subsequently annealing it at 850°C. All peaks except two in the X-ray powder diffraction pattern can be indexed to the ThMn₁₂ structure with lattice constants a=8.506 Å and c=4.779 Å, confirming that the ribbons are principally comprised of the SmFe₁₀V₂ phase. The two extra peaks are due to a cubic (Fe,V) compound. Bulk magnets made by hot pressing overquenched Sm _0.89Fe₁₀V₂ ribbons reached 98% of the theoretical X-ray density of 7.79 g/cm³, with bulk magnetic properties H_ci=5.6 kOe, B_r=5.4 kG, and (BH)_max=4.0 MGOe