Abstract
Crystalline structure, thermal stability and magnetic properties of Hf2(FexCo1−x)11B (x = 0.2, 0.4) alloys were investigated and compared to those of well-known Hf2Co11B parent compound. Fully amorphous ribbons were synthesized by rapid quenching. The increasing amount of Fe resulted in higher thermal stability of the amorphous ribbons, as the crystallization temperature increased from 622 to 632 °C for x = 0.2 and 0.4, respectively. Hf2Co11 (in rhombohedral and orthorhombic structure) and HfCo2 precipitate in Hf2(Fe0.2Co0.8)11B and Hf2(Fe0.4Co0.6)11B isothermally annealed at T = 610 °C. Fe-containing phases, as (FeCo)3B and α-Fe, were also formed. Moreover, annealing at T = 665 °C resulted in the formation of HfCo3B2 phase regardless of composition. The highest value of magnetization saturation was obtained for Hf2(Fe0.4Co0.6)11B melt-spun sample, while the coercive field and anisotropy constant were maximized for Hf2(Fe0.2Co0.8)11B after heat treatment at T = 610 °C.
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