Effect of the liquid phase on the formation of orthorhombic boride during the crystallization of Fe82B18 amorphous ribbons

Resumo

Amorphous Fe₈₂B₁₈ ribbons prepared by melt quenching from different temperatures have been studied during step-by-step heating. Depending on the quenching temperature, the crystallization of the ribbons was shown to occur via different mechanisms, namely, with and without the formation of the orthorhombic Fe₃B^orth boride. This is related to different structural states of the melt used for the preparation of the rapidly quenched ribbons. The appearance of the orthorhombic Fe₃B^orth boride is preceded by the crystallization of the amorphous component with the formation of the Fe₃B^tet boride having a distorted body-centered tetragonal lattice.