Phase Diagram of Amorphous and Crystallized Fe-B Alloy System

TLDR: In this paper, the structure change with temperature for Fe100-xBx alloys (x=2~33 at.%B) fabricated by a rapid quenching technique has been carried out by measuring magnetization, electrical resistivity and thermal expansion and also by structural analysis by X-ray diffraction.

Abstract: A study of the structure change with temperature for Fe100-xBx alloys (x=2~33 at.%B) fabricated by a rapid quenching technique has been carried out by measuring magnetization, electrical resistivity and thermal expansion and also by structural analysis by X-ray diffraction. The amorphous alloys with 11x13 at.%B transform into α-Fe(B) around 300°C which has a smaller lattice constant than that of α-Fe. Then α-Fe(B) decomposes into two stable α-Fe and Fe2B at about 450°C. For the amorphous alloys with 14x25 at.%B, the amorphous phase transforms into both α-Fe and tetragonal Fe3B compound at about 400°C. With further heating, an orthorhombic Fe3B compound can be observed clearly in addition to these 2 phases for 17x25 at.%B. For temperatures beyond 600~700°C, they transform to the equilibrium phases of α-Fe and Fe2B compound.