Effect of heat treatment conditions on microstructure and magnetic property of Fe₇₇Co₂Zr₉B₁₀Cu₂ alloy

Abstract

Fe 77 Co 2 Zr 9 B 10 Cu 2 alloy prepared by melt-spinning was annealed at different heat treatment conditions. The thermal property, microstructure and magnetic property of alloys were investigated by differential thermal analysis (DTA), X-ray diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). Fe 77 Co 2 Zr 9 B 10 Cu 2 alloy as-quenched is a mixture of α-Fe(Co) phase, H-phase and amorphous phase. With increasing annealing temperature, the H-phase transforms to α-Fe(Co) phase. Coercivity (Hc) of Fe 77 Co 2 Zr 9 B 10 Cu 2 alloy annealed at 600 • C for 40 min followed by furnace cooling reaches the minimum value, which is attributed to the small and homogeneous α-Fe(Co) grain structure.