CRYSTALLIZATION PROGRESS AND MAGNETIC PROPERTY OF Fe–Zr(Nb)–B AMORPHOUS-NANOCRYSTALLINE ALLOY

Abstract

Fe 81 Zr 9 B 10 and Fe 81 Zr 7 Nb 2 B 10 amorphous alloys were prepared by melt-spinning. The microstructures and magnetic properties of the alloys annealed at various temperatures were investigated by X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The crystallization progresses of Fe 81 Zr 9 B 10 and Fe 81 Zr 7 Nb 2 B 10 amorphous alloys are as follows: amorphous → residual amorphous + α- Fe → α- Fe + Fe 3 Zr + ZrFe 2 and amorphous → residual amorphous + α- Fe → α- Fe + Fe 2 Zr , respectively. The grain size (D) of α- Fe in Fe 81 Zr 7 Nb 2 B 10 alloy is smaller than that in Fe 81 Zr 9 B 10 alloy at every annealing stage. The change trend of specific saturation magnetization (Ms) of Fe 81 Zr 7 Nb 2 B 10 alloy with increasing annealing temperature (Ta) is the same as that of Fe 81 Zr 9 B 10 alloy. However, the change trend of coercivity (Hc) of Fe 81 Zr 7 Nb 2 B 10 alloy with increasing annealing temperature is different from that of Fe 81 Zr 9 B 10 alloy, which abruptly deteriorates at 600°C.