Glass-Forming Ability and Thermal Stability of Fe-Co–Ni-Zr-Mo-W-B Bulk Amorphous Alloys

Amorphous rods with a diameter of 3 mm were prepared using the copper mold casting method. Differential thermal analysis, X-ray diffraction, and transmission electron microscopy were employed to study the effects of Ni addition on the glass-forming ability and thermal stability of the Fe[[inf]]58[[/inf]]Co[[inf]]10-x[[/inf]]NixZr[[inf]]10[[/inf]]Mo[[inf]]5[[/inf]]W[[inf]]2[[/inf]]B[[inf]]15[[/inf]] (x = 0, 3, 4, 5, 6, mol%) alloy system from a kinetic and structural perspective. The results indicate that the addition of Ni significantly improves the glass-forming ability of Fe[[inf]]58[[/inf]]Co[[inf]]10-x[[/inf]]NixZr[[inf]]10[[/inf]]Mo[[inf]]5[[/inf]]W[[inf]]2[[/inf]]B[[inf]]15[[/inf]] alloys. The Fe[[inf]]58[[/inf]]Co[[inf]]6[[/inf]]Ni[[inf]]4[[/inf]]Zr[[inf]]10[[/inf]]Mo[[inf]]5[[/inf]]W[[inf]]2[[/inf]]B[[inf]]15[[/inf]] alloy achieves the best glass-forming ability with a crystallization temperature (T[[inf]]x[[/inf]]) of 887 K, a glass transition temperature (T[[inf]]g[[/inf]]) of 957 K, a supercooled liquid region (ΔT[[inf]]x[[/inf]]) of 70 K, a reduced glass transition temperature (T[[inf]]rg[[/inf]]) of 0.5902, and a GFA parameter (γ) of 0.4004.