The preparation of fine NiFe-base amorphous filaments using the method of glass-coated melt spinning

Abstract

The glass-coated melt spinning of NiFe-base alloys was investigated as a means of producing a fine amorphous filament; the thermal stability of the filament obtained was examined. The effect of rapidly quenching the iron-rich alloy was studied. Continuous amorphous filaments (4 × 10 −6 m in diameter) of Ni xFe 80−xB 20 ( x ⩽ 20), Ni xFe 75−xSi 10B 15 ( x ⩽ 25), Ni xFe 80−xP 20 ( x ⩽ 80), Ni xFe 80−xP 16B 4 ( x ⩽ 60) and Ni xFe 75−xP 15Si 10 ( x ⩽ 75) were obtained from a molten state at 1600 K for winding speeds of more than 3.97 m s −1. The amorphous filament, which was easy to form, exhibited a high crystallization temperature and a large apparent activation energy for crystallization and was relatively stable in the amorphous state.