Glass-Forming Ability and Magnetic Properties of $({rm Fe}_{0.80}{rm Co}_{0.20})_{96hbox{-}{x}}{rm B}_{{x}}{rm Si}_{{1}}{rm Nb}_{{3hbox{-}{y}}}{rm Y}_{{{rm y}}}~({{x}}={15}, 17)$ Amorphous Alloys

摘要

The glass-forming ability (GFA) and the magnetic properties of the $({rm Fe}_{0.80}{rm Co}_{0.20})_{96hbox{-}x}{rm B}_{x}{rm Si}_{1}{rm Nb}_{3hbox{-}y}{rm Y}_{y}~(x=15,17)$ amorphous alloys have been studied. It was confirmed that GFA is enhanced by replacing Nb with Y. Yttrium gives a complex effect on the magnetization. When Y content is increased, the saturation mass magnetization $(sigma_{s})$ decreases first. However, the $sigma_{s}$ then increases and exhibits a maximum ${sim}{2}$ at% Y. The value of $sigma_{s}$ of the alloy with $x=17$ and $y=2$ in an as-quenched state is $211times 10^{-6}~{rm Wb}~{rm m}/{rm kg}$ , which is slightly larger than that of the Y-free alloy with the same B content. The values of the coercivity of these alloys are less than 10 A/m in an as-quenched state. The coercivity shows a tendency to decrease with increasing Y content, which means the increase of GFA. These results indicate that the partial replacement of Nb by Y in the Fe-Co-B-Si-Nb alloys is useful to the simultaneous achievement of high GFA, high $sigma_{s}$ , and good soft magnetic properties.