Thermal Stabilities of the Structure and Magnetic Properties in Supercooled Liquid Region for Fe-Al-Ga-P-C-B-Si Glassy Alloys

Abstract

Thermal stabilities of structure and soft magnetic properties were investigated for melt-spun Fe-Al-Ga-P-C-B-Si glassy alloy ribbon with various sample thicknesses. No change in structure and soft magnetic properties for Fe₇₀Al₆Ga₁P_11.4C₄B₄Si_3.6 can be observed by holding at the starting temperature of endothermic reaction for glass transition (T_g^onset) for 1.6 ks, which is much longer than those of conventional Fe-based amorphous alloys without supercooled liquid region. The thermal stability of Fe-based glassy alloy increases with increase of the width of supercooled liquid region. It does not, however, depend upon sample thickness. We can, therefore, hope that bulky Fe-Al-Ga-P-C-B-Si glassy alloy has a high workability without inferior of soft magnetic properties, because deformation and working processes are much easier in the supercooled liquid region owing to its low viscosity and ideal Newtonian flow.