Effect of Fe Content on the Glass-Forming Ability, Thermal Stability of Supercooled Liquid and Magnetic Properties of Fe_<93-x>Al_5Ga_2(P_<0.55>C_<0.25>B_<0.2>)_x Amorphous Alloys

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The compositional dependence of thermal stability, glass-forming ability and magnetic properties was examined for the Fe_<93-x>Al_5Ga_2(P_<0.55>C_<0.25>B_<0.2>)_x alloys. As the Fe content decreases from 75 to 70 at%, the supercooled liquid region ΔT_x(=Tx-Tg) and the maximum sample thickness for glass formation (t_<max>) increase from 38 to 70 K and 115 to 180μm, respectively. The increase in ΔT_x is due to a more significant increase in crystallization temperature (T_x) which exceeds the degree of the increase in glass transition temperature (T_g). The increases in the thermal stability of the supercooled liquid and the glass-forming ability are presumably because the optimum metalloid content increases to about 23 at% by the dissolution of Al and Ga elements with larger atomic sizes. Furthermore, the increase in the metalloid content to 23 at% was found to cause the improvement of soft magnetic properties through the decrease in coercivity to 4 A/m and the increase in permeability at 1 kHz to 2x10^4, though the saturation magnetization decreases to 120x10^<-6> Wbm/kg. The improvement is interpreted to result from the achievement of the low saturated magnetostriction (σ_s) of 10x10^<-6>. The finding of the new Fe-based amorphous alloys with the wide supercooled liquid region before crystallization, the large glass-forming ability and the good soft magnetic properties combined with the low λ_s is important for the future development of ferromagnetic bulk amorphous alloys.ferromagnetic glassy alloyrapid solidificationwide supercooled liquid regionsoft-magnetic propertysample thickness
東北大学の論文
1997-03-25

Effect of Fe Content on the Glass-Forming Ability, Thermal Stability of Supercooled Liquid and Magnetic Properties of Fe_<93-x>Al_5Ga_2(P_<0.55>C_<0.25>B_<0.2>)_x Amorphous Alloys

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