Glass Forming Ability, Thermal Stability, and Magnetic Properties of FeCoNiBSi Alloys with Different B Contents

Abstract

The dependence on the glass forming ability, magnetic property, and thermal stability of the (Fe0.39Co0.15Ni0.46)82−xB12+xSi6 (x = 0, 2, 4, and 6) alloys was investigated. The results show that the as-quenched alloy ribbons exhibit a completely amorphous structure with B content in the range of 12∼18 at.%. The initial crystallization onset temperature of the as-quenched ribbon increases with the increase of B content. When the B content is up to 14 at.%, the temperature interval between the two crystallization peaks will sharply reduce, which narrows the effective annealing range that is detrimental to improving the soft magnetic properties. Both of the Ms and Hc of the as-quenched ribbons increase first and then decrease with the increase of B content. Here, the maximum Ms of 0.90 T and low Hc of 10.2 A/m can be obtained at the B content of 14 at.%. Additionally, the (Fe0.39Co0.15Ni0.46)80B14Si6 alloy exhibits the minimum Hc of 5.9 A/m and Ms of 0.934 T at the proposed annealing temperature of 698 K for 10 min in the vacuum condition.