Abstract
Fe-based metallic glasses have low magnetic induction and inferior plasticity because of inevitable doping of non-magnetic constituents. The study proposes an innovative composition design strategy considering the nature of elements, binary eutectic, atomic configuration, and mixing entropy in the alloy system. A novel composition of Fe78.9B11.8Si7.6C1Cu0.7 was adopted, adding a total of only 8.3 wt% non-magnetic elements. The critical size of Fe78.9B11.8Si7.6C1Cu0.7 bulk metallic glass was ~1 mm, and an ultra-thick ribbon of ~150 μm was obtained by twin-roll strip casting. Excellent soft magnetic properties with high saturation magnetization (Bs) of 1.68 T and low coercivity (Hc) of 7.1 A/m outperformed current conventional counterpart. Meanwhile, the high breaking strength of 2654 MPa and distinctive plastic strain of 2%, normally less than 0.5% in most Fe-based metallic glasses, was demonstrated in Fe78.9B11.8Si7.6C1Cu0.7 bulk metallic glass. This novel alloy composition and design strategy is expected to facilitate the development of next-generation magnetic materials.
NSTL
Elsevier