Effects of oxygen on amorphous formation, magnetic properties and bending ductility in FeBCCu amorphous alloy

Owing to the excellent magnetic properties, Fe-based nanocrystalline alloys are one of promising materials. However, the magnetization-brittleness trade-off during heat treatment is a long-discussed topic. In this work, considering the real mass production environment, the special FeBCCu amorphous ribbons via oxygen regulation are synthesized, and their amorphous formation, magnetic properties and bending ductility are investigated. The large entropy of fusion and Gibbs free energy difference assist the surface crystallization of O-added alloy, which further confirmed that is closely associated with the Cu segregation on the surface of ribbons. Through isothermal stress-relieving annealing (ISRA), the crystalized O-added alloy manifests the good magnetization and bending ductility. Particularly for bending, the well-developed vein-like patterns accompanied with the melted liquid flow and the well-distributed shear bands on crease marks are identified, which effectively mitigates the brittle failure of ribbons. This work provides a feasible strategy to balance the magnetization and brittleness of nanocrystalline alloys via ISRA of surface-crystallized alloys.

Automated summary

In this study, FeBCCu amorphous ribbons with special properties were synthesized via oxygen regulation. The researchers investigated the amorphous formation, magnetic properties, and bending ductility of these ribbons. They found that the surface crystallization of the O-added alloy was closely related to the segregation of Cu on the surface. Through isothermal stress-relieving annealing, the crystalized O-added alloy exhibited good magnetization and bending ductility, effectively mitigating the brittle failure of the ribbons. This work provides a feasible strategy to balance the magnetization and brittleness of nanocrystalline alloys.