Effects of Annealing on the Structure and Magnetic Properties of Fe₈₀B₂₀ Magnetostrictive Fibers

Abstract

In this study, Fe80B20 amorphous fibers with the diameter of 60 μm were prepared by the single roller melt-spinning method and annealed at 200°C, 300°C, 400°C, and 500°C, respectively. XRD results indicate that the fiber structure remains amorphous when the annealing temperature is below 400°C. α-Fe phase and Fe3B phase appear when the annealing temperature rises to 500°C, which is above the crystallization temperature of 449°C. The recrystallization activation energy is calculated to be 221 kJ/mol. The coercivity increases with increasing annealing temperature, which attributes to the increase of total anisotropy. All the as-spun and annealed fibers exhibit good resonance behavior for magnetostrictive sensors.

Prospects to Use Amorphous Fe–Ni–Si–B Ribbons in Contactor Cores

“…In [10], it was determined that Ni in the composition has a strong in- fluence on the magnetic properties and is the main factor to get soft magnetic properties, by creating an anisotropy field and reducing the coercive force. The authors of [11] found that processing of amorphous Fe 80 B 20 alloy at 449 ∘ C worsens the soft magnetic properties and leads to an increase in the coercive force. As can be seen from numerous studies, the choice of a chemical composition and a processing mode is the main factor to obtain various required magnetic parameters depending on the purpose.…”