Magnetostrictive Fe–Ga Wires for Application in the High-Temperature Waveguide Device

Abstract

(Fe₈₃Ga₁₇)_99.4B_0.6 wires with 0.5 mm diameter were prepared by hot forging, rolling and combining hot and cold drawing. Strong 〈110〉 fiber texture was obtained in the as-drawn and annealed wires by alternating current with short time. Compared with the fracture elongation of about 0.1% in the as-drawn wire, the property increased to 16.1% in the annealed wire. The Young’s modulus of annealed wire was up to 174.3 GPa. In the annealed wires, the maximum twist angle of 206′′/cm and magnetostriction λ_⊥ of −48 ppm was achieved respectively. The obvious voltage signals of the torsional wave could be detected up to 400°C in the annealed wire, which was attributed to the high Curie temperature and highly thermal-stable magnetic properties of the Fe–Ga alloy. The linear downward trend of the velocity of the torsional wave was observed from room temperature to around 250°C. The results indicate that (Fe₈₃Ga₁₇)_99.4B_0.6 wire is suitable for the high-temperature waveguide device.

Fig. 5 Wiedemann twist curves of the annealed (Fe₈₃Ga₁₇)_99.4B_0.6 wire.