Abstract
Fe82Ga13.5Al4.5 wires of 0.5mm diameter were successfully prepared by heat forging, rolling, and combining hot and cold drawing. The 〈110〉 texture and A2 phase with 692.3°C Curie temperature were observed in the as-drawn and 5A alternating current annealed (AC-annealed) wires. A large Wiedemann twist of 222.6″/cm was obtained at 1350A/m axial magnetic field (Ha) and 1400A/m circumferential magnetic field (Hc) in the AC-annealed wire, which could be attributed to the relatively large magnetostriction of −46.2ppm in the perpendicular direction. For displacement sensors application based on the Wiedemann effect at high temperatures, the propagation speed of the torsional wave in Fe82Ga13.5Al4.5 wire was studied. A linear downward trend with rising temperature was observed which was related to the decreases in elastic modulus that resulted by thermal expansion. This work shows that Fe82Ga13.5Al4.5 wire should be an ideal material for displacement sensors application over wide temperature range; nevertheless, for the measurement accuracy, the velocity of torsional wave should be set consistent with ambient temperature.
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