Abstract Fe82Ga13.5Al4.5 wires of 0.5 mm 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 1350 A/m axial magnetic field (Ha) and 1400 A/m circumferential magnetic field (Hc) in the AC-annealed wire, which could be attributed to the relatively large magnetostriction of − 46.2 ppm 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.

中文翻译：

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磁致伸缩 Fe 82 Ga 13.5 Al 4.5 导线，在宽温度范围内具有大 Wiedemann 扭曲

摘要 采用热锻、轧制、冷热拉拔相结合的方法，成功制备出直径为0.5 mm的Fe82Ga13.5Al4.5线材。在拉伸和 5A 交流退火（AC 退火）线材中观察到 <110> 织构和具有 692.3 °C 居里温度的 A2 相。在 1350 A/m 的轴向磁场 (Ha) 和 1400 A/m 的圆周磁场 (Hc) 下，在 AC 退火线中获得了 222.6"/cm 的大 Wiedemann 扭曲，这可能归因于相对较大的磁致伸缩- 垂直方向为 46.2 ppm。针对高温下基于维德曼效应的位移传感器应用，研究了扭转波在 Fe82Ga13.5Al4.5 线材中的传播速度。观察到随温度升高呈线性下降趋势，这与热膨胀导致弹性模量下降有关。这项工作表明，Fe82Ga13.5Al4.5 线应该是一种理想的材料，适用于广泛温度范围内的位移传感器应用；尽管如此，为了测量精度，扭转波的速度应设置为与环境温度一致。