非晶态合金丝巨应力电阻抗效应的研究

A Study of Giant Stress Impedance Effect of Amorphous Alloy Wires

研究了具有近零磁致伸缩系数Fe4 .3 5Co68.15Si12 .5B15晶态合金丝在外加压应力作用下显示的巨应力电阻抗 (GSI)效应。比较了Fe4 .3 5Co68.15Si12 .5B15非晶材料及具有大磁致伸缩系数的Fe77.5Si7.5B15非晶材料在弯曲应力作用下显示的应力电阻抗效应的异同。仔细研究了钴基非晶丝两端的电压信号峰峰值与外力、驱动电流Irms及频率f的关系。实验结果表明 ,钴基非晶丝在外加力为 6g ,驱动电流Irms为 10mA ,频率为 2 0 0～ 2 5 0kHz时 ,电压峰峰值变化率可达 40 %。而FeSiB材料在低频及小应力下未发现GSI效应。

The giant stress impedance (GSI) effect shown in nearly zero magnetostrictive Fe 4.35 Co 68.15 Si 12.5 B 15 amorphous wire submitted to an external compressive stress is studied in this paper.The difference of GSI effect for Fe 4.35 Co 68.15 Si 12.5 B 15 and Fe 77.5 Si 7.5 B 15 amorphous wires under bending stresses is compared.A careful investigation of the peak-to-peak output voltage signal for Co-based amorphous wire as a function of applied force F,effective driving current I rms and current frequency f is presented.The experimental results show a relative change ratio of the peak to peak output voltage of about 40% induced by an applied force of 6grams for Co-based wire is obtained at a driving current frequency of 200kHz to 250kHz and an effective alternating current intensity 10mA.No GSI effect is observed in FeSiB wire under relative lower frequency and small applied force.