弯曲应变下Co66Fe4Cr2Si12B16非晶态合金带应力阻抗效应

对具有负磁致伸缩系数的Co66Fe4Cr2Si12B16非晶合金带在制备态下及经脉冲电流退火下的应力阻抗效应进行了研究.结果表明:长为50 mm的非晶带,在仅5 mm挠度的弯曲应变作用下材料可显示显著的应力阻抗效应,输出电压幅值变化率大于40%.非晶材料经电流密度为35 A/mm2,频率为2 Hz,持续时间为30 s的脉冲电流退火处理后,可改善应力阻抗效应灵敏度.该非晶材料受张应力作用时阻抗减小,受压应力作用时阻抗增大,弯曲应变下的应力阻抗效应可用于制作具有高应变因子的力传感器及新型智能材料.

Stress Impedance Effect in Co66Fe4Cr2Si12B16 Amorphous Ribbon under Bending Strain

The stress impedance effect is studied for the Co66Fe4Cr2Si12B16 amorphous ribbons under bending strain. One of the amorphous ribbons is in as-cast state and the other is treated by pulse current, and the both amorphous ribbons are of the negative magnetostriction. The experimental result shows that the amplitude ratio of the output voltage from the two ends is larger than 40% for the pulse current annealed amorphous ribbon of 50 mm in length only under a bending strain of 5 mm deflection. The stress impeda...