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采用改进的JN-1型倒扭摆内耗仪研究了外加交流磁场对Fe-16Cr-2.5Mo合金阻尼性能的影响。试验结果表明,在交流磁场作用下,合金的阻尼性能随磁场强度的增加先增大后减小,但衰减速度超过直流磁场。通过理论推导发现,导致这一变化的原因是交变磁场使畴壁处于振动状态,其振动幅度比直流磁场的大。
The effect of applied AC magnetic field on the damping capacity of Fe-16Cr-2.5Mo alloy was studied with an improved JN-1 inverted internal friction instrument. The experimental results show that under the action of AC magnetic field, the damping property of the alloy first increases and then decreases with the increase of the magnetic field strength, but the damping speed exceeds the DC magnetic field. Through theoretical deduction, it is found that the reason of this change is that the alternating magnetic field makes the domain walls vibrate, and the vibration amplitude is larger than that of the direct current magnetic field.