直流磁场对Fe-Cr-Mo合金阻尼性能的影响

利用倒扭摆内耗仪研究了外加直流磁场对Fe-16Cr-2.5Mo合金阻尼性能的影响，采用水基磁流体观察分析了磁畴结构的变化。实验表明，在直流磁场作用下，Fe-16Cr-2.5Mo合金阻尼性能随磁场强度的增大而增大，在0．08mT磁场强度下，合金的阻尼性能达到最大，之后随磁场强度的增大又降低到最低值。施加外磁场后，磁畴显得宽大和均匀，并且发生了明显壁移。研究表明。直流磁场对磁畴结构的影响是导致合金阻尼变化的重要原因。

Effect of Direct-current Magnetic Field on Damping Property of Fe-Cr-Mo Alloy

The damping property of Fe-16Cr-2.5Mo alloy under different external direct-current magnetic field was studied by reversal torsion pendulum technique. The magnetic domain structure variation was analyzed using water-based magnetic fluid. The results show that the damping property of Fe-16Cr-2.5Mo alloy under direct-current magnetic field increases with magnetic field strengh increasing, its maximum value is at 0.08 mT. Over 0.08 naT, it decreases to the lowest value with the further increase of magnetic field strength. Under the condition of external magnetic field, the magnetic domains become wide and homogeneous, moreover it induces movement of the domain walls. The study indicates that the effect of direct-current magnetic field on magnetic domain structure is the most important reason of the damping property variation of this alloy.