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本文研究了热处理工艺、合金成份、外磁场以及不同应力振幅对Fe-Cr-Al铁磁性合金阻尼特性(内耗)影响。合金的阻尼性能是用大应力扭摆仪(倒摆,振动频率约20Hz)测得的。研究结果表明,随应力振幅(τ_(max))增加,合金阻尼性能(内耗)明显增高并达到最大值(出现峰值),应力振幅继续增加,合金阻尼性能开始下降或在一定应力范围维持不变,之后缓慢降低。热处理工艺和合金的成份对内耗——应力(Q~(-1)～τ_(amx))曲线特征影响尤为明显。 Fe-Cr-Al合金内耗——应力曲线出现的峰值随外磁场增加而下降,当合金磁化饱和时内耗——应力曲线内耗峰完全消失,即合金由于磁机械滞后效应所引起内耗已不存在,此时合金的阻尼性能最低。
In this paper, the effects of heat treatment process, alloy composition, external magnetic field and different stress amplitudes on the damping characteristics (internal friction) of Fe-Cr-Al ferromagnetic alloys were investigated. The damping performance of the alloy is measured with a large stress swinging instrument (inverted, vibration frequency about 20Hz). The results show that with the increase of stress amplitude (τ max), the damping capacity (internal friction) increases obviously and reaches the maximum value (peak value), the stress amplitude continues to increase, the damping property of the alloy begins to decline or remains unchanged within a certain stress range , Then slow down. The effects of heat treatment process and alloy composition on the characteristics of internal stress - stress (Q ~ (-1) ~ τ amx) curve are particularly obvious. The peak value of internal stress-strain curve of Fe-Cr-Al alloy decreases with the increase of external magnetic field. When the alloy magnetization is saturated, the peak of internal friction in internal stress-stress curve disappears completely, that is, the internal friction caused by the hysteresis effect of the alloy does not exist, At this point the lowest damping alloy.