两种处理工艺下Fe_(78)Si_9B_(13)非晶薄带的磁致伸缩系数

Magnetostriction Coefficient of Amorphous Fe_(78)Si_9B_(13) Under Two Distinctive Treatment

采用低频脉冲磁场和等温退火工艺分别对非晶合金Fe78Si9B13样品进行处理,用自制磁致伸缩测量系统对处理前后样品的磁致伸缩系数进行测量。实验结果表明,两种处理工艺都使样品的饱和磁致伸缩系数λs减小,饱和磁致伸缩系数与退火时间t有关,在300℃温度下等温退火40min,样品的饱和磁致伸缩系数最小,其值为49.52×10-5。饱和磁致伸缩系数λs与低频脉冲磁场强度Hp为非线性关系,饱和磁致伸系数λs对脉冲磁场处理参数有所选择,当Hp为19 900A/m、脉冲频率f为30Hz、t为240s时,饱和磁致伸缩系数最小,其值为2.70×10-5。低频脉冲磁场处理对样品的饱和磁致伸缩系数的影响明显大于等温退火。

Amorphous alloy sample Fe78Si9B13 is disposed by low frequency pulsating magnetic field and isothermic annealing,measuring magnetostriction coefficient by self-made magnetostriction coefficient measuring system.Results showed that both treatment process decreased the saturation magnetostriction coefficient λs of sample,λs is related with annealing time t and it reached minimal value 4.952×10-5 when annealing under 300℃ for 40min.Saturation magnetostriction coefficient λs and low-frequency pulsed magnetic field strength Hp is nonlinear relationship,λs has a choice on the disposing parameters of pulsed magnetic field,λs reach minimal value 2.70×10-5 when Hp equals to 19 900 A/m,pulsing frequency equals to 30Hz and processing time t equals to 240s.The impact of saturation magnetostriction coefficient by low frequency pulsed magnetic field is significantly greater than annealing.