脉冲磁场处理非晶合金产生的纳米晶化相的磁伸性质

摘要

Received 13 December 2011; revised 26 February 2012; accepted 15 March 2012rnThe low frequency pulse magnetic field leads the amorphous thin strip Fe78Si9Bi3 to produce nano crystallization, precipitating α - Fe (Si) nano phase, and then forming α - Fe (Si) nanocrystalline and residual amorphous dual phase nanocrystalline alloy, Mossbauer spectral analysis, with the strength of the pulse magnetic field, crystallization phase volume fraction of dual phrase nano crystalline alloy increases. The magnetostrictive coefficient Λcs CS of nano crystalline phase of α~ Fe ( Si) is negative, with range from- 1.287×10-4 to - 1. 345 × 10-4. Controlling crystallization phase volume ratio can minimize the effective magnetostrictive coefficient Λcs of dual phase nanocrystalline alloy, benefiting the improvement of dual phase nanocrystalline alloy soft magnetic properties.%低频脉冲磁场处理工艺,使非晶薄带Fe78Si9B13产生纳米晶化,析出α-Fe (Si)纳米相,形成α-Fe(Si)纳米晶与剩余非晶的双相纳米合金.穆斯堡尔谱分析,随着脉冲磁场的强度提高,双相纳米晶合金的晶化相体积分数增加.纳米晶化相α-Fe (Si)的磁致伸缩系数λcs为-1.287×10-4～- 1.345×10-4.控制晶化相体积分数,可以使双相纳米晶合金的有效磁致伸缩系数λc.最小,有利于提高双相纳米晶合金的软磁性能.