机械合金化Fe-Si合金的微结构与磁性  

MICROSTRUCTURE AND MAGNETIC PROPERTIES OF Fe Si ALLOYS PREPARED BY MECHANICAL ALLOYING

作　　者：周铁军[1] 王敦辉[1] 章建荣[1] 都有为[1] 王锦辉[2] 陈允鸿[2] 

机构地区：[1]南京大学物理系固体微结构物理国家重点实验室 [2]扬州大学师范学院物理系

出　　处：《物理学报》1997年第11期2250-2257,共8页Acta Physica Sinica

摘　　要：用机械合金化方法制备了不同成分的ＦｅＳｉ合金．其晶粒具有αＦｅ结构，粒径为十几到几十纳米，且晶格存在严重畸变．它们的饱和磁化强度σｓ与Ｓｉ含量近似成线性关系，只是稍小于相应的单晶和多晶ＦｅＳｉ合金，而其矫顽力Ｈｃ和有效各向异性常数Ｋｅｆｆ却远大于相应的单晶和多晶ＦｅＳｉ合金．它们的磁谱除Ｆｅ７５Ｓｉ２５外都是弛豫型的，其磁导率的大小与相应的铁氧体复合材料差不多．在它们的磁化过程中，畴壁位移占主导地位．Some Fe Si alloys have been prepared using the mechanical alloying method. The structure of the obtained Fe Si alloys is the same as that of the bcc α Fe. The final powders mainly consist of some particles with a grain size from a few hundreds of nanometers to several microns,while these particles are composed of some subgrains with a microcrystalline size of about 15—20 nanometers. Their magnetic properties have also been investigated. The values of their specific saturation magnetization ( σ s) are slightly less than those of the corresponding single crystalline and polycrystalline Fe Si alloys, while the values of their coercive force ( H c) are nuch higher than those of corresponding Fe Si alloys in bulk. Their magnetic spectra are all relaxation type except for Fe 75 Si 25 , and the values of their μ′ and μ″ are comparable with those of the ferrite composite materials and, in their magnetizing process, the domain wall displacements are predominant.

关 键 词：机械合金化 铁硅合金 微结构 软磁合金 

分 类 号：TG132.271[一般工业技术—材料科学与工程]