机械合金化制备铁基纳米晶合金的粉末粒度、结构演变和磁学性能  

Particle size,structural evolution and magnetic properties of iron-based nanocrystalline alloys prepared by mechanical alloying

作　　者：张林 孙阳 陈艺月 谭优 王锋 余鹏 兰颂 ZHANG Lin;SUN Yang;CHEN Yi-yue;TAN You;WANG Feng;YU Peng;LAN Song(School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Key Laboratory of Optoelectronic Functional Materials,School of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,China)

机构地区：[1]重庆交通大学材料科学与工程学院,重庆400074 [2]重庆师范大学物理与电子工程学院光电功能材料重庆市重点实验室,重庆401331

出　　处：《磁性材料及器件》2024年第3期7-14,共8页Journal of Magnetic Materials and Devices

基　　金：重庆市教委科学技术研究项目(KJQN202000738);光电功能材料重庆市重点实验室开放课题基金项目(CKLPFM2022-01);重庆交通大学大学生创业基金项目(CY202135)。

摘　　要：采用单质粉末混合物球磨1~24h制备Fe_(79)Mo_(10)B_(10)Cu_(1)合金粉末,考察合金粉末的粒度、结构和磁学性能。结果表明,延长球磨时间能够细化颗粒粒径(约8μm)和晶粒尺寸(约5 nm),并均匀化粒度分布和合金元素分布。Mo元素置换固溶于α-Fe,降低了合金粉末的饱和磁化强度,且在球磨15h后生成了纳米晶α-(Fe,Mo)单相固溶体,其晶格常数随Mo含量的增加而增大。在合金化前期(˂5h),由于残余应力和磁致伸缩系数的增大,磁弹各向异性成为矫顽力的主导因素,导致矫顽力随晶粒尺寸的减小而反常增大。球磨24h后合金的矫顽力为约2200A/m,微观压应变(约0.52%)和细小B夹杂物(˂1μm)是合金矫顽力较高的主要因素。Elemental powder mixtures were ball-milled for 1 to 24 h to produce Fe_(79)Mo_(10)B_(10)Cu_(1) alloy powders.Particle size,structural and magnetic properties of the mechanically alloyed powders were investigated.Prolonged ball-milling can reduce particle size(about 8μm)and refine grain size(about 5 nm).Particle distribution and elemental distribution become homogenized as well.Substitutional Mo atoms dissolve intoα-Fe lattice,reducing saturation magnetization of the alloy.A single nanocrystalline phaseα-(Fe,Mo)forms after ball milling for 15 h,and its lattice parameter increases with the dissolved Mo content.In early stage of the alloying(<5 h),both residual stress and magnetostrictive coefficient increase.Magnetoelastic anisotropy,therefore,dominates coercivity of the alloy,and contributes to abnormal increase of the coercivity while the grain size becomes smaller.The alloy powder has coercivity of about 2200 A/m even after ball-milled for 24 h.This large coercivity is mainly caused by compressive micro-stain(about 0.52%)and fine boron inclusions(<1μm).

关 键 词：铁基纳米晶合金 机械合金化 球磨时间 粒度 结构 磁学性能 

分 类 号：TM271.2[一般工业技术—材料科学与工程] TG132.271[电气工程—电工理论与新技术]