机械合金化制备Fe_(94-x)Zr_2Nb_4B_x(x=10,15,20)纳米合金粉及磁性研究  

Magnetic Properties of Fe_(94-x)Zr_2Nb_4B_x(x=10, 15, 20) Nanocrystalline Alloy Powders Prepared by Mechanical Alloying

作　　者：唐翠勇[1] 肖志瑜[1] 马春宇[1] 林小为[1] 张文[1] 

机构地区：[1]华南理工大学,广东广州510640

出　　处：《稀有金属材料与工程》2011年第S2期300-304,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(50874051);教育部新世纪优秀人才资助项目(NCET-05-0739)

摘　　要：采用机械合金化方法制备Fe94-xZr2Nb4Bx(x=10,15,20)纳米晶合金粉末,研究不同含量类金属元素B和不同球磨时间对合金组织结构和磁性能的影响。通过X射线衍射(XRD)仪和扫描电镜(SEM)分析球磨过程中粉末的相变和形貌,用物理性能测量系统(PPMS)研究粉末的磁性能。结果表明,球磨过程中,粉末不断细化,球磨130h得到具有bcc结构α-Fe相纳米晶过饱和固溶体合金粉末。随着元素B含量的添加,合金粉末的饱和磁化强度(Ms)由161.70(A·m2)/kg(x=10)下降至152.74(A·m2)/kg(x=20)。对于Fe84Zr2Nb4B10合金粉末,球磨时间对磁性能影响明显,其饱和磁化强度随着球磨时间的延长而增加,矫顽力(Hc)则先增大再减小。可能是晶粒细化,晶粒间磁交换耦合作用增强所致,可运用纳米尺度效应和Herzer模型合理解析。粉末在650K温度下退火1h,矫顽力降低为934.50A/m,饱和磁化强度为163.75(A·m2)/kg,得到具有潜在开发价值的软磁粉末材料。Nanocrystalline Fe94-xZr2Nb4Bx(x=10,15,20) alloy powder was prepared by mechanical alloying (MA). The effects of the difference content of metalloid element B and milling time on microstructure evolution, phase transformation and magnetic properties were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and physical property measure system (PPMS). Results show that during mechanical alloying, the ball-milled powder was alloyed and refined. The final product exhibited a nanostructured α-Fe supersaturated solid solution with bcc structure. By adding B to substitute for Fe, the saturation magnetization (Ms) decreased from 161.70 (A·m2)/kg (x=10) to 152.74 (A·m2)/kg (x=20). For Fe84Zr2Nb4B10 alloy powder. There was an evident change in magnetic properties corresponding to the evolution of milling time. The saturation magnetization increased with increasing milling time, but the coercivity (H c ) increased firstly and then decreased. The variation of these parameters can be explained by the Nano-scale effect and the Herzer model. The powder annealed in vacuum at 650 K for 1 h, the coercivity decreased to 934.50 A/m and the saturation magnetization increased to 163.75 (A·m2)/kg, which promises the potential application as soft magnetic powder materials.

关 键 词：机械合金化 纳米晶合金 软磁材料 微结构 

分 类 号：TB383.1[一般工业技术—材料科学与工程]