球磨时间对FeCoNiMn_(0.5)Al_(0.2)合金吸波性能的影响机制  

Effect Mechanism of Milling Time on Absorbing Property of FeCoNiMn_(0.5)Al_(0.2) Alloy

作　　者：高敏敏 庞慧芳[1] 段玉平[1] GAO Minmin;PANG Huifang;DU AN Yuping(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024

出　　处：《热加工工艺》2022年第4期37-41,共5页Hot Working Technology

基　　金：国家自然科学基金项目(52071053,U1704253);中国博士后科学基金项目(2020M670748);中国重点科研项目(2017YFB0703103);中央大学基础研究基金项目(DUT20GF111)。

摘　　要：采用高能球磨法制备FeCoNiMn_(0.5)Al_(0.2)高熵合金吸波材料。研究了球磨时间对FeCoNiMn_(0.5)Al_(0.2)合金吸波性能的影响规律及作用机制。结果表明:球磨时间的增长使五种元素的衍射峰逐渐减弱,最终形成FCC与BCC双相混合结构,合金颗粒的长径比逐渐增大。球磨时间增长使非铁磁性元素在铁磁性Fe、Ni元素中的固溶度增加,从而逐渐降低了合金的饱和磁化强度。随球磨时间的增长,球磨引入的杂质和缺陷增加,导致合金的矫顽力逐渐增加,从而减小了各向异性常数和磁致伸缩系数,提升了合金的磁导率与磁损耗作用。随球磨时间的增长,极化效应增强和电导率减小使介电常数呈现先减后增的趋势。其中球磨30h所得的FeCoNiMn_(0.5)Al_(0.2)合金的最佳吸波强度高达-38.181 dB。The high entropy absorbing materials of FeCoNiMn_(0.5)Al_(0.2) alloy were prepared by high energy ball milling method,and the influence regularity and mechanism of milling time on the absorbing property of FeCoNiMn_(0.5)Al_(0.2) alloy were studied.The results show that the diffraction peaks of five elements decrease gradually with the increase of milling time,resulting in the formation of FCC and BCC dual phase structure,and the aspect ratio of alloy particles increases gradually.With the increase of milling time,the solid solubility of non-ferromagnetic elements in ferromagnetic Fe and Ni increases,thus gradually reducing the saturation magnetization of the alloy.With the increase of ball milling time,the impurities and defects introduced by ball milling increase,resulting in the increase of coercivity,which reduces the anisotropy constant and magnetostriction coefficient,and improves the permeability and magnetic loss of the alloy.With the increase of milling time,the polarization effect increases and the conductivity decreases,which makes the dielectric constant decrease first and then increase.The best absorbing strength of FeCoNiMn_(0.5)Al_(0.2) alloy obtained by ball milling for 30 h is-38.181 dB.

关 键 词：高能球磨 FeCoNiMn_(0.5)Al_(0.2) 磁性能 吸波材料 

分 类 号：TG132.2[一般工业技术—材料科学与工程]