Ce掺杂对Fe_(81)Ga_(15.5)A1_(3.5)合金微观结构和磁性能的影响  

Effect of Cedoping on microstructure and magnetostriction properties of Fe_(81)Ga_(15.5)A1_(3.5) alloy

作　　者：杜金超 郝宏波[2] 李华 焦佩英 龚沛[1] DU Jinchao;HAO Hongbo;LI Hua;JIAO Peiying;Gong Pei(School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;State Key Laboratory ofBaiyunebo Rare Earth Resources Research and Comprehensive Utilization,Baotou Rare Earth Research Institute,Baotou 014010,China)

机构地区：[1]内蒙古工业大学材料科学与工程学院,呼和浩特010051 [2]包头稀土研究院白云鄂博稀土资源研究与综合利用国家重点实验室,内蒙古包头014010

出　　处：《功能材料》2023年第12期12177-12182,共6页Journal of Functional Materials

基　　金：内蒙古自治区科技计划项目(2020GG0284)。

摘　　要：以Fe_(81)Ga_(15.5)Al_(3.5)合金为基体向其中掺杂Ce元素,研究(Fe_(81)Ga_(15.5)Al_(3.5))_(100-x)Ce_(x)(x=0,0.2,0.4,0.6,0.8,1.0)合金微观结构和磁性能的变化。结果显示:Fe_(81)Ga_(15.5)A1_(3.5)合金的晶粒形状为柱状晶,加入Ce元素后,晶粒形状变为树枝晶。少量Ce元素加入时,(Fe_(81)Ga_(15.5)Al_(3.5))_(100-x)Ce_(x)合金的相结构仍以A2相为主;当x>0.8%时,合金的相结构由A2相和CeCa_(2)相组成。Ce元素的加入可以改变合金[100]晶向的取向性;合金的晶格常数随着Ce含量的增加而逐渐减小。在扫描电镜下,可以观察到Fe_(81)Ga_(15.5)Al_(3.5)合金基体内有深色的点状析出物呈无序分布,随着Ce元素加入,有白色析出物分布在基体内和晶界处。EDS成分分析表明,Ce元素难溶于基体相内,Ce元素会以CaCe_(2)相的形式存在晶界处,对(Fe_(81)Ga_(15.5)Al_(3.5))_(100-x)Ce_(x)金的磁致伸缩性能产生影响。在x=0.2%时,合金平行磁致伸缩系数(λ//)达到182×10^(-6),相比Fe_(81)Ga_(15.5)Al_(3.5)合金有小幅提升。并且作为软磁材料,该成分的合金兼备高饱和磁化强度(Ms)和低矫顽力(Hc)的特性,适合实际生产应用。The microstructure and magnetic properties of(Fe_(81)Ga_(15.5)Al_(3.5))_(100-x)Ce_(x)(x=0,0.2,0.4,0.6,0.8,1.0)alloy were studied by doping Ce element into Fe_(81)Ga_(15.5)A1_(3.5) alloy as matrix.The results show that the grain shape of Fe_(81)Ga_(15.5)Al_(3.5) alloy is columnar,and the grain shape transmutes to the dendritic after doping Ce element.The phase structure of(Fe_(81)Ga_(15.5)Al_(3.5))_(100-x)Ce_(x) alloy is dominated by A2 phase when the content of Ce element keeps low.When x>0.8at%,the alloy phase structure consist of A2 phase and CeCa_(2) phase.The[100]crystal orientation of alloy is altered after the addition of Ce element and the lattice constant of the alloy is decreased with the increase of Ce content.Under scanning electron microscope,the dark precipitates in Fe_(81)Ga_(15.5)Al_(3.5) alloy matrix are distributed disorderly,and the white precipitates are started to widespread in matrix and grain boundaries with the addition of Ce element.EDS analysis results demonstrated that Ce element is insoluble in the matrix phase and exists at the grain boundary in the form of CaCe_(2) phase,exerting an effect on the magnetostriction properties of(Fe_(81)Ga_(15.5)Al_(3.5))_(100-x)Ce_(x).The parallel magnetostrictive(λ_(∥))coefficient of the alloy reaches 182×10^(-6),which is slightly improved compared with Fe_(81)Ga_(15.5)Al_(3.5) at x=0.2at%.As a soft magnetic material,the alloy has the characteristics of both high saturation magnetization(M s)and low coercivity(H c)and thus it is suitable for practical application.

关 键 词：Fe-Ga-Al合金 CE掺杂 微观组织 磁性能 

分 类 号：TB34[一般工业技术—材料科学与工程]