摘要
为了改善Fe-Ga合金的磁致伸缩性能,采用真空非自耗电弧炉制备了Fe_(83)Ga_(17)Ce_x(x=0.0,0.2,0.4,0.6,0.8,1.0)合金,用X射线衍射仪(XRD)和扫描电镜及能谱仪(SEM/EDS)分析了合金的微结构,用电阻应变法测量了合金的磁致伸缩性能.结果表明:Fe_(83)Ga_(17)合金由单一的bcc结构A2相组成.而添加稀土Ce后,除x=0.2合金外,Fe_(83)Ga_(17)Ce_x合金主要由bcc结构的A2相和CeFe_2第二相组成.此外,Fe_(83)Ga_(17)合金的微观组织是晶粒粗大的等轴晶,而Fe_(83)Ga_(17)Ce_(0.8)合金的微观组织是晶粒细小的柱状晶.与Fe_(83)Ga_(17)对照合金相比,除x=0.2合金的磁致伸缩系数略小于对照合金外,其他添加稀土Ce后的合金样品磁致伸缩系数均明显增加.添加稀土Ce后,Fe_(83)Ga_(17)Ce_x合金的磁致伸缩系数随稀土Ce含量的增加呈现出先增加后减小的变化趋势,x=0.8合金的磁致伸缩系数最大,在557 kA/m外加磁场下,磁致伸缩系数达到356×10^(-6).
Fe-Ga alloy, which was a new type of magnetostrictive netostriction, low hysteresis, high tensile strength and good machinability, However, the magnetostrictive properties of the practically prepared Fe-Ga material with high mag- has been widely studied. alloys were quite small at present. In order to improve magnetostrictive properties of the Fe-Ga alloy, the Fes3GalTCex （x=0.0, 0.2, 0.4, 0.6, 0.8, 1.0） alloys were prepared by non-consumable vacuum arc melting furnace using high purity elements under a protective argon atmosphere. The crystal structures and surface morphologies of the alloys were intensively studied by X-ray diffraction （XRD） and scanning electron microscopy （SEM） combined with energy-dispersive spectroscopy （EDS）, respectively. The magnetostriction coef- ficients of the alloys were measured by means of the resistance strain method. ,The results showed that Fes3Gal7 alloy is composed only of a single phase of A2 with bcc structure. However, the Fes3GalTCex alloys are composed of the A2 phase and a small amount of CeFe2 secondary phase with MgCu2 structure except the alloy with x=0.2, which is composed only of a single phase of A2. Furthermore,the microstructure of the Fes3Gal7 alloy presents the equiaxial morphology with coarse grains. How- ever, the microstructure of the Fes3CalTCe0.s alloy is a columnar structure with fine grains. Compared with the Fes3Ga17 alloy, the magnetostriction coefficients of the Fes3Gal7Cex alloys are increased sig- nificantly except the alloy with x=0.2. The magnetostriction coefficient of the Fes3GalTCe0.2 alloy （81~10-6） is slightly smaller than that of the FesuGal7 alloy （84~10-6）. With the increase of the rare earth Ce content, the magnetostriction coefficients of the Fes3GalTCex alloys increase firstly and then decrease. When x=0.8, the maximum magnetostriction coefficient of 356~ 10-6 is obtained at the magnetic field of 557 kA/m. For the Fes3GalTCex alloys except the alloy with x=0.2, the noticeable increase of the magnetostriction coef
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第1期87-91,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金项目51141005
国际合作研究项目2010DFA52570资助~~
