Influence of rare earth element terbium doping on microstructure and magnetostrictive properties of Fe_(81)Al_(19) alloy  

作　　者：Rui Wang Xiao Tian Zhanquan Yao Xuan Zhao Hongbo Hao 

机构地区：[1]Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials,School of Physics and Electronic Information,Inner Mongolia Normal University,Hohhot 010022,China [2]School of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China [3]State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earths,Baotou 014030,China

出　　处：《Journal of Rare Earths》2022年第3期451-456,I0004,共7页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(51661027);the Natural Science Foundation of Inner Mongolia(2019MS05002,2020MS05075)。

摘　　要：Fe_(81)Al_(19)Tb_(x)(x=0,0.05,0.1,0.2,0.3,0.4)alloys were prepared by a non-consumable vacuum arc melting technique under an inert argon gas atmosphere.The microstructures of the alloys were studied by X-ray diffraction(XRD)and scanning electron microscopy combined with an energy dispersive spectroscopy(SEM/EDS).The magnetic properties and magnetostriction coefficients of the alloys were measured by a vibrating sample magnetometer(VSM)and adifferential resistive strain sensor,respectively.The results show that the Fe_(81)Al_(19)alloy consists of a single A2 phase with bcc structure,whereas the Tb doped Fe_(81)Al_(19)alloys are composed of the A2 phase and a small amount of rare earth-rich phase.The doping of the rare earth element Tb makes the Fe_(81)Al_(19)alloy preferentially oriented along with the<100>crystal direction.With the increase of Tb content,the magnetostriction coefficient of the alloy first increases and then decreases.When x=0.1,the magnetostriction coefficient reaches the maximum,which is 146×10^(−6).Compared with the as-cast Fe_(81)Al_(19)alloy(27×10^(−6)),it increases by 441%.The enhanced magnetostrictive properties are mainly attributed to the preferred orientation along<100>of A2 phase of the Tb doped Fe_(81)Al_(19)alloys and lattice distortion caused by the small amount of rare earth atoms entering the Fe-Al alloy lattice.

关 键 词：Fe-Al alloy MAGNETOSTRICTION Lattice distortion Preferred orientation Rare earths 

分 类 号：TG132[一般工业技术—材料科学与工程]