Research Progress on the Enhanced Magnetostrictive Properties of Fe-Ga Alloys Induced by Trace Rare Earth Doping
WANG Rui1, ZHAO Xuan1, ZHAO Lijuan1, YAN Jing1, TIAN Xiao1, YAO Zhanquan2
1 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
Abstract: Magnetostrictive material is a new kind of smart material, which has important application value in robot, sensor and displacement controller. Compared with traditional magnetostrictive material and commercialized giant magnetostrictive materials, the new Fe-Ga magnetostrictive material has excellent characteristics of more practical and application prospect, such as high strain at low magnetic field, good mechanical pro-perty, low temperature dependence, low cost, and so on. So Fe-Ga alloy become a hot research topic in the field of condensed matter physics and materials science. The early researches related to Fe-Ga alloy mainly focused on the single-crystal Fe-Ga alloy. But It’s preparation process is difficult and the cost is high, so it is difficult to be widely used. In order to broaden the application range of Fe-Ga alloy, people begin to pay attention to polycrystalline Fe-Ga alloy. However, the low magnetostrictive coefficient of polycrystalline Fe-Ga alloy prepared by conventional mel-ting method limits its practical application. Therefore, improving the magnetostrictive property of polycrystalline Fe-Ga alloy is the key to its wide application. The structure of the alloy determines its properties, and the structure of the alloy is closely related to the composition and preparation process of the alloy. In order to improve the magnetostrictive coefficient of polycrystalline Fe-Ga alloy, researchers have done a lot of research work. In recent years, rare earth elements with special 4f electron structure have attracted more and more attention in the field of magnetostriction due to their excellent magnetic properties. Light trace rare earth element Tb, Dy, Ce, Y, Sm and Pr were doped into Fe-Ga alloy, and it was found that the magnetostrictive property of Fe-Ga alloy was significantly improved. However, the conclusion about the magnetostriction mechanism of rare earth doped Fe-Ga alloy is still inconsistent. Some researchers believe that the improvement of magnetostrictive properties is due to the formation of rare earth rich phase in Fe-Ga alloy due to the doping of rare earth, while others believe that the main reason is that the alloy has a preferential orientation along 〈100〉 due to the doping of rare earth. In recent years, some researchers believe that the large magnetostriction is mainly due to the large tetragonal distortion caused by the rare earth atoms entering the A2 matrix of Fe-Ga alloy. However, it is still not clear how rare earth doping cause large tetragonal distortion of A2 matrix in Fe-Ga alloy and what interaction of rare earth dopants with tetragonal nano-heterogeneities modified DO3 phase in A2 matrix. In this paper, we first analyzed the reason of selection of rare earth elements doped Fe-Ga alloy. Then, the influence of rare earth element doping on Fe-Ga alloy property was analyzed. Finally, the theoretical mechanism of large magnetostrictive property of Fe-Ga alloy caused by rare earth element doping was summarized in detail, and the future development direction of this kind of alloy was prospected.
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2020, Vol. 34 
