Microstructure and Magnetostriction of Fe, Fe83Ga17 and Fe83Ga17Pr0.3 Alloys: a Comparative Study
ZHAO Lijuan1, TIAN Xiao1, YAO Zhanquan2, JIANG Liping3
1 Key Laboratory for Physics and Chemistry of Functional Materials, School of Physics and Electronic Information, Inner Mongolia Normal University, Hohhot 010022; 2 School of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018; 3 Baotou Research Institute of Rare Earths, Baotou 014030
Abstract: The present work aimed to comparatively analyze microstructure and magnetostriction of Fe, and Fe83Ga17 and Fe83-Ga17Pr0.3 magnetostrictive alloys. We successfully prepared the alloys by employing a non-consumable vacuum arc melting furnace and applying a protective argon atmosphere, and observed crystal structures and surface morphologies of the alloys via X-ray diffraction (XRD), optical microscopy (OM) and scanning electron microscopy (SEM) combined with energy dispersive spectroscopy (EDS), respectively. The magnetostriction coefficients of the alloys were measured by means of resistance strain method. The results indicated that Fe and Fe83Ga17 alloy consist of a single phase of A2 with bcc structure, while the Fe83Ga17Pr0.3 alloy is composed of A2 phase and a small amount of Pr-rich phase. The Pr doping into Fe83Ga17 alloy facilitates the preferred growth in (100) orientation of A2 phase in the alloy. The microstructures of the Fe, Fe83Ga17 and Fe83Ga17Pr0.3 alloys present anisometric morphology with strip-like grains, the equiaxial morphology with coarse grains and a columnar structure with fine grains, respectively. The magnetostriction coefficient of Fe is negative, whereas the magnetostriction coefficients of Fe83Ga17 and Fe83Ga17Pr0.3 alloys are positive. The magnetostrictions of three alloys can be sequenced as Fe83Ga17Pr0.3>Fe83Ga17>Fe.
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2018, Vol. 32 
