Influences of rare earth element Ce-doping and melt-spinning on microstructure and magnetostriction of Fe83Ga17 alloy

Yao, Zhanquan; Tian, Xiaobo; Jiang, Liping; Hu, Hao; Zhang, Guangrui; Wu, Sujuan; Zhao, Zhonglong; Gerile, Naren

doi:10.1016/j.jallcom.2015.03.009

Cited by 29 publications

(27 citation statements)

References 31 publications

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“…This difference in atomic dimensions leads to low solid solubility of Er in the FeGa matrix, and thus, Er exists mostly in the precipitates. This characteristic dual-phase microstructure has been observed previously in other rare-earth doped FeGa alloys [20,21,22,26,27], and it is considered to be advantageous for improving the magnetostrictive response and mechanical properties of this materials system. …”

Section: Resultssupporting

confidence: 68%

“…It is important to note that with an exception of one report concerning Fe 83 Ga 17 Ce 0.8 [22], the Fe 83 Ga 17 Er 0.6 sample demonstrates higher magnetostriction than any other [110]-textured directionally-solidified FeGa alloy synthesized to date.…”

Section: Resultsmentioning

confidence: 94%

“…It is further hypothesized that enhancement of magnetostriction may be achieved either by the application of a compressive pre-stress or by increasing the solid solubility of Er in the bcc FeGa matrix through quenching during the cooling phase of the sample fabrication technique. Indeed, previous studies in the FeGa literature demonstrate that the saturation magnetostriction of Fe 83 Ga 17 alloys can be remarkably increased by the melt spinning method [22,38]. It is, however, critical to note that it is difficult to experimentally measure the magnetostriction of melt-spun ribbons, as the grains in the sample usually grow perpendicular to the direction of sample growth [22].…”

Section: Resultsmentioning

confidence: 99%

“…Indeed, previous studies in the FeGa literature demonstrate that the saturation magnetostriction of Fe 83 Ga 17 alloys can be remarkably increased by the melt spinning method [22,38]. It is, however, critical to note that it is difficult to experimentally measure the magnetostriction of melt-spun ribbons, as the grains in the sample usually grow perpendicular to the direction of sample growth [22]. Moreover, due to large demagnetizing effects, shape anisotropy in FeGa ribbon samples typically leads to high magnetic saturation fields [38].…”

Section: Resultsmentioning

confidence: 99%

“…While tiny amounts of small interstitial atoms (C, B or N) have a slight but favorable effect on the magnetostriction of FeGa (particularly at high atomic compositions of Ga) [18,19]. More recent studies indicate that the magnetostriction of this compound can be significantly increased by adding small amounts of rare-earth elements ranging from La to Lu [20,21,22,23,24,25,26,27,28]. A phenomenological model based on the rare-earth crystal field interaction, proposed by He et al, suggests that the best trace dopants are the light rare earths, Ce and Pr (up to 0.2 at.% doping), which give a transverse magnetostriction of up to 800 ppm [24].…”

Section: Introductionmentioning

confidence: 99%

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Giant Enhancement of Magnetostrictive Response in Directionally-Solidified Fe83Ga17Erx Compounds

et al. 2018

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We report, for the first time, correlations between crystal structure, microstructure and magnetofunctional response in directionally solidified [110]-textured Fe83Ga17Erx (0 < x < 1.2) alloys. The morphology of the doped samples consists of columnar grains, mainly composed of a matrix phase and precipitates of a secondary phase deposited along the grain boundary region. An enhancement of more than ~275% from ~45 to 170 ppm is observed in the saturation magnetostriction value (λs) of Fe83Ga17Erx alloys with the introduction of small amounts of Er. Moreover, it was noted that the low field derivative of magnetostriction with respect to an applied magnetic field (i.e., dλs/dHapp for Happ up to 1000 Oe) increases by ~230% with Er doping (dλs/dHapp,FeGa= 0.045 ppm/Oe; dλs/dHapp,FeGaEr= 0.15 ppm/Oe). The enhanced magnetostrictive response of the Fe83Ga17Erx alloys is ascribed to an amalgamation of microstructural and electronic factors, namely: (i) improved grain orientation and local strain effects due to deposition of Er in the intergranular region; and (ii) strong local magnetocrystalline anisotropy, due to the highly anisotropic localized nature of the 4f electronic charge distribution of the Er atom. Overall, this work provides guidelines for further improving galfenol-based materials systems for diverse applications in the power and energy sector.

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Section: Resultssupporting

confidence: 68%

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Giant Enhancement of Magnetostrictive Response in Directionally-Solidified Fe83Ga17Erx Compounds

et al. 2018

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Flexible Pr‐Doped Fe–Ga Composite Materials: Preparation, Microstructure, and Magnetostrictive Properties

et al. 2020

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Herein, the manufacture process and the results of investigations into the microstructure and magnetic properties of flexible Fe83Ga17Prx (x = 0, 0.2, 1.0) composite materials are presented. The Fe83Ga17Prx (x = 0, 0.2, 1.0) alloy powders with particle size of 75 μm and epoxy binder are bonded at a weight ratio of 2:1, and then orient under a constant applied magnetic field of 10 kOe and airdry 12 h, finally processed into composite material. The microstructure and magnetic properties of as‐cast alloy, unoriented (UN), and oriented (OR) composite materials are examined by X‐ray diffractometer (XRD), scanning electron microscopy and energy dispersive spectrometry (SEM/EDS), vibrating sample magnetometer (VSM), and strain gauge method. The results show that the Pr‐doped Fe–Ga as‐cast samples consist of A2 matrix phase and rare‐earth‐rich phase. As the Pr content increases, the grain sizes of A2 matrix phase decrease. The OR composite materials show significant magnetic anisotropy. Compared with as‐cast and UN composite materials, the magnetostriction of OR composite materials increase. The highest value of magnetostriction (310 ppm) is obtained in the flexible Fe83Ga17Pr1.0 composite material.

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Interaction of Trace Rare‐Earth Dopants and Nanoheterogeneities Induces Giant Magnetostriction in Fe‐Ga Alloys

Jiang

et al. 2018

Adv Funct Materials

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The discovery of a tenfold increase in magnetostriction of Fe by alloying nonmagnetic Ga was a breakthrough in magnetostrictive materials. The large magnetostriction is attributed to tetragonal nanoheterogeneities dispersed in the bcc matrix. A further remarkable fivefold increase is achieved by trace rare earth doping (<1 at%) up to a value of ≈1500 ppm, more than 50 times that of pure iron. However, it remains a mystery why trace rare earth dopants can induce such giant magnetostriction. Here, it is found that interaction of rare earth dopants with the nanoheterogeneities produces the giant magnetostriction, through a combination of experimental studies, firstprinciples calculation and phase field simulations. The dopants tend to enter the nanoheterogeneities, increasing their distortion thereby creating a larger tetragonal distortion of the matrix as well as increased magnetocrystalline anisotropy. A mesoscopic model is developed using phase field simulation showing that the bulk tetragonal distortion arises mainly from those nanoheterogeneities with fixed Ga-Ga pairs parallel to the applied magnetic field. Increased tetragonal distortion of the doped nanoheterogeneities leads to further distortion of the matrix. The results deepen the understanding of heterogeneous magnetostriction, and will guide the search for new magnetic materials with giant magnetostriction.

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Influences of rare earth element Ce-doping and melt-spinning on microstructure and magnetostriction of Fe83Ga17 alloy

Cited by 29 publications

References 31 publications

Giant Enhancement of Magnetostrictive Response in Directionally-Solidified Fe83Ga17Erx Compounds

Giant Enhancement of Magnetostrictive Response in Directionally-Solidified Fe83Ga17Erx Compounds

Flexible Pr‐Doped Fe–Ga Composite Materials: Preparation, Microstructure, and Magnetostrictive Properties

Interaction of Trace Rare‐Earth Dopants and Nanoheterogeneities Induces Giant Magnetostriction in Fe‐Ga Alloys

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