Tb-dependent phase transitions in Fe-Ga functional alloys

Emdadi, Aliakbar; Palacheva, V.V.; Балагуров, А.М.; Бобриков, И.А.; Чеверикин, В. В.; Cifré, J.; Golovin, I.S.

doi:10.1016/j.intermet.2017.10.017

Cited by 30 publications

(13 citation statements)

References 37 publications

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“…Anelastic effects for phase transitions at higher temperatures have as yet not been reported in the literature. Doping Fe-Ga with rare earth elements enhances magnetostriction in Fe- (17)(18)(19)Ga alloys by creating local inhomogeneities [9][10][11] and stabilizes the metastable bcc-derivative phase in as cast Fe-27Ga alloys by preventing L1 2 phase nucleation on the D0 3 grain boundaries 7,[12][13][14] . The structure of metastable Fe-27Ga type alloys before their transition to equilibrium L1 2 phase may show several metastable phases (A2, B2, D0 3 ), the size of which, as reported in the literature, can be from nano (e.g.…”

Section: Introductionmentioning

confidence: 99%

Anelasticity of Phase Transitions and Magnetostriction in Fe-(27-28%)Ga Alloys

et al. 2018

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Several aspects of anelastic behavior of Fe-(27-28%)Ga-Tb alloys are considered in this paper: (i) the phase transitions from a metastable to an equilibrium phase and phase transitions between equilibrium phases at higher temperatures in as cast alloys, (ii) the nature of corresponding three transient anelastic effects, (iii) the formation of an intrinsic composite microstructure with a different ratio between the bcc-derivative metastable and fcc-derivative equilibrium phases that have different magnetostriction and the effect of alloys doping by Tb to stabilize the metastable phase with high positive values of magnetostriction.

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Section: Introductionmentioning

confidence: 99%

Anelasticity of Phase Transitions and Magnetostriction in Fe-(27-28%)Ga Alloys

et al. 2018

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“…Our studies of thermally activated (Snoek and Zener relaxations), transient (due to A2 ↔ D0 3 , D0 3 → L1 2 , L1 2 → D0 19 , D0 19 → B2 phase transitions), and amplitude-dependent (damping) effects in Fe–Ga alloys were strengthened by cooperation with colleagues from China, Spain, Switzerland, Taiwan, and the US. Studies of phase transitions were supported by parallel real-time neutron diffraction measurements at JINR, Dubna [ 24 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ]. A review of frequency- and temperature-dependent anelastic effects in Fe–Ga alloys was presented by the author of this paper at the 18th International Conference on Internal Friction and Mechanical Spectroscopy (ICIFMS-18, Brazil, 2018).…”

Section: Introductionmentioning

confidence: 99%

Anelastic Effects in Fe–Ga and Fe–Ga-Based Alloys: A Review

Golovin

2023

Materials

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Fe–Ga alloys (GalFeNOLs) are the focus of attention due to their enhanced magneto-elastic properties, namely, magnetostriction in low saturation magnetic fields. In the last several years, special attention has been paid to the anelastic properties of these alloys. In this review, we collected and analyzed the frequency-, amplitude-, and temperature-dependent anelasticity in Fe–Ga and Fe–Ga-based alloys in the Hertz range of forced and free-decay vibrations. Special attention is paid to anelasticity caused by phase transitions: for this purpose, in situ neutron diffraction tests with the same heating or cooling rates were carried out in parallel with temperature dependencies measurements to control ctructure and phase transitions. The main part of this review is devoted to anelastic effects in binary Fe–Ga alloys, but we also consider ternary alloys of the systems Fe–Ga–Al and Fe–Ga–RE (RE—Rare Earth elements) to discuss similarities and differences between anelastic properties in Fe–Ga and Fe–Al alloys and effect of RE elements. We report and discuss several thermally activated effects, including Zener- and Snoek-type relaxation, several transient anelastic phenomena caused by phase transitions (D03 ↔ A2, D03 → L12, L12 ↔ D019, D019 ↔ B2, Fe13Ga9 → L12+Fe6Ga5 phases), and their influence on the above-mentioned thermally activated effects. We also report amplitude-dependent damping caused by dislocations and magnetic domain walls and try to understand the paradox between the Smith–Birchak model predicting higher damping capacity for materials with higher saturation magnetostriction and existing experimental results. The main attention in this review is paid to alloys with 17–20 and 25–30%Ga as the alloys with the best functional (magnetostriction) properties. Nevertheless, we provide information on a broader range of alloys from 6 to 45%Ga. Due to the limited space, we do not discuss other mechanical and physical properties in depth but focus on anelasticity. A short introduction to the theory of anelasticity precedes the main part of this review of anelastic effects in Fe–Ga and related alloys and unsolved issues are collected in summary.

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“…Recently, the rare-earth-doped Fe-Ga alloys have received more attention, due to the rare-earth doping can efficiently improve the magnetostrictive properties of binary Fe-Ga alloys. [7][8][9][10][11][12][13][14][15][16][17][18][19][20] Furthermore, the magnetostrictive properties of composite materials are closely related to the inherent magnetostriction of magnetostrictive alloy powders constituting composite materials. If we use rare-earth-doped Fe-Ga alloys instead of the binary Fe-Ga alloys, it may obtain novel composite materials with better magnetostrictive properties than that of binary Fe-Ga composite materials.…”

Section: Introductionmentioning

confidence: 99%

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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Tb-dependent phase transitions in Fe-Ga functional alloys

Cited by 30 publications

References 37 publications

Anelasticity of Phase Transitions and Magnetostriction in Fe-(27-28%)Ga Alloys

Anelasticity of Phase Transitions and Magnetostriction in Fe-(27-28%)Ga Alloys

Anelastic Effects in Fe–Ga and Fe–Ga-Based Alloys: A Review

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

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