Non-equilibrium time-temperature-transformation diagram for enhancing magnetostriction of Fe-Ga alloys

Zhang, Yiqun; Gou, Junming; Yang, Tao; Ke, Yubin; Ma, Tianyu

doi:10.1016/j.actamat.2022.118548

Cited by 6 publications

(3 citation statements)

References 60 publications

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“…Our experimental results do not support effectiveness of this method, and we believe that even though this approach helps to increase non-magnetic contribution to damping, it significantly decreases magneto-mechanical component of damping. It is also important to remember that D0 3 and L1 2 phases have opposite signs of magnetostriction; as a result, their saturation magnetostriction decreases and may even be equal to zero [ 46 , 131 , 132 ], which according to the Smith and Birchak approach, leads also to zero magnetomechanical damping. Indeed, most recently published results by another group [ 63 ] clearly confirm that two-phase D0 3 + L1 2 Fe–27Ga alloy may have different damping mechanisms at lower and higher strain amplitude: D0 3 phase with higher magnetic damping than non-magnetic damping plays a dominant role under a lower strain amplitude, while L1 2 phase with higher non-magnetic damping than magnetic damping plays the main role under a higher strain amplitude.…”

Section: Anelastic Effects In Binary Fe–ga and Ternary Fe–ga-based Al...mentioning

confidence: 99%

“…The activation energies of the Zener relaxation in Fe–26Al alloy and diffusion [ 146 ] in the B2 and D0 3 phases have the same sequence, i.e., H B2 < H D03 . The activation energies of the Zener relaxation are only slightly lower than those of inter-diffusion in B2 [ 132 ], practically the same as those of the Al tracer self-diffusion in B2 [ 147 ], and slightly higher than that of the Fe tracer self-diffusion in the B2 and D0 3 [ 146 ]. This proves mechanical spectroscopy to be a useful tool for a relatively quick estimation of the activation energies for atoms diffusion in a substitutional solid solution in different ranges of the phase diagram.…”

Section: Anelastic Effects In Binary Fe–ga and Ternary Fe–ga-based Al...mentioning

confidence: 99%

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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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Section: Anelastic Effects In Binary Fe–ga and Ternary Fe–ga-based Al...mentioning

confidence: 99%

Section: Anelastic Effects In Binary Fe–ga and Ternary Fe–ga-based Al...mentioning

confidence: 99%

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

Golovin

2023

Materials

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“…And related studies [12][13][14] reported that the development of oriented texture in the rolled Fe-Ga sheets was also an effective way to improve the magnetostrictive strain. In addition, Zhang et al [15] reported that the A2 single-phase structure and the suppression of harmful phases in Fe-Ga alloys contributed to high magnetostrictive performance. However, only single structure in terms of rods, sheets, and wires can be prepared by these methods, which cannot satisfy the diversified demands in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Laser-beam powder bed fusion of magnetostrictive Fe₈₁Ga₁₉ alloys: parameter optimization, microstructural evolution and magnetostrictive properties

Yao,

Deng,

Wang

et al. 2024

Phys. Scr.

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Magnetostrictive Fe-Ga alloys, featuring with good machinability, high Curie temperature, and high permeability, have received increasing attention in fields such as actuators, implants, and energy harvesting. Unfortunately, bulk polycrystalline Fe-Ga alloys usually suffer poor magnetostrictive strains compromised by the randomness of grain structure and the intricate phase constitution. The current study was centered on the fabrication of bulk polycrystalline Fe81Ga19 alloys with tailored grain morphology and phase arrangement utilizing laser-beam powder bed fusion (LPBF) technology. Particular emphasis was laid on investigating the repercussions of LPBF process parameters on the microstructure and magnetostrictive performance. The findings illustrated a non-linear interplay between laser power and the relative density of laser powder bed fusion-fabricated (LPBFed) Fe81Ga19 alloys, marked by an initial augmentation followed by a subsequent decrement. Similarly, a consistent trend was observed for the LPBFed alloys at varying scan speeds. In particular, the LPBFed Fe81Ga19 alloys exhibited a highest density at optimized process parameters (laser power set at 120 W paired with a scan speed of 100 mm/s) due to suitable laser energy input during LPBF process. It was experimentally shown that elongated columnar grains and disorder A2 phase structures were obtained within the alloys attibutes to the high temperature gradient and rapid cooling kinetics intrinsic to LPBF, contributing to a desirable magnetostrictive strain of ~87 ppm for bulk polycrystalline Fe81Ga19 alloys. Moreover, a good dynamic magnetostrictive response of the LPBFed alloys was confirmed by the near-synchronous variations between magnetostrictive behavior and alternating magnetic fields. It can be derived from these findings that LPBF process may be a promising method to prepare bulk magnetostrictive Fe-Ga alloys for versatile applications.

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Rapid-thermal-process pre-treatment promoted precipitation towards strengthening hard magnetism of Sm2Co17-type magnets

Song,

Jia,

Liu

et al. 2024

Acta Materialia

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Non-equilibrium time-temperature-transformation diagram for enhancing magnetostriction of Fe-Ga alloys

Cited by 6 publications

References 60 publications

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

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

Laser-beam powder bed fusion of magnetostrictive Fe₈₁Ga₁₉ alloys: parameter optimization, microstructural evolution and magnetostrictive properties

Rapid-thermal-process pre-treatment promoted precipitation towards strengthening hard magnetism of Sm2Co17-type magnets

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Non-equilibrium time-temperature-transformation diagram for enhancing magnetostriction of Fe-Ga alloys

Cited by 6 publications

References 60 publications

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

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

Laser-beam powder bed fusion of magnetostrictive Fe81Ga19 alloys: parameter optimization, microstructural evolution and magnetostrictive properties

Rapid-thermal-process pre-treatment promoted precipitation towards strengthening hard magnetism of Sm2Co17-type magnets

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Laser-beam powder bed fusion of magnetostrictive Fe₈₁Ga₁₉ alloys: parameter optimization, microstructural evolution and magnetostrictive properties