High damping in Fe-Ga-La alloys: Phenomenological model for magneto-mechanical hysteresis damping and experiment

Sun, Meng; Балагуров, А.М.; Бобриков, И.А.; Wen, Wen; Golovin, I.S.; Fang, Qingming

doi:10.1016/j.jmst.2020.07.043

Cited by 21 publications

(10 citation statements)

References 49 publications

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“…The inconsistency between Smith and Birchak model [ 5 , 128 ] and existing experimental results for α-Fe-based alloys was partly resolved by Sun et al for Fe–21wt.%Ga–La [ 54 , 56 ]. In ferromagnetic alloys, the damping mechanism is divided into non-magnetic damping (NMD) caused by stress-induced motion of defects, such as point defects, dislocations, grain boundaries, and magneto-mechanical damping (MMD).…”

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

confidence: 99%

“…Sun et al also underlined that although damping is closely related to saturated magnetostriction, there are obvious differences between them [ 54 ]. For magnetostrictive applications, it is usually pursued that the restoring force opposing the movement of DWs is as small as possible because it can not only reduce the energy loss but also reduce the critical magnetic field for the saturated magnetostriction.…”

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

confidence: 99%

“…Beshers et al proposed a model of Landau’s arrangement of magnetic domains [ 130 ] in which the anelastic strain (ε an ) is described by the change in volume fraction of the closed domains, and stress exerts a force on the 90° domain walls mainly. Sun et al [ 54 ] demonstrated that a normal distribution of internal stress in Fe–21%Ga–xLa alloys better fits experimental data compared with Maxwell’s law. Altogether, it leads to more complex relationship between anelastic strain and magnetostriction.…”

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

confidence: 99%

“…It is well known that the interaction between second phase and magnetic domain influences the damping capacity of magnetically soft alloys. The total average resistance (σ ave ) to the movement of the domain in the matrix with particles of a second phase is [ 54 ]: σ ave = σ S + (σ l,a + σ l.d ) + σ n , where σ S is the average stress opposing the movement of DWs due to crystalline lattice distortion of the matrix; σ l,a and σ l,d are the resistances related to the increasing area energy of DW and the increasing demagnetization energy induced by the second phase, respectively; and σ n is other forces that hinder the DW movement.…”

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

confidence: 99%

“…Research groups in China have added several important (D0 3 → B2 → A2 transition, distinguished between Zener relaxation in D0 3 and L1 2 phases, etc.) details and proposed new approaches for better understanding amplitude-dependent damping mechanisms in Fe–Ga alloys [ 52 , 53 , 54 , 55 , 56 , 57 ]. Most recently, these results were presented at the 19th ICIFMS (2022, Rome) [ 58 , 59 , 60 , 61 , 62 , 63 , 64 ].…”

Section: Introductionmentioning

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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