Mechanical spectroscopy of phase transitions in Fe–(23–38)Ga-RE alloys

Golovin, I.S.; Mohamed, A.K.; Palacheva, V.V.; Zanaeva, E.N.; Cifré, J.; Samoylova, Nataliya Yu.; Балагуров, А.М.

doi:10.1016/j.jallcom.2021.159882

Cited by 12 publications

(19 citation statements)

References 40 publications

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“…Boundary between these groups cannot be defined precisely as the first-order transitions are controlled by both temperature and time. It was recently proved that long-term aging (300–1800 h) below 600 °C leads to the A2 (or D0 3 ) to A1 (or L1 2 ) transition even in the alloys with 16–17%Ga [ 16 , 17 ], while in experiments with the constant heating and cooling rate (1–2 K/min), these transitions take place only in the alloys with 24–25%Ga and more [ 19 , 49 , 60 , 61 ].…”

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

confidence: 99%

“…Several dozens of research papers are focused on particular elastic and anelastic effects in different Fe–Ga alloys. The main papers which report anelastic effects in Fe–Ga alloys in a wide range of Ga concentrations used for this review are [ 39 , 49 , 59 , 60 , 61 ]. As a rule of thumb, most authors denoted in their papers the thermally activated effects/peaks as P1, P2, P3, etc., and the transient effects as P Tr1 , P Tr2 , P Tr3 , etc.…”

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

confidence: 99%

“…Analysis of TDIF spectra for a wide range of Ga concentration was done in several papers by Golovin et al for 8–33%Ga [ 11 , 49 ], for 19, 27, and 28%Ga [ 47 , 50 ], and for 23–38%Ga [ 60 ]. The important feature of most of these studies is the parallel real-time internal friction and neutron diffraction studies using the same materials with the same heating and cooling rates.…”

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

confidence: 99%

“…Figure 17 (23–25%Ga) and Figure 18 (25.5–28%Ga) give an overview of the TDIF curves below 600 °C measured at forced bending vibrations with 6 frequencies and heating rate of 2 K/min. A total of 2 thermally activated effects, P1 and P2 peaks (Snoek and Zener effects), and a transitory effect at 475–520 °C are typical for these alloys [ 49 , 60 ].…”

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

confidence: 99%

“…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 ]. An interesting analysis of the core loss separation and magnetic Barkhausen noise at the high-frequency range is recently reported for Fe–19Ga–RE alloys by Bircakova et al [ 65 ].…”

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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