In situ study of order-disorder transitions and anelasticity in Fe-26Al alloy

Балагуров, А.М.; Sumnikov, S.V.; Cifré, J.; Palacheva, V.V.; Chubov, D.G.; Golovin, I.S.

doi:10.1016/j.jallcom.2022.167663

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…According to the standard diffraction pattern of bcc iron, disorder A2 phase structure was noted for both the gas-atomized powders and S2 through the observation of three peaks indexed to (110), (200), and (211) planes, suggesting no crystal structure changes before and after LPBF process. It should be pointed out that there was probably an overlap of A2 and D0 3 phase structures in XRD diffraction peaks due to the similar crystal structures of the two phases and similar scattering factors of Fe atoms and Ga atoms, and tiny amounts of D0 3 phase structure might be annihilated in the background of A2 phase structure [8,[52][53][54]. To sum up, the Fe 81 Ga 19 pre-alloyed powders with A2 disorder A2 phase structure were prepared by gas atomization, moreover, metastable A2 phase structure was still maintained in the LPBFed bulk alloys.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…In Fe–(26–27)Al alloys, only second-order transitions—“ordering (of B2 and D0 3 types) ↔ disordering”—take place. At heating, the recorded sequence of phase transitions for the water-quenched sample is B2 → D0 3 → B2 → A2 ( Figure 3 a), whereas, in the furnace-cooled and as-cast alloy, it is D0 3 → B2 → A2 [ 23 ].…”

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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Carbon diffusivity by means of Snoek relaxation in ternary Fe-26 at%(Al+Ga) alloys with different Al/Ga ratio

Palacheva,

Cifre,

Chang

et al. 2024

Journal of Alloys and Compounds

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In situ study of order-disorder transitions and anelasticity in Fe-26Al alloy

Cited by 4 publications

References 27 publications

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

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

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

Carbon diffusivity by means of Snoek relaxation in ternary Fe-26 at%(Al+Ga) alloys with different Al/Ga ratio

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In situ study of order-disorder transitions and anelasticity in Fe-26Al alloy

Cited by 4 publications

References 27 publications

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

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

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

Carbon diffusivity by means of Snoek relaxation in ternary Fe-26 at%(Al+Ga) alloys with different Al/Ga ratio

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

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

Carbon diffusivity by means of Snoek relaxation in ternary Fe-26 at%(Al+Ga) alloys with different Al/Ga ratio