Low-temperature metastable-to-equilibrium phase transitions in Fe–Ga alloys

Mohamed, A.K.; Palacheva, V.V.; Чеверикин, В. В.; Vershinina, T. N.; Балагуров, А.М.; Muralikrishna, G. Mohan; Esakkiraja, Neelamegan; Divinski, Sergiy V.; Wilde, Gerhard; Golovin, I.S.

doi:10.1016/j.intermet.2022.107540

Cited by 8 publications

(7 citation statements)

References 32 publications

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“…The structural phase diagrams (both equilibrium and metastable) of double alloys are well known and described in detail (see, for example, [19,20,4,14]) and, nevertheless, continue to be refined [21]. In Fe-Al alloys up to 50 at.% Al, no other phases except A2, D0 3 and B2 were detected [15], including when they were heated right up to melting.…”

Section: Discussionmentioning

confidence: 99%

Structures and phase transitions in Fe-Ga-Al alloys

Балагуров

Бобриков

Sumnikov

et al. 2022

Physics of the Solid State

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Evolution of structural phases and microstructural cast state of Fe100-(x+y)GaxAly compositions in the range of 17≤(x+y)≤39 at.% was studied in neutron diffraction experiments performed with high resolution and in continuous temperature scanning mode when heated to ~ 900oC and subsequent cooling. It is established that the structures of the cast states of triple alloys in the studied range of Ga and Al content basically repeat the structure of the double compositions Fe100-xGax up to x~ 30 and Fe100-yAly up to y~ 50. Namely, only cubic phases (A2, D03 and B2) are observed in them, and hexagonal (A3, D019) and monoclinic (such as Fe13Ga9 or α-Fe6Ga5) there are no phases characteristic of the Fe-Ga system. The expansion of the range of formation of cubic phases formed on the basis of the BCC cell in ternary alloys in comparison with Fe100-xGax indicates the role of Al in the stabilization of these structures. Keywords: alloys Fe-Ga, Fe-Al, Fe-Ga-Al, structural phase transitions, neutron diffraction, magnetostriction.

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Section: Discussionmentioning

confidence: 99%

Structures and phase transitions in Fe-Ga-Al alloys

Балагуров

Бобриков

Sumnikov

et al. 2022

Physics of the Solid State

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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%

“…For the alloys from 25.5 to 28.1%Ga and temperature range from ~480 to ~600 °C, the L1 2 phase is the only phase existing in this range, i.e., the D0 3 → L1 2 phase transition is 100% completed. These results gave us a background to correct low temperature range of the Fe–Ga phase diagram [ 16 , 17 ].…”

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

confidence: 99%

“…Fe–Ga alloys are also known for their ordering of Ga atoms in fcc (A1), bcc (A2), and hcp (A3) iron: the type of order depends on temperature range and %Ga atoms. Most recently, the equilibrium Fe–Ga phase diagram proposed by T. Gödecke and W. Köster [ 14 ] and adopted by O. Kubaschewski [ 15 ] was corrected in the temperature range below 600 °C to extend the range of the L1 2 phase [ 16 , 17 ].…”

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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“…Структурные фазовые диаграммы (и равновесная, и метастабильная) двойных сплавов хорошо известны и подробно описаны (см., напр. [19,20,4,14]) и, тем не менее, продолжают уточняться [21]. В сплавах Fe-Al вплоть до 50 аt.% Al никаких других фаз, кроме А2, D0 3 и B2, не обнаружено [15], в том числе, и при их нагревах вплоть до плавления.…”

Section: обсуждение и выводыunclassified

Структуры и фазовые переходы в Fe-Ga-Al сплавах

Балагуров¹,

Бобриков²,

Сумников³

et al. 2022

Физика Твердого Тела

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Эволюция структурных фаз и микроструктурного литого состояния составов Fe100-(x+y)GaxAly в диапазоне 17≤(x+y)≤39 at.% изучена в нейтронных дифракционных экспериментах, выполненных с высоким разрешением и в режиме непрерывного сканирования по температуре при нагреве до ~ 900oС и последующем охлаждении. Установлено, что структуры литых состояний тройных сплавов в изученном диапазоне содержания Ga и Al в основных чертах повторяют структуру двойных составов Fe100-xGax до x~ 30 и Fe100-yAly до y~ 50. А именно, в них наблюдаются только кубические фазы (А2, D03 и B2), а гексагональные (A3, D019) и моноклинные (типа Fe13Ga9 или α-Fe6Ga5) фазы, характерные для системы Fe-Ga, отсутствуют. Расширение диапазона образования кубических фаз, образующихся на основе ОЦК-ячейки, в тройных сплавах по сравнению с Fe100-xGax, свидетельствует о роли Al в стабилизации этих структур. Ключевые слова: сплавы Fe-Ga, Fe-Al, Fe-Ga-Al, структурные фазовые переходы, дифракция нейтронов, магнитострикция.

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Low-temperature metastable-to-equilibrium phase transitions in Fe–Ga alloys

Cited by 8 publications

References 32 publications

Structures and phase transitions in Fe-Ga-Al alloys

Structures and phase transitions in Fe-Ga-Al alloys

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

Структуры и фазовые переходы в Fe-Ga-Al сплавах

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