X-ray diffraction studies of specific features in the atomic structure of Fe-Si alloys in the α area of the phase diagram

Ershov, N. V.; Chernenkov, Yu. P.; Lukshina, V. A.; Fedorov, V. I.

doi:10.1134/s1063783409030019

Cited by 18 publications

(11 citation statements)

References 6 publications

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“…Equilibrium phase diagrams 25 of both Fe-Si and Fe-Ge show a phase boundary near e/a $1.35, however, the peak in the magnetostriction for Fe-Si occurs at a lower e/a. Structural studies [32][33][34] show that Fe-Si exhibits the B2 and D0 3 short range order at fairly low Si concentrations. Perhaps the Si atom's smaller size, compared with the other solute atoms, catalyzes short range order B2 and D0 3 formation more readily, inducing a decrease in k c,2 even before the phase transition occurs.…”

Section: Magnetostriction and Magnetoelastic Coupling Versus E/a Rmentioning

confidence: 99%

Tetragonal magnetostriction and magnetoelastic coupling in Fe-Al, Fe-Ga, Fe-Ge, Fe-Si, Fe-Ga-Al, and Fe-Ga-Ge alloys

Restorff

Wun‐Fogle

Hathaway

et al. 2012

Journal of Applied Physics

107

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This paper presents a comparative study on the tetragonal magnetostriction constant,λ γ,2 , [ = (3/2)λ 100 ] and magnetoelastic coupling, b 1 , of binary Fe 100-xZ x (0 < x < 35, Z = Al, Ga, Ge, and Si) and ternary Fe-Ga-Al and Fe-Ga-Ge alloys. The quantities are corrected for magnetostrains due to sample geometry (the magnetostrictive form effect). Recently published elastic constant data along with magnetization measurements at both room temperature and 77 K make these corrections possible. The form effect correction lowers the magnetostriction by ∼10 ppm for high-modulus alloys and by as much as 30 ppm for low-modulus alloys. The elastic constants are also used to determine the values of the magnetoelastic coupling constant, b 1 . With the new magnetostriction data on the Fe-Al-Ga alloy, it is possible to show how the double peak magnetostriction feature of the binary Fe-Ga alloy flows into the single peak binary Fe-Al alloy. The corrected magnetostriction and magnetoelastic coupling data for the various alloys are also compared using the electron-per-atom ratio, e/a, as the common variable. The Hume-Rothery rules link thee/a ratio to the regions of phase stability, which appear to be intimately related to the magnetostriction versus the solute concentration curve in these alloys. Using e/a as the abscissa tends to align the peaks in the magnetostriction and magnetoelastic coupling for the Fe-Ga, Fe-Ge, Fe-Al, Fe-Ga-Al, and Fe-Ga-Ge alloys, but not for the Fe-Si alloys for which the larger atomic size difference may play a greater role in phase stabilization. Corrections for the form effect are also presented for the rhombohedral magnetostriction,λ ɛ,2 , and the magnetoelastic coupling, b 2 , of Fe 100-x Ga x (0 < x < 35) alloys.Keywords aluminium alloys, elastic constants, elastic moduli, gallium alloys, germanium alloys, iron alloys, magnetisation, magnetoelastic effects, magnetostriction, silicon alloys Disciplines Condensed Matter Physics | Metallurgy CommentsThe following article is from Journal of Applied Physics 111 (2012) This paper presents a comparative study on the tetragonal magnetostriction constant, k c,2 , [ ¼ (3/2) k 100 ] and magnetoelastic coupling, b 1 , of binary Fe 100-x Z x (0 < x < 35, Z ¼ Al, Ga, Ge, and Si) and ternary Fe-Ga-Al and Fe-Ga-Ge alloys. The quantities are corrected for magnetostrains due to sample geometry (the magnetostrictive form effect). Recently published elastic constant data along with magnetization measurements at both room temperature and 77 K make these corrections possible. The form effect correction lowers the magnetostriction by $10 ppm for high-modulus alloys and by as much as 30 ppm for low-modulus alloys. The elastic constants are also used to determine the values of the magnetoelastic coupling constant, b 1 . With the new magnetostriction data on the Fe-Al-Ga alloy, it is possible to show how the double peak magnetostriction feature of the binary Fe-Ga alloy flows into the single peak binary Fe-Al alloy. The corrected magnetostriction and magnetoel...

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Section: Magnetostriction and Magnetoelastic Coupling Versus E/a Rmentioning

confidence: 99%

Tetragonal magnetostriction and magnetoelastic coupling in Fe-Al, Fe-Ga, Fe-Ge, Fe-Si, Fe-Ga-Al, and Fe-Ga-Ge alloys

Restorff

Wun‐Fogle

Hathaway

et al. 2012

Journal of Applied Physics

107

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“…По-видимому, после отжига отчасти остаются небольшие D0 3 -кластеры, присутствие которых однозначно определяется в зака-ленном образце. При этом необходимо отметить важный факт -в отличие от сплавов Fe−Al (7 at.% Al) [13] и Fe−Si (5−6 at.% Si) [10,11], в исследуемом Fe−Ga-сплаве B2-пики смещены не в меньшие, а в большие углы рассеяния от расчетных положений для (0 0 1) и (0 0 3), отмеченных вертикальными линиями на рис. 4.…”

Section: результаты и обсуждениеunclassified

“…Исследования локального упорядочения в сплавах железо-кремний показали [10][11][12], что в закаленных образцах сплава, содержащего 5−10 at.% Si, имеются кластеры с B2-упорядочением. При увеличении концентрации кремния от 5−6 до 8 at.% появляются небольшие области с D0 3 -порядком, размеры и объемная доля которых растет после 10 минутной выдержки при температуре 450 • C. При 10 at.% кремния D0 3 -фаза представляет собой области с дальним упорядочением [12].…”

Section: Introductionunclassified

Влияние отжига в ферромагнитном состоянии на структуру сплава железа с 18 at.% галлия

Черненков¹,

Ершов²,

Лукшина³

2018

Журнал Технической Физики

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Атомная структура образцов сплава железо-галлий, содержащего около 18 at.% галлия, исследовалась методом рентгеновской дифракции. Образцы отжигались в парамагнитном (T > T C) и в ферромагнитном (T < T C) состояниях. В первом случае структурное состояние фиксировалось закалкой от температуры отжига в воду, во втором-медленным охлаждением. Структурные исследования монокристаллических образцов проводились на четырехкружном рентгеновском дифрактометре при комнатной температуре. Из данных рентгеновской дифракции следует, что независимо от способа термообработки сплава в нем присутствуют B2-кластеры, локально упорядоченные области со структурой типа CsCl, ранее обнаруженные нами в сплавах железа с кремнием (до 10 at.% Si) и с алюминием (7 at.% Al). Кроме B2-кластеров, в закаленном образце наблюдаются области с D0 3-ближним порядком, размер которых после отжига в ферромагнитном состоянии значительно увеличивается, то есть возникает дальний порядок. Обсуждается связь тонких структурных изменений сплава при различных термообработках с его магнитоупругими и магнитострикционными свойствами. Работа выполнена в рамках государственного задания по теме " Магнит" № АААА-А18-118020290129-5 и проекту № 18-10-2-5 программы УрО РАН при поддержке РФФИ (грант № 18-02-00391).

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“…Our previous investigations carried out using X ray diffraction and Mössbauer spectroscopy have estab lished that the inhomogeneity is a characteristic fea ture of the solid solution consisting of 5-8 at % silicon in iron [22,23]. Even the samples of the alloy sub jected to severe plastic deformation under pressure are characterized by a local separation into regions.…”

Section: Introductionmentioning

confidence: 98%

Magnetic domain and local atomic structures of the Fe0.94Si0.06 alloy before and after thermomagnetic treatment in an alternating-current magnetic field

et al. 2012

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The changes observed in the local atomic structure of an iron alloy with 6 at % Si as a result of ther momagnetic treatment in an alternating current magnetic field and their correlation with magnetic charac teristics, such as the domain structure and magnetic properties, have been investigated using Mössbauer spec troscopy. It has been shown that the destabilization of the domain structure is caused by the destruction of uniaxial magnetic anisotropy in domains due to a disordered distribution of pairs of silicon atoms along the 〈100〉 easy magnetization axes. Annealing and cooling without an external magnetic field and in an alternat ing current magnetic field lead to a change in the magnetic texture of single crystal samples of the siliconiron alloy. When the samples are annealed in an alternating current magnetic field, the magnitude of this effect depends on the orientation of the magnetic field with respect to the crystallographic axes of the sample.

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X-ray diffraction studies of specific features in the atomic structure of Fe-Si alloys in the α area of the phase diagram

Cited by 18 publications

References 6 publications

Tetragonal magnetostriction and magnetoelastic coupling in Fe-Al, Fe-Ga, Fe-Ge, Fe-Si, Fe-Ga-Al, and Fe-Ga-Ge alloys

Tetragonal magnetostriction and magnetoelastic coupling in Fe-Al, Fe-Ga, Fe-Ge, Fe-Si, Fe-Ga-Al, and Fe-Ga-Ge alloys

Влияние отжига в ферромагнитном состоянии на структуру сплава железа с 18 at.% галлия

Magnetic domain and local atomic structures of the Fe0.94Si0.06 alloy before and after thermomagnetic treatment in an alternating-current magnetic field

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X-ray diffraction studies of specific features in the atomic structure of Fe-Si alloys in the α area of the phase diagram

Cited by 18 publications

References 6 publications

Tetragonal magnetostriction and magnetoelastic coupling in Fe-Al, Fe-Ga, Fe-Ge, Fe-Si, Fe-Ga-Al, and Fe-Ga-Ge alloys

Tetragonal magnetostriction and magnetoelastic coupling in Fe-Al, Fe-Ga, Fe-Ge, Fe-Si, Fe-Ga-Al, and Fe-Ga-Ge alloys

Влияние отжига в ферромагнитном состоянии на структуру сплава железа с 18 at.&#37; галлия

Magnetic domain and local atomic structures of the Fe0.94Si0.06 alloy before and after thermomagnetic treatment in an alternating-current magnetic field

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Влияние отжига в ферромагнитном состоянии на структуру сплава железа с 18 at.% галлия