Induced Uniaxial Magnetic Anisotropy of FeAl Alloys at Low Concentrations

Steinert, J.

doi:10.1002/pssb.19670210149

“…3. D, vanishes in pure iron and a t about 14 wty0 A1 because there is not any induced anisotropy [5]. Further D, shows Fig.…”

Section: Resultsmentioning

confidence: 90%

“…But a t these high temperatures the effect is not so large as a t temperatures below 370 "C because there is a stage of recovery of vacancies [5]. I n other quenched samples pA decreases irreversibly a t temperatures of about 250 "C. Such samples have more than 0.03 wtyo C and therefore we suppose that this behaviour is caused by carbon rich precipitations like cementite [ I I , 121.…”

Section: Resultsmentioning

confidence: 99%

Disaccommodation in Fe-Al alloys

Steinert¹

1970

Phys. Stat. Sol. (a)

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In Fe-A1 alloys only two regions of disaccommodation are found. The first at about 0°C is caused by the Snoek-effect and the second a t about 4 0 0°C by reorientation of substituted A1 atoms. The temperature dependence of the disaccommodation agrees well with the calculated one. Its magnitude shows a deep minimum a t about I1 wtyo A1 which is not yet unterstood. If the disaccommodation is caused by blocking of the walls due t o induced anisotropies the stabilization energy is inversely proportional t o the wall thickness.Bei 0 "C rufen Zwischengitteratome einen zeitlichen Abfall der PermeabilitLt auf Grund des Snoek-Effektes hervor, wahrend bei ca. 400 "C die Umorientierung von Komplexen, die aus Substitutionsatomen bestehen, eine Desakkommodation bedingt. Ihre Temperaturabhangigkeit stimmt gut mit dem berechneten Verlauf uberein. Bei 11 Gew% A1 wird nur eine sehr kleine Desakkommodation gefunden. Wird eine Desakkommodation durch die Ausbildung von induzierten Anisotropien hervorgerufen, dann ist die Stabilisierungsenergie der Wiinde umgekehrt proportional zu ihrer Dicke.In Fe-Al-Legierungen wurden zwei Desakkommodationsgebiete gefunden.

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“…Такие сплавы обладают магнитомягкими свойствами и характеризуются важными для их практического применения особенностями, которые связаны с их структурным состоянием. К ним относятся наведенная магнитная анизотропия, как эффект термомагнитной или термомеханической обработки [19][20][21][22][23], квадратичный рост коэффициента тетрагональной магнитострикции от концентрации [24,25] и необычное для большинства металлов и сплавов поведение электросопротивления от температуры, так называемое " K-состояние" [26,27]. Выше 25 at.% алюминия имеются области фаз α ′ и α ′′ со стехиометрией FeAl и Fe 3 Al и структурой B2 и D0 3 соответственно [28].…”

Section: Introductionunclassified

Ближний порядок в "неупорядоченных" твердых растворах алюминия в α-железе

Ершов¹,

Клейнерман²,

Лукшина³

et al. 2023

Физика Твердого Тела

0

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The atomic structure of soft magnetic iron-aluminum alloys is studied by X-ray diffraction and nuclear gamma-resonance spectroscopy. The concentration dependence of the body-centered cubic lattice constant and the short-range order (SRO) parameters in the region of a disordered solid solution is monitored. It is shown that in the concentration range from 3 to 18 at.% Al, the lattice constant increases almost linearly. Discrete decomposition of nuclear gamma resonance spectra makes it possible to determine such SRO parameters as the relative fractions of contributions from coordinations without Al atoms and with one, two, and three Al atoms in the first and second coordination shells. The deviation of the values of these fractions from the average statistical probabilities indicates the presence of a chemical order in the arrangement of atoms. The largest deviations are observed at 12 and 15 at.% Al. Conditions of preliminary heat treatment, such as quenching from the paramagnetic state and holding in the ferromagnetic state, give very similar values of the SRO parameters. The method is characterized by a high resolution in the hyperfine field, while having a rather high sensitivity for determining the intensity of individual contributions.

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“…Such alloys have soft magnetic properties and are characterized by features important for their practical application, which are associated with their structural state. These include induced magnetic anisotropy as an effect of thermomagnetic or thermomechanical treatment [19][20][21][22][23], a quadratic increase in the tetragonal magnetostriction coefficient with concentration [24,25] and behavior of electrical resistance versus temperature, unusual for most metals and alloys, the so-called " K-state" [26,27]. Above 25 at.% aluminum, there are regions of α ′ and α ′′ phases with FeAl and Fe 3 Al stoichiometry and B2 and D0 3 structures respectively [28].…”

Section: Introductionmentioning

confidence: 99%

Short-range order in "disordered" aluminum solid solutions in α-iron

Ershov

¹

,

Kleinerman

²

,

Lukshina

³

et al. 2023

Physics of the Solid State

2

0

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The atomic structure of soft magnetic iron-aluminum alloys is studied by X-ray diffraction and nuclear gamma-resonance spectroscopy. The concentration dependence of the body-centered cubic lattice constant and the short-range order (SRO) parameters in the region of a disordered solid solution is monitored. It is shown that in the concentration range from 3 to 18 at.% Al, the lattice constant increases almost linearly. Discrete decomposition of nuclear gamma resonance spectra makes it possible to determine such SRO parameters as the relative fractions of contributions from coordinations without Al atoms and with one, two, and three Al atoms in the first and second coordination shells. The deviation of the values of these fractions from the average statistical probabilities indicates the presence of a chemical order in the arrangement of atoms. The largest deviations are observed at 12 and 15 at.% Al. Conditions of preliminary heat treatment, such as quenching from the paramagnetic state and holding in the ferromagnetic state, give very similar values of the SRO parameters. The method is characterized by a high resolution in the hyperfine field, while having a rather high sensitivity for determining the intensity of individual contributions Keywords: soft magnetic alloys, disordered Fe-Al solid solution, local ordering, X-ray diffraction, Mossbauer effect, distribution of atoms over coordination shells.

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Induced Uniaxial Magnetic Anisotropy of FeAl Alloys at Low Concentrations

Cited by 11 publications

References 4 publications

Disaccommodation in Fe-Al alloys

Disaccommodation in Fe-Al alloys

Ближний порядок в "неупорядоченных" твердых растворах алюминия в α-железе

Short-range order in "disordered" aluminum solid solutions in α-iron

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Induced Uniaxial Magnetic Anisotropy of FeAl Alloys at Low Concentrations

Cited by 11 publications

References 4 publications

Disaccommodation in Fe-Al alloys

Disaccommodation in Fe-Al alloys

Ближний порядок в "неупорядоченных" твердых растворах алюминия в &alpha;-железе

Short-range order in &quot;disordered&quot; aluminum solid solutions in α-iron

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Ближний порядок в "неупорядоченных" твердых растворах алюминия в α-железе

Short-range order in "disordered" aluminum solid solutions in α-iron