Short-range order in soft magnetic alloy Fe–9 at.% Ga and conditions of its thermal treatment

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Аннотация

The atomic structure of monocrystalline samples of soft magnetic alloy Fe–9 at% Ga (A2-phase area) subjected to various thermal processing: 1 – quenching to water from paramagnetic state, 2 – annealing in a ferromagnetic state, 3 – thermomagnetic treatment (TMT) and 4 – thermomechanical treatment (TMechT), was studied by the method of X-ray diffraction. In the diffractograms of all samples, after different thermal treatments, diffuse peaks are observed, which are a contribution from small type of randomly located clusters of B2 type. A separate B2 cluster consists of a pair of BCC-cells centered by Ga atoms. The pair axis is parallel to one of the axes of easy magnetization <100>. It is shown that the width of diffuse peaks measured during scanning along the axis [001] decreases and, therefore, the average size of B2 clusters along this axis increases depending on the processing in the sequence of 1–2–3–4. The results obtained indicate a restructuring of short range order under the influence of TMT and TMechT.

Толық мәтін

Рұқсат жабық

Авторлар туралы

Yu. Chernenkov

Konstantinov St. Petersburg Institute of Nuclear Physics, National Research Center Kurchatov Institute

Email: nershov@imp.uran.ru
Ресей, Gatchina, Leningrad oblast, 188300

N. Ershov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: nershov@imp.uran.ru
Ресей, Ekaterinburg, 620108

Yu. Gornostyrev

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: nershov@imp.uran.ru
Ресей, Ekaterinburg, 620108

V. Lukshina

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: nershov@imp.uran.ru
Ресей, Ekaterinburg, 620108

A. Timofeeva

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: nershov@imp.uran.ru
Ресей, Ekaterinburg, 620108

D. Shishkin

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University Named after the First President of Russia B.N. Yeltsin

Email: nershov@imp.uran.ru
Ресей, Ekaterinburg, 620108; Ekaterinburg, 620002

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2. Fig. 1. Field dependence of the tetragonal magnetostriction coefficient λ100 in single-crystal samples of Fe–9 at.% Ga alloy before (1) and after (2) quenching in water, after holding in the paramagnetic state (left) before (3) and after (4) TMT in a constant magnetic field applied across the [001] axis (right).

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3. Fig. 2. Diffraction patterns measured in θ–2θ scanning of the reciprocal space along the axis (from top to bottom) [00L], [HH0], and [HHH] of the Fe–9 at.% Ga alloy subjected to different heat treatments: 1 – quenching; 2 – annealing; 3 – TMT dc H ^ [001]; 4 – TMT ac H ^ [001]; 5 – TMechO T ^ [001]; 6 – TMT dc H ║ [001] and 7 – of the α-iron single crystal. The experimental error corresponds to the symbol size. The vertical lines show the positions of the TDS peak maximum and the calculated positions for the D03 reflections. The indices (002), (222), (110) and (220) mark the Bragg peaks from the bcc lattice.

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4. Fig. 3. Diffraction patterns measured with θ–2θ scanning of the reciprocal space along the [001] axis for Fe–Ga alloy samples subjected to different heat treatments: 1 – quenching; 2 – TMT dc H ║ [001]; 3 – TMexO T ^ [001]. The dashed lines show the contribution of the Bragg reflections (002) and (004). The broad peaks are the contributions of locally ordered B2-type clusters. The solid lines show the results of the least-squares decomposition of the diffraction patterns.

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5. Fig. 4. Diffraction patterns measured with θ–2θ scanning of the reciprocal space in the [HHH] direction of Fe–Ga alloy samples subjected to different heat treatments: 1 – quenching; 2 – TMT dc H ║ [001]; 3 – TMexO T ^ [001]. The dashed lines show the contribution of the Bragg reflection (222). The broad peaks are the contributions of locally ordered B2-type clusters. The solid lines show the results of the least-squares decomposition of the diffraction patterns.

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6. Fig. 5. Average size of B2-phase clusters and heat treatment conditions: Quenching – quenching after holding in a paramagnetic state; TMO-1 – TMO in a constant magnetic field applied perpendicular to the [001] axis; TMO-2 – TMO in an alternating field applied perpendicular to the [001] axis; TMO-3 – TMO in a constant field applied along the [001] axis; Annealing – annealing and cooling in a ferromagnetic state; TMechO – TMechO under the action of a compressive load applied perpendicular to the [001] axis.

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7. Fig. 6. Integral intensity Im×w (see Tables 1 and 2) of diffuse scattering peaks (contribution of B2 clusters) (001) and (111) depending on the heat treatment conditions.

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8. Fig. 7. Schematic arrangement of B2 clusters in projection onto the (010) plane. In the field of view, 9 clusters are parallel to the [100] axis, 11 clusters are parallel to the [010] axis, 12 clusters are parallel to the [001] axis.

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