Control of magnetoelastic properties of Fe−Ga alloys using thermomechanical treatment

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Аннотация

The effect of thermomechanical treatment (TMechT), which includes annealing and cooling of the alloy under the external compressive load along the direction <001>, to magnetostriction of the Fe−18 at.%Ga alloy, has been investigated. Field dependencies of the longitudinal λ100∥ and transverse λ100⊥ magnetostriction are measured after TMechT with compressing stresses of 0–8 MPa. It is shown that as a result of TMechT already with small compressive stresses ~1 MPa, a significant change in the magnetostrictive behavior of the monocrystalline alloy occurs. The longitudinal component of magnetostriction λ100∥ increases, and the transverse λ100⊥ (by module) is reduced, while the complete magnetostrition λs=λ100∥−λ100⊥ practically does not change. The maximum value of the saturation magnetostriction λ100∥  is observed after TMechT under stress of 2 MPa − about 280 ppm. After TMechT at higher stresses λ100∥  it is at the level of 200 ppm, and λ100⊥ decreases and reaches zero at 6 MPa. The observed effects of TMechO are explained by the directional ordering the Ga−Ga pairs in the BCC Fe−Ga alloy.

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Авторлар туралы

V. Kochurin

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

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

V. Lukshina

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

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

A. Timofeeva

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

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

D. Shishkin

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University

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

M. Matyunina

Chelyabinsk State University

Email: nershov@imp.uran.ru
Ресей, Chelyabinsk, 454001

N. Ershov

M.N. 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

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

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

Әдебиет тізімі

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2. Fig. 1. Field dependences of the magnetostriction coefficients (curves 1, 3) and (curves 2, 4) of the Fe–18 at.% Ga alloy sample in the initial state after annealing in vacuum (curves 1, 2) and after TMT at a stress of 1 MPa (curves 3, 4).

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3. Fig. 2. The same as in Fig. 1 for a sample after heat treatment without load (curves 1) and after TMT at compressive stresses of 1, 2, 3, 4, 6 and 8 MPa (curves 2, 3, 4, 5, 6 and 7, respectively).

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4. Fig. 3. The influence of the magnitude of compressive stress during TME on the average values ​​of magnetostriction coefficients in a longitudinal ( , curve 1) and transverse ( , curve 2) magnetic field of 2 kOe, as well as their range ( , curve 3).

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