Effect of high magnetic field on phase and structural transformations in ferromagnetic alloys. Review

Milyutin, V. A.; Gervasyeva, I.V.

doi:10.22226/2410-3535-2018-1-59-65

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…Значительный вклад может внести, например, проведение отжига в сильном магнитном поле. Как показано, например, в [18,19]…”

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Texture formation under rolling and primary recrystallization in Fe86Ga14 alloy

Gervasyeva¹,

Milyutin²

2018

LoM

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Fe-Ga alloys possess the increased magnetostriction in comparison with the traditional magnetostrictive materials Fe-Co and Fe-Al and have a number of advantages over magnetostrictive materials based of rare earths elements. In literature, much attention is paid to composition Fe 81 Ga 19 , as this alloy possesses the greatest magnetostriction in one-phase area. Important condition for attainment of the best functional properties in this material is creation of certain crystallographic texture. However, the substantial difficulty at manufacture of samples and wares consists in a high brittleness of alloy at such content of gallium, for this reason the features of formation of crystallographic texture at deformation and recrystallization in this alloy are studied poorly. In this work, the attempt to study influence of various modes of rolling and annealing on structure and magnetic properties of Fe-Ga alloy with the smaller content of Ga is made. The structure and texture of primary recrystallization were studied by means of an electron back-scattering diffraction, besides field dependences of magnetization were measured. The amount of grains with the direction of easy magnetization in different samples was estimated by the value of magnetic induction at a defined value of magnetic field on a magnetization curve. The values of magnetostriction increased with increase of volume fraction of the components including the direction of easy magnetization of iron-gallium alloy. Absolute values of magnetostriction did not exceed 50 ppm that is at the level of values for traditional materials, but lower than for Fe 81 Ga 19. Plastic deformation by hot and, especially cold rolling causes great difficulties in connection with a high brittleness of alloy even with the lower value of gallium concentration. Therefore, it is necessary to find new methods of a plastic deformation of alloy or to add the chemical elements improving plastic properties of material.

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Section: заключениеunclassified

Texture formation under rolling and primary recrystallization in Fe86Ga14 alloy

Gervasyeva¹,

Milyutin²

2018

LoM

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Magnetic Transformations and Phase Diagrams

Laughlin

2019

Metall Mater Trans A

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When magnetic phases are included on phase diagrams some unfamiliar features appear. Most magnetic transformations are not first-order phase transformations and therefore their depictions on phase diagrams do not have to follow the well-known construction requirements such as those based on the Gibbs Equilibrium Phase Rule. In particular, the transformation from a paramagnetic to ferromagnetic phase should be designated differently than those of the more widely known first-order transformations. The transformation curve (Curie curve) does not display a two-phase equilibrium: rather it shows the limit of stability of the disordered (paramagnetic) phase. In this paper, various examples of phase diagrams which include such transformations will be presented and discussed. The role of externally applied magnetic fields will be presented based on fundamental thermodynamic principles and the role that applied magnetic fields play in changing the degrees of freedom of systems (alloys) will be discussed.

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