Structural phase transformations during deformation Of Fe-Co-V alloys using the high-pressure torsion method


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Abstract

Fe-Co alloys belong to the soft magnetic materials and have an extremely high value of saturation magnetization σ at room temperature. In particular, Fe-Co alloy with the equiatomic ratio of components at room temperature has the maximal σ value among all known ferromagnetic materials. Unfortunately, it is hard to reproduce the unique magnetic properties of these alloys (especially Fe-Co alloys) due to their high fragility caused mainly by the formation of far atomic ordering according to B2 type in the structure. Adding vanadium to the Fe-Co alloys increases plasticity, but it reduces basic magnetic characteristics. In this paper, using the X-ray structural analysis, transmission scanning microscopy, and magnetometry, the authors analyzed the influence of high-pressure torsion at the temperatures of 77 and 295 K on the structure and phase composition of soft magnetic alloys (Fe-Co)100-xVx (x=0–6.0). As the principal structural parameter before and after deformation, the authors analyzed the magnitude of γ-phase volume ratio in the BCC magnetic matrix. The study identified that plastic deformation causes the suppression of formation of excessive γ-phase in alloys containing (3.0–6.0) % V. The study shows that the loss of γ-phase is observed with the increase of high-pressure torsion deformation firstly in the alloys with the high vanadium proportion and at the deformation effect at higher temperature (295 K). The authors conclude that the detected effect is a consequence of γ→α martensite transformation caused by deformation by analogy to TRIP-effect. The study identified that the suppression of paramagnetic γ-phase leads to a noticeable increase in the specific saturation magnetization.

About the authors

Lyaisan F. Muradimova

National University of Science and Technology MISIS, Moscow (Russia)

Email: fake@neicon.ru
ORCID iD: 0000-0003-4891-8681

postgraduate student

Россия

Aleksandr M. Glezer

National University of Science and Technology MISIS, Moscow (Russia)

Author for correspondence.
Email: a.glezer@mail.ru
ORCID iD: 0000-0002-3491-1326

Doctor of Sciences (Physics and Mathematics), Professor, leading researcher

Россия

Stanislav O. Shirshikov

National University of Science and Technology MISIS, Moscow (Russia)

Email: fake@neicon.ru

postgraduate student

Россия

Igor V. Shchetinin

National University of Science and Technology MISIS, Moscow (Russia)

Email: fake@neicon.ru

PhD (Engineering), Associate Professor

Россия

Dmitriy L. Dyakonov

I.P. Bardin Central Research Institute of Ferrous Metallurgy, Moscow (Russia)

Email: fake@neicon.ru

senior researcher

Россия

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