Frontier Materials & TechnologiesFrontier Materials & TechnologiesFrontier Materials & Technologies2782-40392782-6074Togliatti State University12910.18323/2073-5073-2021-1-16-23ArticlesСтатьиStructural phase transformations during deformation Of Fe-Co-V alloys using the high-pressure torsion methodСтруктурно-фазовые превращения при деформации сплавов Fe-Co-V методом кручения под высоким давлениемhttps://orcid.org/0000-0003-4891-8681MuradimovaLyaisan F.МурадимоваЛяйсан Фанисовна
Russian Federation

postgraduate student

аспирант

https://orcid.org/0000-0002-3491-1326GlezerAleksandr M.ГлезерАлександр Маркович
Russian Federation

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

доктор физико-математических наук, профессор, ведущий научный сотрудник

a.glezer@mail.ruShirshikovStanislav O.ШиршиковСтанислав Олегович
Russian Federation

postgraduate student

аспирант

ShchetininIgor V.ЩетининИгорь Викторович
Russian Federation

PhD (Engineering), Associate Professor

кандидат технических наук, доцент

DyakonovDmitriy L.ДьяконовДмитрий Львович
Russian Federation

senior researcher

старший научный сотрудник

National University of Science and Technology MISIS, Moscow (Russia)Национальный исследовательский технологический университет «МИСиС», Москва (Россия)I.P. Bardin Central Research Institute of Ferrous Metallurgy, Moscow (Russia)Центральный научно-исследовательский институт черной металлургии им. И.П. Бардина, Москва (Россия)310320211162331032021https://vektornaukitech.ru/jour/article/view/129

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.

Сплавы Fe-Co относятся к классу магнитно-мягких материалов и обладают при комнатной температуре очень высоким значением намагниченности насыщения σ. В частности, сплав Fe-Co с эквиатомным соотношением компонентов имеет при комнатной температуре максимальное значение σ среди всех известных ферромагнитных материалов. К сожалению, уникальные магнитные свойства этих сплавов (особенно Fe-Co) трудно реализовать из-за их высокой хрупкости, которая обусловлена главным образом формированием в структуре дальнего атомного упорядочения по типу В2. Для повышения пластичности сплавы Fe-Co легируют ванадием, но при этом снижаются основные магнитные характеристики. В данной статье с помощью рентгеноструктурного анализа, просвечивающей электронной микроскопии и магнитометрии проанализировано влияние кручения под высоким давлением при температурах 77 и 295 К на структуру и фазовый состав магнитно-мягких сплавов (Fe-Co)100-xVx (x=0–6,0). В качестве основного структурного параметра до и после деформации анализировалась величина объемной доли γ-фазы в ОЦК магнитной матрице. Установлено, что пластическая деформация приводит к подавлению образования избыточной γ-фазы в сплавах, содержащих (3,0–6,0) % V. Показано, что исчезновение γ-фазы наблюдается по мере роста деформации методом кручения под высоким давлением сначала в сплавах с высоким содержанием ванадия и при деформационном воздействии при более высокой температуре (295 К). Сделано заключение, что обнаруженный эффект является следствием протекания мартенситного превращения γ→α, обусловленного деформацией, по аналогии с ТРИП-эффектом. Выявлено, что подавление парамагнитной γ-фазы ведет к заметному повышению удельной намагниченности насыщения.

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