blackmetИзвестия высших учебных заведений. Черная МеталлургияIzvestiya. Ferrous Metallurgy0368-07972410-2091National University of Science and Technology "MISIS"10.17073/0368-0797-2024-2-176-184blackmet-2708Research ArticleМАТЕРИАЛОВЕДЕНИЕMATERIAL SCIENCEЭволюция дислокационной структуры и фазового состава в процессе нагрева деформированного высокоэнтропийного сплава Al0,3CoCrFeNiEvolution of dislocation structure and phase composition of deformed Al0.3CoCrFeNi high-entropy alloy during heatinghttps://orcid.org/0000-0001-5021-0098ИвановИ. В.IvanovI. V.

Иван Владимирович Иванов, к.т.н., научный сотрудник научно-исследовательской лаборатории физико-химических технологий и функциональных материалов

Россия, 630073, Новосибирск, пр. Карла Маркса, 20

Ivan V. Ivanov, Cand. Sci. (Eng.), Research Associate of the Research Labo­ratory of Physical and Chemical Technologies and Functional Materials

20 K. Marksa Ave., Novosibirsk 630073, Russian Federation

i.ivanov@corp.nstu.ruhttps://orcid.org/0000-0002-2078-4194АккузинС. А.AkkuzinS. A.

Сергей Александрович Аккузин, младший научный сотрудник лаборатории материаловедения сплавов с памятью формы

Россия, 634055, Томск, пр. Академи­ческий, 2/4

Sergei A. Akkuzin, Junior Researcher of the Laboratory of Materials Science of Shape Memory Alloys

2/4 Akademiches­kii Ave., Tomsk 634055, Russian Federation

s.akkuzin@ispms.ruhttps://orcid.org/0000-0002-2811-8292СафароваД. Э.SafarovaD. E.

Дарья Эйнуллаевна Сафарова, магистрант кафедры материаловедения в машиностроении

Россия, 630073, Новосибирск, пр. Карла Маркса, 20

Dar’ya E. Safarova, MA Student of the Chair “Materials Science in Mechanical Engineering”

20 K. Marksa Ave., Novosibirsk 630073, Russian Federation

safarova10ab@mail.ruhttps://orcid.org/0000-0002-5892-3719ЛитовченкоИ. Ю.LitovchenkoI. Yu.

Игорь Юрьевич Литовченко, д.ф.-м.н., доцент, заведующий лабораторией материаловедения сплавов с памятью формы

Россия, 634055, Томск, пр. Академи­ческий, 2/4

Igor’ Y. Litovchenko, Dr. Sci. (Phys.-Math.), Assist. Prof., Head of the Laboratory of Materials Science of Shape Memory Alloys

2/4 Akademiches­kii Ave., Tomsk 634055, Russian Federation

litovchenko@ispms.ruhttps://orcid.org/0000-0003-2871-0269БатаевИ. А.BataevI. A.

Иван Анатольевич Батаев, д.т.н., доцент, заведующий научно-исследовательской лабораторией физико-химических технологий и функциональных материалов

Россия, 630073, Новосибирск, пр. Карла Маркса, 20

Ivan A. Bataev, Dr. Sci. (Eng.), Assist. Prof., Head of the Research Laboratory of Physical and Chemical Technologies and Functional Materials

20 K. Marksa Ave., Novosibirsk 630073, Russian Federation

i.bataev@corp.nstu.ruНовосибирский государственный технический университетРоссияNovosibirsk State Technical UniversityRussian FederationИнститут физики прочности и материаловедения Сибирского отделения РАНРоссияInstitute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of SciencesRussian Federation202420042024672176184Copyright © Иванов И.В., Аккузин С.А., Сафарова Д.Э., Литовченко И.Ю., Батаев И.А., 20242024Иванов И.В., Аккузин С.А., Сафарова Д.Э., Литовченко И.Ю., Батаев И.А.Ivanov I.V., Akkuzin S.A., Safarova D.E., Litovchenko I.Y., Bataev I.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://fermet.misis.ru/jour/article/view/2708

При выборе составов высокоэнтропийных сплавов одним из учитываемых параметров является термическая стабильность. В работе рассматриваются структурные преобразования деформированного высокоэнтропийного сплава Al0,3CoCrFeNi, происходящие в процессе его отжига. Материал получен методом аргонодуговой плавки смеси чистых одноэлементных компонентов. С целью гомогенизации структуры полученный слиток подвергался термомеханической обработке по схеме, сочетающей холодную прокатку со степенью обжатия 50 % и низкотемпературный отжиг (400 °C в течение 100 ч). В дальнейшем гомогенизированная заготовка прокатывалась в холодном состоянии со степенью обжатия 80 %. Структуру материалов исследовали непосредственно в процессе нагрева (в режиме in-situ) с использованием метода дифракции синхротронного рентгеновского излучения. Скорость нагрева образцов составляла 20 °C/мин, максимальная температура нагрева – 1000 °C. Параметры дислокационной структуры сплава (плотность винтовых дислокаций, пространственное распределение дислокаций) в процессе нагрева определяли с использованием модифицированных методов Вильямсона–Холла и Уоррена–Авербаха. Согласно полученным данным, температура начала формирования высокоэнтропийной фазы, обладающей примитивной кубической решеткой, составляет 560 °C. В процессе нагрева материала вплоть до температуры начала формирования этой фазы наблюдаются увеличение плотности винтовых дислокаций и формирование разупорядоченной дислокационной структуры. Характер изменения плотности дислокаций хорошо коррелирует с ростом микротвердости сплава. При начальном значении в 406 ± 13 HV0,1 (для деформированного материала) микротвердость в процессе термической обработки повышается до 587 ± 10 HV0,1.

When choosing compositions of high-entropy alloys, one of the parameters taken into account is thermal stability. The paper considers the structural transformations of the deformed Al0.3CoCrFeNi high-entropy alloy occurring during its annealing. The material was obtained by argon-arc melting with a mixture of pure single-element components. In order to homogenize the structure, the resulting ingot was subjected to thermomecha­nical processing according to a scheme combining cold rolling with a compression ratio of 50 % and low-temperature annealing (400 °C for 100 h). In the future, the homogenized billet was rolled in a cold state with a compression ratio of 80 %. The structure of the materials was studied directly during heating (in-situ mode) using the method of synchrotron X-ray diffraction. The heating rate of the samples was 20 °C/min, the maximum heating temperature was 1000 °C. The parameters of the alloy dislocation structure (density of screw dislocations, spatial distribution of dislocations) during heating were determined using the modified Williamson–Hall and Warren–Averbach methods. According to the data obtained, the temperature of beginning of formation of a high-entropy phase with a primitive cubic lattice is 560 °C. In the process of heating the material up to this temperature, an increase in density of screw dislocations and formation of a disordered dislocation structure are observed. The nature of change in dislocation density correlates well with the increase in the alloy microhardness. At an initial value of 406 ± 13 HV0.1 (for the deformed material), the microhardness during heat treatment increases up to 587 ± 10 HV0.1 .

высокоэнтропийные сплавысплав Al03CoCrFeNiпластическая деформациятермическая обработкадислокационная структурапросвечивающая электронная микроскопиядифракция синхротронного рентгеновского излученияhigh-entropy alloyAl0.3CoCrFeNiplastic deformationheat treatmentdislocation structuretransmission electron microscopysynchrotron X-ray diffractionИсследование выполнено при финансовой поддержке Российского Научного Фонда в рамках проекта № 20-73-10215 «In-situ исследование эволюции дислокационной структуры пластически деформированных высокоэнтропийных сплавов в условиях действия высоких давлений и температур с применением синхротронного излучения».The work was supported by the Russian Science Foundation, research project No. 20-73-10215 “In-situ study of evolution of dislocation structure of plastically deformed high-entropy alloys under high-pressures and temperatures using synchrotron radiation”.ReferencesThirathipviwat P., Song G., Jayaraj J., Bednarcik J., Wendrock H., Gemming T., Freudenberger J., Nielsch K., Han J. 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The authors declare that there are no conflicts of interest present.