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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Obrabotka Metallov / Metal Working and Material Science</journal-id><journal-title-group><journal-title xml:lang="en">Obrabotka Metallov / Metal Working and Material Science</journal-title><trans-title-group xml:lang="ru"><trans-title>Обработка металлов (технология • оборудование • инструменты)</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1994-6309</issn><issn publication-format="electronic">2541-819X</issn><publisher><publisher-name xml:lang="en">Новосибирский государственный технический университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">308846</article-id><article-id pub-id-type="doi">10.17212/1994-6309-2025-27.3-137-150</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Effect of heat treatment on the structure and properties of high-entropy alloy AlCoCrFeNiNb0.25</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние термической обработки на строение и свойства высокоэнтропийного сплава AlCoCrFeNiNb0.25</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3040-8851</contrib-id><contrib-id contrib-id-type="scopus">56433301500</contrib-id><contrib-id contrib-id-type="researcherid">A-4999-2014</contrib-id><contrib-id contrib-id-type="spin">2942-3092</contrib-id><name-alternatives><name xml:lang="en"><surname>Kovalevskaya</surname><given-names>Zhanna G.</given-names></name><name xml:lang="ru"><surname>Ковалевская</surname><given-names>Жанна Геннадьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>D.Sc. (Engineering), Associate Professor</p></bio><bio xml:lang="ru"><p>доктор техн. наук, доцент</p></bio><email>kovalevskaya@tpu.ru</email><uri>https://portal.tpu.ru/SHARED/k/KOVALEVSKAYA</uri><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0002-8501-2643</contrib-id><name-alternatives><name xml:lang="en"><surname>Liu</surname><given-names>Y.</given-names></name><name xml:lang="ru"><surname>Лю</surname><given-names>Юаньсюнь</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Ph.D. (Engineering) student</p></bio><bio xml:lang="ru"><p>Аспирант</p></bio><email>yuansyun1@tpu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">National Research Tomsk Polytechnic University</institution></aff><aff><institution xml:lang="ru">Национальный исследовательский Томский политехнический университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-09-15" publication-format="electronic"><day>15</day><month>09</month><year>2025</year></pub-date><volume>27</volume><issue>3</issue><issue-title xml:lang="en">VOL 27, NO3 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 27, №3 (2025)</issue-title><fpage>137</fpage><lpage>150</lpage><history><date date-type="received" iso-8601-date="2025-09-10"><day>10</day><month>09</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Kovalevskaya Z.G., Liu Y.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Ковалевская Ж.Г., Лю Ю.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Kovalevskaya Z.G., Liu Y.</copyright-holder><copyright-holder xml:lang="ru">Ковалевская Ж.Г., Лю Ю.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rcsi.science/1994-6309/article/view/308846">https://journals.rcsi.science/1994-6309/article/view/308846</self-uri><abstract xml:lang="en"><p><bold>Introduction.</bold> Currently, one of the most studied high-entropy alloys (HEAs) is the CoCrFeNi system with the addition of a fifth component. An example of such an alloy is AlCoCrFeNi alloyed with additional elements. Nb alloying promotes the formation of a solid solution and a secondary Laves phase in the alloy, and leads to the formation of eutectics between these phases. The optimal combination of mechanical properties achieved in the hypoeutectic alloy AlCoCrFeNiNb0.25 was the basis for the choice of this alloy for further studies under heat treatment conditions. Purpose of the work. To investigate the effect of heat treatment, including heating to temperatures of 900°C, 1,000°C and 1,100°C with subsequent cooling in air, on the structure and properties of AlCoCrFeNiNb0.25. <bold>The methods of investigation</bold> were optical metallography, X-ray diffraction analysis, microhardness measurement, and compression tests. <bold>Results and Discussion.</bold> AlCoCrFeNiNb0.25 alloy retains the solid solution structure based on the BCC phase not only in the cast state, but also after heat treatment. Irrespective of heat treatment parameters, the alloy retains the hypoeutectic structure consisting of solid solution dendrites and eutectic with the Laves phase in the interdendritic space. Heat treatment leads to changes in the phase composition of the alloy and refinement of structural components. When heated to 900°C, along with the existing solid solution and Laves phase, σ-phase is released in the structure, which increases the microhardness of the alloy, but does not provide improvement of strength properties due to its low plasticity. The strength properties of the alloy are significantly improved by heat treatment with heating up to 1,000°C and 1,100°C. Heating up to 1,100°C is accompanied by an increase in residual strain. The main reasons for this effect may be transformations occurring both in the solid solution of the BCC phase (dissolution of the B2 phase, rearrangement of the substructure, increase in the lattice parameter) and in the eutectic (increase in the proportion of the Laves phase, refinement of eutectic cells).</p></abstract><trans-abstract xml:lang="ru"><p><bold>Введение.</bold> В настоящее время одним из наиболее изучаемых высокоэнтропийных сплавов (ВЭС) является система CoCrFeNi с добавлением пятого компонента. Примером такого сплава служит AlCoCrFeNi, легированный дополнительными элементами. Легирование Nb способствует образованию в сплаве твердого раствора и вторичной фазы Лавеса, а также приводит к образованию эвтектики между этими фазами. Оптимальное сочетание механических свойств, достигаемое в сплаве доэвтектического состава AlCoCrFeNiNb0.25, стало основанием выбора данного сплава для последующих исследований в условиях термообработки. <bold>Цель работы:</bold> исследование влияния термической обработки, включающей нагрев до температур 900, 1000 и 1100 °C с последующим охлаждением на воздухе, на структуру и свойства ВЭС AlCoCrFeNiNb0.25. <bold>Методы исследования:</bold> оптическая металлография, рентгеноструктурный анализ, измерение микротвердости и испытания на сжатие. <bold>Результаты и обсуждение.</bold> Сплав AlCoCrFeNiNb0.25 сохраняет структуру твердого раствора на основе ОЦК-фазы не только в литом состоянии, но и после термообработки. Независимо от режимов термообработки в сплаве сохраняется доэвтектическая структура, состоящая из дендритов твердого раствора и эвтектики с фазой Лавеса в междендритном пространстве. Термообработка приводит к изменению фазового состава сплава и совершенствованию структурных составляющих. При нагреве до 900 °C наряду с существующими твердым раствором и фазой Лавеса в структуре выделяется σ-фаза, повышающая микротвердость сплава, однако не обеспечивающая улучшение прочностных свойств в связи со своими низкими пластическими характеристиками. Прочностные характеристики сплава существенно улучшаются при термообработке с нагревом до 1000 и 1100 °С. Нагрев до 1100 °С сопровождается увеличением остаточной деформации. Основными причинами подобного эффекта могут быть превращения, происходящие как в твердом растворе ОЦК-фазы (растворение В2-фазы, перестройка субструктуры, увеличение параметра решетки), так и в эвтектике (увеличение доли фазы Лавеса, совершенствование эвтектических ячеек).</p></trans-abstract><kwd-group xml:lang="en"><kwd>AlCoCrFeNiNb0.25</kwd><kwd>High-Entropy Alloy</kwd><kwd>AlCoCrFeNiNb0.25</kwd><kwd>Heat Treatment</kwd><kwd>Microstructure</kwd><kwd>Microhardness</kwd><kwd>Compression Tests</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Высокоэнтропийный сплав</kwd><kwd>термическая обработка</kwd><kwd>микроструктура</kwd><kwd>микротвердость</kwd><kwd>испытания на сжатие</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Nanostructured high-entropy alloys with multiple principal elements: novel alloy design concepts and outcomes / J.W. Yeh, S.K. Chen, S.J. Lin, J.Y. Gan, T.S. Chin, T.T. Shun, C.H. 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