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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="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Frontier Materials &amp; Technologies</journal-id><journal-title-group><journal-title xml:lang="en">Frontier Materials &amp; Technologies</journal-title><trans-title-group xml:lang="ru"><trans-title>Frontier Materials &amp; Technologies</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2782-4039</issn><issn publication-format="electronic">2782-6074</issn><publisher><publisher-name xml:lang="en">Togliatti State University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">810</article-id><article-id pub-id-type="doi">10.18323/2782-4039-2022-4-81-89</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></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Thermal stability and corrosion resistance of ultrafine-grained high-entropy Fe30Ni30Mn30Cr10 alloy</article-title><trans-title-group xml:lang="ru"><trans-title>Термическая стабильность и коррозионная стойкость ультрамелкозернистого высокоэнтропийного сплава Fe30Ni30Mn30Cr10</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7053-3131</contrib-id><name-alternatives><name xml:lang="en"><surname>Nesterov</surname><given-names>Konstantin M.</given-names></name><name xml:lang="ru"><surname>Нестеров</surname><given-names>Константин Михайлович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Physics and Mathematics), researcher of the Research Institute of Physics of Advanced Materials</p></bio><bio xml:lang="ru"><p>кандидат физико-математических наук, научный сотрудник НИИ физики перспективных материалов</p></bio><email>kmnesterov@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6670-1537</contrib-id><name-alternatives><name xml:lang="en"><surname>Farrakhov</surname><given-names>Ruzil G.</given-names></name><name xml:lang="ru"><surname>Фаррахов</surname><given-names>Рузиль Галиевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Engineering), Associate Professor, assistant professor of Chair of Electronic Engineering</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент, доцент кафедры электронной инженерии</p></bio><email>farrahov.rg@ugatu.su</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8483-6408</contrib-id><name-alternatives><name xml:lang="en"><surname>Aubakirova</surname><given-names>Veta R.</given-names></name><name xml:lang="ru"><surname>Аубакирова</surname><given-names>Вета Робертовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Engineering), senior lecturer of Chair of Electronic Engineering</p></bio><bio xml:lang="ru"><p>кандидат технических наук, старший преподаватель кафедры электронной инженерии </p></bio><email>veta_mr@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6234-7363</contrib-id><name-alternatives><name xml:lang="en"><surname>Islamgaliev</surname><given-names>Rinat K.</given-names></name><name xml:lang="ru"><surname>Исламгалиев</surname><given-names>Ринат Кадыханович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Doctor of Sciences (Physics and Mathematics), Professor, Professor of Chair of Materials Science and Physics of Metals</p></bio><bio xml:lang="ru"><p>доктор физико-математических наук, профессор, профессор кафедры материаловедения и физики металлов</p></bio><email>rinatis@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3841-2169</contrib-id><name-alternatives><name xml:lang="en"><surname>Sirazeeva</surname><given-names>Arina R.</given-names></name><name xml:lang="ru"><surname>Сиразеева</surname><given-names>Арина Ренадовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>student</p></bio><bio xml:lang="ru"><p>студент</p></bio><email>sirazeeva.arina@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0319-0992</contrib-id><name-alternatives><name xml:lang="en"><surname>Abuayyash</surname><given-names>Adkham</given-names></name><name xml:lang="ru"><surname>Абуайяш</surname><given-names>Адхам</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>postgraduate student</p></bio><bio xml:lang="ru"><p>аспирант</p></bio><email>adhamabuayash4@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Ufa University of Science and Technology, Ufa</institution></aff><aff><institution xml:lang="ru">Уфимский университет науки и технологий, Уфа</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2022-12-30" publication-format="electronic"><day>30</day><month>12</month><year>2022</year></pub-date><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>81</fpage><lpage>89</lpage><history><date date-type="received" iso-8601-date="2022-12-30"><day>30</day><month>12</month><year>2022</year></date></history><permissions><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://vektornaukitech.ru/jour/article/view/810">https://vektornaukitech.ru/jour/article/view/810</self-uri><abstract xml:lang="en"><p>One of the promising research areas developing in recent times in the materials science is the development and research of high-entropy alloys containing several metal elements with the concentration close to equiatomic. The interest to them is generated by the fact that such alloys demonstrate the improved mechanical and functional properties. Another promising area improving strength of metallic materials is grain refinement using the severe plastic deformation methods. This work uses both approaches to form an ultrafine-grained (UFG) structure in the high-entropy Fe<sub>30</sub>Ni<sub>30</sub>Mn<sub>30</sub>Cr<sub>10</sub> alloy. The paper presents the structure, strength, thermal stability, and corrosion resistance of a high-entropy alloy subjected to the high pressure torsion (HPT). The study of the structure carried out by scanning electron microscopy showed that the application of the HPT deformation leads to the formation of an UFG structure with an average grain diameter less than 200 nm depending on temperature of HPT processing. Microhardness measuring and tensile tests at room temperature showed that after grain refinement, an increase in microhardness and ultimate tensile strength occurs in a high-entropy alloy, which is more than three times higher compared to the initial coarse-grained sample. At the same time, the UFG samples of a high-entropy alloy manifested thermal stability of microhardness after annealing up to temperature of 500 °С. The electrochemical tests carried out in an aqueous solution of 3.5 % NaCl at the temperature of 37 °С demonstrated a high corrosion resistance of the UFG high-entropy alloy.</p></abstract><trans-abstract xml:lang="ru"><p>Одним из перспективных научных направлений, активно развивающихся в последнее время в материаловедении, является разработка и исследование высокоэнтропийных сплавов, содержащих несколько металлических элементов с концентрацией, близкой к эквиатомной. Интерес к ним вызван тем, что они способны демонстрировать повышенные механические и функциональные свойства. Вместе с тем другим перспективным направлением повышения прочностных свойств металлических материалов является измельчение их зеренной структуры методами интенсивной пластической деформации. В настоящей работе оба этих подхода были использованы для формирования ультрамелкозернистой (УМЗ) структуры в высокоэнтропийном сплаве Fe<sub>30</sub>Ni<sub>30</sub>Mn<sub>30</sub>Cr<sub>10</sub>. Представлены результаты исследования структуры, прочности, термической стабильности и коррозионной стойкости высокоэнтропийного сплава, подвергнутого интенсивной пластической деформации кручением (ИПДК). Исследования структуры, проведенные методом просвечивающей электронной микроскопии, показали, что применение ИПДК ведет к формированию УМЗ структуры со средним размером зерен менее 200 нм в зависимости от температуры обработки. В результате измерений микротвердости и механических испытаний на растяжение при комнатной температуре обнаружено, что после сильного измельчения зеренной структуры в высокоэнтропийном сплаве происходит повышение микротвердости и предела прочности более чем в 3 раза по сравнению с исходным крупнозернистым состоянием. При этом УМЗ образцы высокоэнтропийного сплава проявили термическую стабильность микротвердости после отжигов до температуры 500 °С. Электрохимические испытания, проведенные в водном растворе 3,5 % NaCl при температуре 37 °С, продемонстрировали высокую коррозионную стойкость УМЗ образцов высокоэнтропийного сплава.</p></trans-abstract><kwd-group xml:lang="en"><kwd>thermal stability</kwd><kwd>heat treatment</kwd><kwd>corrosion resistance</kwd><kwd>high-entropy alloy</kwd><kwd>high pressure torsion deformation (HPT)</kwd><kwd>corrosion tests</kwd><kwd>polarization curve</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>термостабильность</kwd><kwd>термообработка</kwd><kwd>коррозионная стойкость</kwd><kwd>высокоэнтропийный сплав</kwd><kwd>интенсивная пластическая деформация кручением</kwd><kwd>коррозионные испытания</kwd><kwd>поляризационная кривая</kwd></kwd-group><funding-group><funding-statement xml:lang="en">R.K. Islamgaliev and K.M. Nesterov express their gratitude to the Russian Science Foundation for its financial support within the project No. 22-23-00714.</funding-statement><funding-statement xml:lang="ru">Р.К. 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