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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">blackmet</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Черная Металлургия</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya. Ferrous Metallurgy</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0368-0797</issn><issn pub-type="epub">2410-2091</issn><publisher><publisher-name>National University of Science and Technology "MISIS"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/0368-0797-2025-5-517-525</article-id><article-id custom-type="elpub" pub-id-type="custom">blackmet-2971</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКО-ХИМИЧЕСКИЕ ОСНОВЫ МЕТАЛЛУРГИЧЕСКИХ ПРОЦЕССОВ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICO-CHEMICAL BASICS OF METALLURGICAL PROCESSES</subject></subj-group></article-categories><title-group><article-title>Вязкость жидких сплавов кобальта с кремнием и бором: эксперимент и расчет</article-title><trans-title-group xml:lang="en"><trans-title>Viscosity of liquid alloys of cobalt with silicon and boron: Experiment and calculation</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5344-4815</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Олянина</surname><given-names>Н. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Olyanina</surname><given-names>N. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Наталья Владимировна Олянина, к.ф.-м.н., научный сотрудник</p><p>Россия, 426067, Удмуртская Республика, Ижевск, ул. им. Татьяны Барамзиной, 34</p></bio><bio xml:lang="en"><p>Natalia V. Olyanina, Cand. Sci. (Phys.–Math.), Research Associate</p><p>34 Tatyana Baramzina Str., Izhevsk, Udmurtian Republic 426067, Russian Federation</p></bio><email xlink:type="simple">oljanina@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5764-454X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бельтюков</surname><given-names>А. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Beltyukov</surname><given-names>A. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Анатолий Леонидович Бельтюков, к.ф.-м.н., ведущий научный сотрудник</p><p>Россия, 426067, Удмуртская Республика, Ижевск, ул. им. Татьяны Барамзиной, 34</p></bio><bio xml:lang="en"><p>Anatoly L. Beltyukov, Cand. Sci. (Phys.–Math.), Leading Researcher</p><p>34 Tatyana Baramzina Str., Izhevsk, Udmurtian Republic 426067, Russian Federation</p></bio><email xlink:type="simple">albeltyukov@udman.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7751-1007</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ладьянов</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Ladyanov</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Владимир Иванович Ладьянов, д.ф.-м.н., главный научный сотрудник, руководитель научного центра металлургической физики и материаловедения</p><p>Россия, 426067, Удмуртская Республика, Ижевск, ул. им. Татьяны Барамзиной, 34</p></bio><bio xml:lang="en"><p>Vladimir I. Ladyanov, Dr. Sci. (Phys.–Math.), Chief Researcher, Head of Scientific Center for Metallurgical Physics and Materials Science</p><p>34 Tatyana Baramzina Str., Izhevsk, Udmurtian Republic 426067, Russian Federation</p></bio><email xlink:type="simple">vilad@udman.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Удмуртский федеральный исследовательский центр Уральского отделения РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>08</day><month>11</month><year>2025</year></pub-date><volume>68</volume><issue>5</issue><fpage>517</fpage><lpage>525</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Олянина Н.В., Бельтюков А.Л., Ладьянов В.И., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Олянина Н.В., Бельтюков А.Л., Ладьянов В.И.</copyright-holder><copyright-holder xml:lang="en">Olyanina N.V., Beltyukov A.L., Ladyanov V.I.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://fermet.misis.ru/jour/article/view/2971">https://fermet.misis.ru/jour/article/view/2971</self-uri><abstract><p>Методом крутильных колебаний проведены исследования температурных (до 1700 °С) и концентрационных зависимостей вязкости жидких бинарных сплавов кобальта с кремнием и бором. Температурные зависимости вязкости жидкого кобальта и его расплавов с кремнием и бором (до 54 ат. % металлоида) имеют монотонный характер без каких-либо особенностей и хорошо описываются уравнением Аррениуса. Совпадение политерм вязкости, полученных в режиме нагрева и охлаждения, а также линейная зависимость логарифма вязкости от обратной абсолютной температуры в переохлажденной области свидетельствуют о сохранении структуры жидкого сплава. Микронеоднородное строение расплавов Co – Si и Co – B (до 54 ат. % металлоида), связанное с образованием микрогруппировок на основе силицидов и боридов кобальта с более прочными внутренними связями, приводит к сложному виду концентрационных зависимостей их вязкости и энергии активации вязкого течения. В статье авторы обсуждают прогностические возможности уравнений Козлова-Романова-Петрова и Kaptay для описания концентрационных зависимостей вязкости жидких сплавов типа металл–металлоид. Рассмот­рены особенности, связанные с применением этих уравнений к системам, в которых один из компонентов сплава (в данном случае бор в системе Co – B) при температурах расчета находится в твердом состоянии. Показано, что корректным способом решения проблемы является использование значения вязкости жидкого бора при его температуре плавления в качестве входного параметра для расчета изотерм вязкости расплавов системы Co – B. Уравнения Козлова-Романова-Петрова и Kaptay отличаются только коэффициентами перед энтальпией смешения расплава, физический смысл которых обсуждается в работе. Уравнение Козлова-Романова-Петрова может быть рекомендовано для прогнозирования концентрационных зависимостей вязкости жидких сплавов кобальта с кремнием и бором.</p></abstract><trans-abstract xml:lang="en"><p>The temperature (up to 1700 °C) and concentration dependences of the viscosity of liquid binary alloys of cobalt with silicon and boron were studied using an oscillating-cup method. The viscosity polytherms of liquid cobalt and its melts with silicon and boron (up to 54 at. % of the metalloid) are monotonous character without any anomalies and are well described by the Arrhenius equation. Coincidence of the viscosity polytherms obtained in the heating and cooling modes and linear dependence of the viscosity logarithm on the inverse absolute temperature in the supercooled region indicate the preservation of the liquid alloy structure. Microheterogeneous structure of Co – Si and Co – B melts (up to 54 at. % metalloid), associated with the formation of microgroups based on silicides and borides of cobalt with stronger internal bonds, leads to a complex form of concent­ration dependences of their viscosity and activation energy of viscous flow. The prognostic capabilities of the Kozlov-Romanov-Petrov and Kaptay equations for describing the concentration dependences of the viscosity of liquid metal-metalloid alloys are discussed. Features associated with the application of these equations to the systems in which one of the alloy components (in this case, boron in the Co – B system) is in the solid state at the calculation temperatures are considered. It is shown that the correct way to solve the problem is to use the viscosity value of liquid boron at its melting point as an input parameter for calculating the viscosity isotherms of the Co – B melts. The Kozlov-Romanov-Petrov and Kaptay equations differ only in the coefficients before the melt mixing enthalpy, the physical meaning of which is discussed in the paper. The Kozlov-Romanov-Petrov equation can be recommended for predicting the concentration dependences of the viscosity of liquid alloys of cobalt with silicon and boron.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>расплав</kwd><kwd>система Co – B</kwd><kwd>система Co – Si</kwd><kwd>вязкость</kwd><kwd>температурная зависимость вязкости</kwd><kwd>концентрационная зависимость вязкости</kwd><kwd>уравнение Аррениуса</kwd><kwd>уравнение Козлова-Романова-Петрова</kwd><kwd>уравнение Kaptay</kwd></kwd-group><kwd-group xml:lang="en"><kwd>melt</kwd><kwd>Co – B system</kwd><kwd>Co – Si system</kwd><kwd>viscosity</kwd><kwd>temperature dependence of viscosity</kwd><kwd>concentration dependence of viscosity</kwd><kwd>Arrhenius equation</kwd><kwd>Kozlov-Romanov-Petrov equation</kwd><kwd>Kaptay equation</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Gruner S., Marczinke J., Hennet L., Hoyer W., Cuello G.J. 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