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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">cvmet</journal-id><journal-title-group><journal-title xml:lang="ru">Известия вузов. Цветная металлургия</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya. Non-Ferrous Metallurgy</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0021-3438</issn><issn pub-type="epub">2412-8783</issn><publisher><publisher-name>НИТУ МИСИС</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/0021-3438-2024-1-81-92</article-id><article-id custom-type="elpub" pub-id-type="custom">cvmet-1587</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>Металловедение и термическая обработка</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Physical Metallurgy and Heat Treatment</subject></subj-group></article-categories><title-group><article-title>Влияние РКУП при температуре 300 °С на структуру и свойства закаленного сплава Zr–2,5%Nb</article-title><trans-title-group xml:lang="en"><trans-title>Impact of ECAP at 300 °C on the microstructure and mechanical properties of the quenched Zr–2.5%Nb alloy</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5925-4513</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гундеров</surname><given-names>Д. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Gunderov</surname><given-names>D. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дмитрий Валерьевич Гундеров – д.ф.-м.н., вед. науч. сотрудник Института физики молекул и кристаллов (ИФМК) УФИЦ РАН, гл. науч. сотрудник</p><p>450076, Респ. Башкортостан, г. Уфа, ул. Заки Валиди, 32;</p><p>450054, Респ. Башкортостан, г. Уфа, пр-т Октября, 71</p></bio><bio xml:lang="en"><p>Dmitry V. Gunderov – Dr. Sci. (Phys.-Math.), Head Researcher of the Institute of Physics of Molecules and Crystals, Сhief Researcher</p><p>32 Zaki Validi Str., Ufa, Republic of Bashkortostan 450076;</p><p>71 Oktyabrya Prosp., Ufa, Republic of Bashkortostan 450054</p><p> </p></bio><email xlink:type="simple">dimagun@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/0000-0002-2667-1115</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Стоцкий</surname><given-names>А. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Stotskiy</surname><given-names>A. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Андрей Геннадиевич Стоцкий – мл. науч. сотрудник</p><p>450076, Респ. Башкортостан, г. Уфа, ул. Заки Валиди, 32</p></bio><bio xml:lang="en"><p>Andrey G. Stotskiy – Junior Researcher</p><p>32 Zaki Validi Str., Ufa, Republic of Bashkortostan 450076</p></bio><email xlink:type="simple">stockii_andrei@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0005-7986-8156</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гундерова</surname><given-names>С. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Gunderova</surname><given-names>S. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Софья Дмитриевна Гундерова – студент бакалавриата, лаборант-исследователь</p><p>450076, Респ. Башкортостан, г. Уфа, ул. Заки Валиди, 32;</p><p>450054, Респ. Башкортостан, г. Уфа, пр-т Октября, 71</p></bio><bio xml:lang="en"><p>Sofia D. Gunderova – Undergraduate Student of the Ufa University of Science and Technology, Research Laboratory Assistant </p><p>32 Zaki Validi Str., Ufa, Republic of Bashkortostan 450076;</p><p>71 Oktyabrya Prosp., Ufa, Republic of Bashkortostan 450054</p></bio><email xlink:type="simple">gynderova@mail.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8483-6408</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Аубакирова</surname><given-names>В. Р.</given-names></name><name name-style="western" xml:lang="en"><surname>Aubakirоva</surname><given-names>V. R.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Вета Робертовна Аубакирова – к.т.н., ст. науч. сотрудник</p><p>450076, Респ. Башкортостан, г. Уфа, ул. Заки Валиди, 32</p></bio><bio xml:lang="en"><p>Veta R. Aubakirova – Cand. Sci. (Eng.), Senior Researcher</p><p>32 Zaki Validi Str., Ufa, Republic of Bashkortostan 450076</p></bio><email xlink:type="simple">veta_mr@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6668-3356</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Демин</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Demin</surname><given-names>A. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Алексей Юрьевич Демин – д.т.н., доцент, заведующийкафедрой электронной инженерии</p><p>450076, Респ. Башкортостан, г. Уфа, ул. Заки Валиди, 32</p></bio><bio xml:lang="en"><p>Alexey Yu. Demin – Dr. Sci. (Eng.), Associate Prof., Head of the Department of Electronic Engineering</p><p>32 Zaki Validi Str., Ufa, Republic of Bashkortostan 450076</p></bio><email xlink:type="simple">deminal77@yandex.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Уфимский университет науки и технологий;  Институт физики молекул и кристаллов Уфимского федерального исследовательского центра РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Ufa University of Science and Technology; Institute of Molecule and Crystal Physics of the Ufa Federal Research Centre of the RAS</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Уфимский университет науки и технологий</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Ufa University of Science and Technology</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Уфимский университет науки и технологий; Институт физики молекул и кристаллов Уфимского федерального исследовательского центра РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Ufa University of Science and Technology; Institute of Molecule and Crystal Physics of the Ufa Federal Research Centre of the RAS</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>29</day><month>03</month><year>2024</year></pub-date><volume>30</volume><issue>1</issue><fpage>81</fpage><lpage>92</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Гундеров Д.В., Стоцкий А.Г., Гундерова С.Д., Аубакирова В.Р., Демин А.Ю., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Гундеров Д.В., Стоцкий А.Г., Гундерова С.Д., Аубакирова В.Р., Демин А.Ю.</copyright-holder><copyright-holder xml:lang="en">Gunderov D.V., Stotskiy A.G., Gunderova S.D., Aubakirоva V.R., Demin A.Y.</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://cvmet.misis.ru/jour/article/view/1587">https://cvmet.misis.ru/jour/article/view/1587</self-uri><abstract><p>Исследована эволюция структуры циркониевого сплава Zr–2,5%Nb при деформации методом равноканального углового прессования (РКУП). Показано, что РКУП при температуре 300 °С приводит к повышению прочностных характеристик в 1,4–1,8 раза. Вместе с тем отмечено, что, по сравнению с другими исследованиями, в данном сплаве не происходит полного растворения частиц ниобия, что может быть вызвано замедлением процессов диффузии с понижением температуры деформации до 300 °С. Проведено исследование по предварительной подготовке структуры перед интенсивной пластической деформацией в виде закалки, что позволило сформировать пластинчатую структуру с дополнительными границами. Это способствует измельчению зерна при последующей деформации РКУП. Дополнительно повысить прочность сплава позволяет твердорастворное упрочнение – полное растворение частиц Nb в матрице сплава после закалки. Результатом является повышение в 2,3 раза предела текучести сплава после закалки и РКУП по сравнению с крупнозернистым состоянием.</p></abstract><trans-abstract xml:lang="en"><p>We investigated the microstructure of the Zr–2.5%Nb zirconium alloy after subjecting it to equal-channel angular pressing (ECAP) and found that ECAP at 300 °C increases the strength by 140 to 180 %. Notably, unlike other studies, our alloy did not show complete dissolution of niobium particles, which may be due to the reduced diffusion rates at the lower deformation temperature of 300 °C. Pre-treatment involving quenching before severe plastic deformation was also studied, which developed a lamellar structure introducing additional boundaries that facilitated grain refinement during subsequent ECAP. The strength of the alloy was further enhanced by solid-solution hardening, achieved through the complete dissolution of the Nb particles into the matrix post-quenching. This process resulted in a 2.3-fold increase in yield strength after quenching plus ECAP compared to the initial coarse-grained state.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>микроструктура</kwd><kwd>закалка</kwd><kwd>равноканальное угловое прессование</kwd><kwd>прочностные характеристики</kwd><kwd>частицы Nb</kwd><kwd>циркониевый сплав Zr–2</kwd><kwd>5%Nb</kwd></kwd-group><kwd-group xml:lang="en"><kwd>microstructure</kwd><kwd>quenching</kwd><kwd>equal channel angular pressing</kwd><kwd>strength</kwd><kwd>Nb particles</kwd><kwd>Zr–2.5%Nb zirconium alloy</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено за счет гранта Российского научного фонда № 20-79-10189-П, https://rscf.ru/project/23-79-50039/ Механические испытания и исследования микроструктуры проводились в ЦКП «Нанотех» Уфимского университета науки и технологий.</funding-statement><funding-statement xml:lang="en">This work was carried out with financial support from the Russian Science Foundation under Project № 20-79-10189-П, https://rscf.ru/en/project/23-79-50039/ Mechanical tests and microstructure studу were carried out in the Center for collective use «Nanotech» of Ufa University of Science and Technology.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Chopra D., Gulati K., Ivanovski S. 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