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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">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">1146</article-id><article-id pub-id-type="doi">10.18323/2782-4039-2025-4-74-6</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">Structure and properties of the equiatomic CuAu alloy ordered under a tensile stress of 40 MPa</article-title><trans-title-group xml:lang="ru"><trans-title>Структура и свойства эквиатомного сплава CuAu, упорядоченного под растягивающим напряжением 40 МПа</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0006-3806-9240</contrib-id><name-alternatives><name xml:lang="en"><surname>Podgorbunskaya</surname><given-names>Polina O.</given-names></name><name xml:lang="ru"><surname>Подгорбунская</surname><given-names>Полина Олеговна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>junior researcher of the Strength Laboratory</p></bio><bio xml:lang="ru"><p>младший научный сотрудник лаборатории прочности</p></bio><email>polina.podgorbunskaya@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2407-6280</contrib-id><name-alternatives><name xml:lang="en"><surname>Kazantsev</surname><given-names>Vadim A.</given-names></name><name xml:lang="ru"><surname>Казанцев</surname><given-names>Вадим Аркадьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Physics and Mathematics), senior researcher of the Laboratory of Neutron Matter Research</p></bio><bio xml:lang="ru"><p>кандидат физико-математических наук, старший научный сотрудник лаборатории нейтронных исследований вещества</p></bio><email>vkazantsev@imp.uran.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6438-0725</contrib-id><name-alternatives><name xml:lang="en"><surname>Patselov</surname><given-names>Alexander M.</given-names></name><name xml:lang="ru"><surname>Пацелов</surname><given-names>Александр Михайлович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Physics and Mathematics), senior researcher of the Laboratory of High Pressure Physics</p></bio><bio xml:lang="ru"><p>кандидат физико-математических наук, старший научный сотрудник лаборатории физики высоких давлений</p></bio><email>patselov@imp.uran.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0636-6623</contrib-id><name-alternatives><name xml:lang="en"><surname>Volkov</surname><given-names>Alexey Yu.</given-names></name><name xml:lang="ru"><surname>Волков</surname><given-names>Алексей Юрьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Doctor of Sciences (Engineering), Head of the Strength Laboratory</p></bio><bio xml:lang="ru"><p>доктор технических наук, заведующий лабораторией прочности</p></bio><email>volkov@imp.uran.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">M.N. Mikheev Institute of Metal Physics of the Ural Branch of RAS</institution></aff><aff><institution xml:lang="ru">Институт физики металлов имени М.Н. Михеева Уральского отделения РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-12-29" publication-format="electronic"><day>29</day><month>12</month><year>2025</year></pub-date><issue>4</issue><issue-title xml:lang="ru"/><fpage>69</fpage><lpage>78</lpage><history><date date-type="received" iso-8601-date="2025-12-29"><day>29</day><month>12</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-12-29"><day>29</day><month>12</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Podgorbunskaya P.O., Kazantsev V.A., Patselov A.M., Volkov A.Y.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Подгорбунская П.О., Казанцев В.А., Пацелов А.М., Волков А.Ю.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Podgorbunskaya P.O., Kazantsev V.A., Patselov A.M., Volkov A.Y.</copyright-holder><copyright-holder xml:lang="ru">Подгорбунская П.О., Казанцев В.А., Пацелов А.М., Волков А.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://vektornaukitech.ru/jour/article/view/1146">https://vektornaukitech.ru/jour/article/view/1146</self-uri><abstract xml:lang="en"><p>One of the key challenges in materials science is the search for methods to control the structure and properties of various materials. It was previously established that compression during the ordering of the equiatomic CuAu alloy orients the short c-axes of the crystalline lattice (<italic>L</italic>1<sub>0</sub> superstructure) along the direction of the applied force. However, in practice, thin wires are predominantly used, for which only tensile processing is applicable. This work studied wire specimens of the equiatomic CuAu alloy ordered by cooling from 500 °C at a rate of 12 °C/h under a tensile stress of 40 MPa. A comparison was made with specimens ordered in a free state. For the experiments, miniature grips were designed, and all heat treatments were performed in vacuum. X-ray diffraction analysis revealed that the short c-axes of the tetragonal <italic>L</italic>1<sub>0</sub> superstructure are predominantly located in the plane of the wire cross-section, perpendicular to the direction of the tensile force. Dilatometric investigation revealed that a specimen ordered under tension subsequently contracts (by approximately ~0.8 %) when heated above the phase transformation temperature, while simultaneously expanding in diameter. This effect is explained by the difference in the volumes of the crystalline lattices of the ordered and disordered phases. It was found that during the heating of a specimen ordered under load, the maxima in the temperature derivatives of electrical resistance change in intensity and shift in temperature. A hypothesis has been put forward that ordering the CuAu alloy under a tensile load increases the disordering temperature and alters the thermal stability of the ordered CuAuI and CuAuII phases. The obtained result is consistent with literature data for the CuAu alloy ordered after compressive deformations.</p></abstract><trans-abstract xml:lang="ru"><p>Одна из ключевых задач материаловедения – поиск методов управления структурой и свойствами различных материалов. Ранее было установлено, что сжатие при упорядочении эквиатомного сплава CuAu ориентирует короткие <italic>с</italic>-оси кристаллической решетки (сверхструктура <italic>L</italic>1₀) вдоль действия силы. Однако на практике в основном используются тонкие проволоки, при обработке которых применимо только растяжение. В данной работе изучались проволочные образцы эквиатомного сплава CuAu, упорядоченные путем охлаждения c температуры 500 °С со скоростью 12 град/ч под растягивающим напряжением 40 МПа. Проведено сравнение с образцами, упорядоченными в свободном состоянии. Для проведения экспериментов были сконструированы миниатюрные захваты, все термообработки проводились в вакууме. Рентгеноструктурный анализ показал, что короткие <italic>с</italic>-оси тетрагональной <italic>L</italic>1₀-сверхструктуры преимущественно расположены в плоскости поперечного сечения проволоки перпендикулярно направлению растягивающей силы. При проведении дилатометрического исследования установлено, что образец, упорядоченный под растяжением, при последующем нагреве выше температуры фазового превращения уменьшает свою длину (на ~0,8 %) с одновременным увеличением диаметра. Эффект объясняется отличием объемов кристаллических решеток упорядоченной и разупорядоченной фаз. Установлено, что при нагреве образца, упорядоченного под нагрузкой, максимумы на температурных производных электросопротивления изменяют интенсивность и смещаются по температуре. Выдвинуто предположение, что упорядочение сплава CuAu под растягивающей нагрузкой повышает температуру разупорядочения и изменяет температурную стабильность упорядоченных фаз CuAuI и CuAuII. Полученный результат согласуется с литературными данными для сплава CuAu, упорядоченного после сжимающих деформаций.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Cu-Au alloys</kwd><kwd>phase transformations</kwd><kwd>X-ray diffraction analysis</kwd><kwd>disorder-order transition</kwd><kwd>dilatometry</kwd><kwd>specific electrical resistance</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>сплавы Cu–Au</kwd><kwd>фазовые превращения</kwd><kwd>рентгеноструктурный анализ</kwd><kwd>переход беспорядок→порядок</kwd><kwd>дилатометрия</kwd><kwd>удельное электросопротивление</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The work was carried out within the framework of the state assignment of the Ministry of Science and Higher Education of the Russian Federation for the IMP UB RAS. 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