MeltsMeltsРасплавы0235-01063034-5715The Russian Academy of Sciences66125010.31857/S0235010623050092VTDNAOArticlesСтатьиSYNTHESIS AND STRUCTURE OF FOUR TiZrVNb AND FIVE-COMPONENT TiZrHfVNb REFRACTORY HIGH-ENTROPY ALLOYSПолучение и структура четырех TiZrVNb и пятикомпонентных TiZrHfVNb тугоплавких высокоэнтропийных сплавовSipatovI. S.СипатовИ. С.ivan.sipatov@gmail.comPetrovaS. А.ПетроваС. А.ivan.sipatov@gmail.comIgnatievaE. V.ИгнатьеваЕ. В.ivan.sipatov@gmail.comRempelA. A.РемпельА. А.ivan.sipatov@gmail.comInstitute of Metallurgy, Ural Branch of the RASИнститут металлургии Уральского отделения РАН01092023545446625022025Copyright ©; 2023, И.С. Сипатов, С.А. Петрова, Е.В. Игнатьева, А.А. РемпельCopyright ©; 2023, И.С. Сипатов, С.А. Петрова, Е.В. Игнатьева, А.А. Ремпель2023И.С. Сипатов, С.А. Петрова, Е.В. Игнатьева, А.А. РемпельИ.С. Сипатов, С.А. Петрова, Е.В. Игнатьева, А.А. Ремпельhttps://journals.eco-vector.com/0235-0106/article/view/661250

High-entropy alloys attract researcher’s attention due to the presence of a set of new properties. The paper considers the factors affecting the structure of high-entropy alloys (HEAs) based on the elements Ti, Zr, Hf, V, and Nb. The structure data of four-component Ti25Zr25V25Nb25 and five-component Ti20Zr20Hf20V20Nb20 alloys, which were obtained under the same melting and cooling conditions in an arc furnace, are presented. The data of the EDX analysis showed that the chemical composition of the alloys corresponded to the nominal one. Analysis of micrographs of the ingots surface allows us to conclude that the applied melting mode led to overheating of the four–component alloy, but not for the five-component one. It was experimentally found that the primary formation of the four-component alloy occurs faster than that of the five-component one, but further remelting under overheating conditions leads to multiphase structure formation. The maximum content of BCC solid solution (98%) in Ti25Zr25V25Nb25 alloy was achieved during the first remelting, another phase was FCC solid solution (2%). The maximum content of BCC solid solution (95%) in Ti20Zr20Hf20V20Nb20 alloy was obtained by repeated remelting, BCC, HCP solid solutions, and the Laves phase were presented in the amount of 3% or less. The crystal lattice parameters of the BCC main phases for the Ti25Zr25V25Nb25 and Ti20Zr20Hf20V20Nb20 alloys were 3.270 and 3.362 Å, respectively. It was established that to obtain refractory HEAs with a single-phase structure it is important both fulfilment of thermodynamic conditions and correct choice of time-temperature conditions of melting and crystallization for each specific alloy composition.

Высокоэнтропийные сплавы привлекают внимание исследователей благодаря наличию комплекса новых свойств. В работе рассмотрены факторы, влияющие на структуру высокоэнтропийных сплавов (ВЭС) на основе элементов Ti, Zr, Hf, V и Nb. Приведены данные о структуре четырехкомпонентного Ti25Zr25V25Nb25 и пятикомпонентного Ti20Zr20Hf20V20Nb20 сплавов, полученных при одинаковых режимах плавки и охлаждения в дуговой печи. Данные энергодисперсионного химического анализа показали, что химический состав сплавов соответствовал номинальному. На основании анализа микрофотографий поверхности слитков сделан вывод о том, что использованный режим плавки приводил к перегреву четырехкомпонентного сплава, а пятикомпонентного – нет. Экспериментально обнаружено, что первичное формирование четырехкомпонентного сплава происходит быстрее, чем пятикомпонентного, однако дальнейший переплав в условиях перегрева приводит к образованию многофазной структуры. Максимальное содержание ОЦК твердого раствора (98%) в сплаве Ti25Zr25V25Nb25 было достигнуто при первом переплаве, а другой фазой (2%) был ГЦК твердый раствор. Максимальное содержание ОЦК твердого раствора (95%) в сплаве Ti20Zr20Hf20V20Nb20 было получено при повторном переплаве, а ОЦК, ГПУ твердые растворы и фаза Лавеса присутствовали в количестве не более 3%. Параметры кристаллической решетки основных фаз с ОЦК структурой для сплавов Ti25Zr25V25Nb25 и Ti20Zr20Hf20V20Nb20 имели соответственно следующие значения – 3.270 и 3.362 Å. Установлено, что наряду с соблюдением термодинамических условий при получении тугоплавких ВЭСов с однофазной структурой важен выбор термовременных условий плавки и кристаллизации для каждого конкретного состава сплава.

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