blackmetИзвестия высших учебных заведений. Черная МеталлургияIzvestiya. Ferrous Metallurgy0368-07972410-2091National University of Science and Technology "MISIS"10.17073/0368-0797-2023-1-57-61blackmet-2479Research ArticleМАТЕРИАЛОВЕДЕНИЕMATERIAL SCIENCEФормирование зеренной структуры и микротвердости интерметаллического соединения Ni\(_{3}\)Al в результате СВС-экструзииGrain structure formation and microhardness of Ni\(_{3}\)Al intermetallic compound fabricated by SHS extrusionhttps://orcid.org/0000-0002-3204-250XАкимовК. О.AkimovK. O.

Кирилл Олегович Акимов, младший научный сотрудник лаборатории физики консолидации порошковых материалов

Россия, 634055, Томск, пр. Академи­ческий, 2/4

Kirill O. Akimov, Junior Researcher of the Laboratory of Physics of Consolidation of Powder Materials

2/4 Akademiches­kii Ave., Tomsk, 634055, Russian Federation

akimov_ko@ispms.ruhttps://orcid.org/0000-0002-8003-271XИвановК. В.IvanovK. V.

Константин Вениаминович Иванов, д.ф.-м.н., ведущий научный сотрудник лаборатории физики консолидации порошковых материалов

Россия, 634055, Томск, пр. Академи­ческий, 2/4

Konstantin V. Ivanov, Dr. Sci. (Phys.-Math.), Leading Researcher of the Laboratory of Physics of Consolidation of Powder Materials

2/4 Akademiches­kii Ave., Tomsk, 634055, Russian Federation

ikv@ispms.ruФигуркоМ. Г.FigurkoM. G.

Марина Григорьевна Фигурко, инженер лаборатории физики консолидации порошковых материалов

Россия, 634055, Томск, пр. Академи­ческий, 2/4

Marina G. Figurko, Engineer of the Laboratory of Physics of Consolidation of Powder Materials

2/4 Akademiches­kii Ave., Tomsk, 634055, Russian Federation

figurko.marina@mail.ruhttps://orcid.org/0000-0003-1776-1212ОвчаренкоВ. Е.OvcharenkoV. E.

Владимир Ефимович Овчаренко, д.т.н., профессор, главный научный сотрудник лаборатории композиционных материалов

Россия, 634055, Томск, пр. Академи­ческий, 2/4

Vladimir E. Ovcharenko, Dr. Sci. (Eng.), Prof., Chief Researcher of the Laboratory of Composite Materials

2/4 Akademiches­kii Ave., Tomsk, 634055, Russian Federation

Институт физики прочности и материаловедения Сибирского отделения РАНРоссияInstitute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of SciencesRussian Federation2023010320236615767Copyright © Акимов К.О., Иванов К.В., Фигурко М.Г., Овчаренко В.Е., 20232023Акимов К.О., Иванов К.В., Фигурко М.Г., Овчаренко В.Е.Akimov K.O., Ivanov K.V., Figurko M.G., Ovcharenko V.E.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://fermet.misis.ru/jour/article/view/2479

В рамках работы на примере микротвердости исследована возможность улучшения прочностных свойств интерметаллического соединения Ni3Al путем уменьшения среднего размера его зерна. Исследуется влияние деформации реагирующей смеси при самораспространяющемся высокотемпературном синтезе (СВС) на размер зерна и микротвердость интерметаллического соединения Ni3Al. СВС-экструзию проводили на экспериментальном стенде, позволяющем непрерывно контролировать параметры синтеза. Одним из ключевых факторов, влияющих на характеристики зеренной структуры и микротвердость, является степень деформации продукта синтеза. Увеличение диаметра экструзионного отверстия от 3 до 5 мм приводит к увеличению максимального линейного перемещения плунжера пресса вследствие более легкого выхода материала через отверстие большего диаметра. Предполагается, что при этом имеют место уменьшение сопротивления деформированию материала при приложении давления, увеличение степени деформации материала внутри пресс-формы и ее снижение в экструдированном материале. В результате средний размер зерна Ni3Al, оставшегося в объеме пресс-формы после синтеза, уменьшается на 40 % (от 7 до 5 мкм), а прошедшего через экструзионное отверстие – возрастает в два раза (от 3 до 6 мкм). По сравнению с Ni3Al, полученным методом СВС-компактирования, средний размер зерна экструдированного Ni3Al меньше в 5,6 раза (17 и 3 мкм соответственно). Уменьшение среднего размера зерна экструдированного Ni3Al приводит к увеличению микротвердости на 600 МПа. Полученные результаты позволяют разработать рекомендации по получению интерметаллидов и сплавов на их основе с мелким размером зерна и высокой микротвердостью.

In this paper we studied the possibility to enhance the microhardness of Ni3Al intermetallic compound by reducing the average grain size and the effect of the mixture deformation during self-propagating high-temperature synthesis (SHS) on the Ni3Al grain size and microhardness. We used an SHS extrusion test bench to continuously monitor the synthesis variables. One of the key factors affecting the grain structure and microhardness is deformation rate of the synthesis product. Increasing the extrusion nozzle diameter from 3 to 5 mm results in a longer displacement of the press plunger since it takes less force to extrude the material through the larger diameter orifice. It is assumed that the resistance to deformation under pressure decreases, while the deformation rate increases for the material in the mold, and decreases for the extruded material. As a result, the average grain size of Ni3Al remaining in the mold after synthesis decreases by 40 % (from 7 to 5 μm), while the grain size of the extruded material is doubled (from 3 to 6 μm). Compared to Ni3Al produced by SHS compaction, the average grain size of extruded Ni3Al is 82 % less (17 and 3 μm, respectively). Reducing the average grain size of extruded Ni3Al leads to a 600 MPa increase in microhardness. The results obtained may assist the development of guidelines for fine grain, high microhardness intermetallide/alloy manufacturing.

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The authors declare that there are no conflicts of interest present.