blackmetИзвестия высших учебных заведений. Черная МеталлургияIzvestiya. Ferrous Metallurgy0368-07972410-2091National University of Science and Technology "MISIS"10.17073/0368-0797-2024-3-311-317blackmet-2734Research ArticleМАТЕРИАЛОВЕДЕНИЕMATERIAL SCIENCEМиграция границ зерен и изменение механических свойств сплава Fe – 10Ni – 20Cr при радиационном облученииGrain boundary migration and mechanical properties altering in Fe – 10Ni – 20Cr alloy under irradiationhttps://orcid.org/0000-0002-1423-3724КрыжевичД. С.KryzhevichD. S.

Дмитрий Сергеевич Крыжевич, к.ф.-м.н., научный сотрудник лаборатории компьютерного конструирования материалов

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

Dmitrii S. Kryzhevich, Cand. Sci. (Phys.-Math.), Research Associate of the Laboratory of Computer-Aided Design of Materials

2/4 Akademiches­kii Ave., Tomsk 634021, Russian Federation

kryzhev@ispms.ruhttps://orcid.org/0000-0002-3765-5911КорчугановА. В.KorchuganovA. V.

Александр Вячеславович Корчуганов, к.ф.-м.н., научный сотрудник лаборатории компьютерного конструирования материалов

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

Aleksandr V. Korchuganov, Cand. Sci. (Phys.-Math.), Research Associate of the Laboratory of Computer-Aided Design of Materials

2/4 Akademiches­kii Ave., Tomsk 634021, Russian Federation

avkor@ispms.ruhttps://orcid.org/0000-0001-8988-1040ЗольниковК. П.ZolnikovK. P.

Константин Петрович Зольников, д.ф.-м.н., главный научный сотрудник лаборатории компьютерного конструирования материалов

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

Konstantin P. Zolnikov, Dr. Sci. (Phys.-Math.), Chief Researcher of the Laboratory of Computer-Aided Design of Materials

2/4 Akademiches­kii Ave., Tomsk 634021, Russian Federation

kost@ispms.ruИнститут физики прочности и материаловедения Сибирского отделения РАНРоссияInstitute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of SciencesRussian Federation202416062024673311317Copyright © Крыжевич Д.С., Корчуганов А.В., Зольников К.П., 20242024Крыжевич Д.С., Корчуганов А.В., Зольников К.П.Kryzhevich D.S., Korchuganov A.V., Zolnikov K.P.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/2734

Проведено молекулярно-динамическое изучение механизмов миграции наклонных симметричных границ ∑5(210)[001] и ∑5(310)[001] в бикристаллических образцах Fe – 10Ni – 20Cr при радиационном облучении. Плотность радиационных дефектов растет достаточно быстро вплоть до дозы ~0,02 сна и затем выходит на насыщение. Это обусловлено уравновешиванием скоростей генерации и аннигиляции радиационных дефектов. Показано, что на ранней стадии облучения границы зерен начинали стохастически отклоняться от исходных положений вследствие взаимодействия с каскадами атомных смещений и поглощения дефектов структуры. В процессе облучения область границ зерен утолщалась и становилась шероховатой. С ростом дозы облучения увеличивались размеры кластеров точечных дефектов (тетраэдов дефектов упаковки и дислокационных петель). Взаимодействие с крупными кластерами точечных дефектов привело к образованию изгибов на изначально плоских поверхностях границ зерен. При малых расстояниях между границами высокая движущая сила между изогнутыми поверхностями существенно увеличивала скорости сближения границ зерен. Показано, что средние скорости миграции границ зерен до их непосредственного взаимодействия друг с другом составляли примерно 0,8 м/с. В результате сближения границы зерен аннигилировали, потенциальная энергия образца скачкообразно уменьшилась, и зерна объединились. Для аннигиляции границ зерен ∑5(310)[001] потребовалась в два раза большая доза облучения по сравнению с границей зерен ∑5(210)[001]. Непосредственное взаимодействие границ зерен друг с другом скачкообразно увеличивает скорости их миграции из-за возникновения движущей силы со стороны изогнутых участков поверхностей границ зерен. Изучено влияние дозы радиационного облучения на особенности деформационного поведения образцов при одноосных растяжениях. Показано, что с ростом дозы облучения предел упругости быстро понижается и выходит на насыщение при дозе облучения ~0,01 сна.

Mechanisms of ∑5(210)[001] and ∑5(310)[001] symmetrical tilt grain boundaries migration in bicrystall Fe – 10Ni – 20Cr samples under irradiation were investigated by means of molecular dynamics method. The density of radiation defects grows quite quickly up to a dose of ~0.02 dpa and then reaches saturation. This is due to balancing of the radiation defects generation and annihilation rates. It is shown that at the early stage of irradiation, grain boundaries began to deviate stochastically from their initial positions due to interaction with cascades of atomic displacements and absorption of structural defects. During irradiation, the grain boundary region thickened and became rough. With an increase in the radiation dose, size of the clusters of point defects (tetrahedrons of stacking faults and dislocation loops) increased. Interaction with large clusters of point defects led to the formation of bends on initially flat surfaces of grain boundaries. At small distances between the boundaries, the high driving force between the curved surfaces of grain boundaries significantly increased the rates of their approach. The average migration rates of grain boundaries before their direct interaction with each other were approximately 0.8 m/s. As a result of their approach, the grain boundaries were annihilated, the potential energy of the sample decreased abruptly, and the grains merged. The annihilation of ∑5(310)[001] grain boundaries required twice the radiation dose compared to the ∑5(210)[001] grain boundaries . The direct interaction of grain boundaries with each other abruptly increased the velocity of their migration due to the emergence initiation of a driving force from the curved sections of the grain boundary surfaces. Influence of the radiation dose on deformation behavior features of the samples under uniaxial strains was studied. With an increase in the radiation dose, the elastic limit decreased rapidly and reached saturation at an irradiation dose of ~0.01 dpa.

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