Computer simulation of strain-induced boundaries formation and evolution during plastic deformation of polycrystals

Author details

V.N. Perevezentsev
Mechanical Engineering Research Institute of the Russian Academy of Science – Branch of Federal Research Center « A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences», Nizhny Novgorod, Russian Federation
J.V. Svirina
Mechanical Engineering Research Institute of the Russian Academy of Science – Branch of Federal Research Center « A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences», Nizhny Novgorod, Russian Federation

https://doi.org/10.15593/perm.mech/2025.6.03

The conditions of formation of strain induced boundaries during plastic deformation of a polycrystal are analyzed using the method of discrete dislocations dynamics simulation. Formation of deformation boundaries is due to the appearance of rotational mesodefects — junction disclinations at intergranular boundaries and at grain junctions. Accumulation of these defects is caused by the difference in plastic strains of adjacent grains, as well as by the inhomogeneity of deformation in the volume of individual grains. The method of computer simulation shows that an increase in the strength of mesodefects and elastic fields activates the processes of accommodative deformation, which result in the formation of secondary dislocation structures in the form of broken dislocation boundaries. The simulation results show that the strength of the junction disclination monotonically increases during plastic deformation and, upon reaching the value of true deformation ε ≈ 0.2, tends to reach a constant value depending on the magnitude of external stress. The strength of the junction disclination is the greater, the greater the value of the external stress. The saturation is explained by the redistribution and alignment of the flows of lattice dislocations incoming in the intergranular boundaries of the tricrystal from the volume of conjugated grains, which leads to the equalization of the strain rates between neighboring grains. The effect of the orientation of the extension axis on the patterns of formation and morphology of the broken dislocation boundary is studied. It is shown that the forming strain induced boundary exhibits a tendency to lie along the direction of the extension axis, which corresponds to the experimental data. The obtained results are of great importance for the development of the physical theory of fragmentation, which underlies the technologies for obtaining fine-grained and submicrocrystalline materials using various schemes of severe plastic deformation.

Keywords

strain-induced boundariesfragmentationcomputer simulation of dislocation ensemblejunction disclinationsplastic deformation

КОМПЬЮТЕРНОЕ МОДЕЛИРОВАНИЕ ФОРМИРОВАНИЯ ГРАНИЦ ДЕФОРМАЦИОННОГО ПРОИСХОЖДЕНИЯ ПРИ ПЛАСТИЧЕСКОЙ ДЕФОРМАЦИИ ПОЛИКРИСТАЛЛОВ

Методом компьютерного моделирования динамики дискретных дислокаций проанализированы условия формирования границ деформационного происхождения в процессе пластической деформации поликристалла. Формирование деформационных границ связано с появлением мезодефектов ротационного типа — стыковых дисклинаций на межзеренных границах и в стыках зерен. Накопление этих дефектов обусловлено различием собственных пластических деформаций смежных зерен, а также неоднородностью деформации в объеме отдельных зерен. Методом компьютерного моделирования показано, что возрастание мощности мезодефектов и упругих полей активирует процессы аккомодационной деформации, результатом которых становится формирование вторичных дислокационных структур в виде оборванных дислокационных границ. Результаты моделирования показывают, что мощность стыковой дисклинации монотонно возрастает в процессе пластической деформации и при достижении величины истинной деформации ε = 0,2 имеет тенденцию к выходу на постоянное значение, зависящее от величины внешнего напряжения. Мощность стыковой дисклинации оказывается тем больше, чем больше величина внешнего напряжения. Выход на насыщение объясняется перераспределением и выравниванием потоков решеточных дислокаций, попадающих на межзеренные границы трикристалла из объема сопрягающихся зерен, что приводит к выравниванию скоростей деформации между соседними зернами. Исследовано влияние ориентации оси растяжения на закономерности формирования и морфологию оборванной дислокационной границы. Показано, что формирующаяся деформационная граница демонстрируют тенденцию к залеганию вдоль направления оси растяжения, что соответствует экспериментальным данным. Полученные результаты имеют важное значение для развития физической теории фрагментации, лежащей в основе технологий получения мелкозернистых и субмикрокристаллических материалов с использованием различных схем интенсивной пластической деформации.

Ключевые слова

границы деформационного происхожденияфрагментациякомпьютерное моделирование ансамбля дислокацийстыковые дисклинациипластическая деформация

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Article information

Published: 29 December 2025
Issue date: 29 December 2025
Issue: No. 6 (2025)