Description of Aluminum Bicrystal Deformation with Grain Boundary Sliding within Multilevel Constitutive Model Taking into Account the Influence of Alloying Additives

E.R. Sharifullina, A.I. Shveykin, P.V. Trusov

Author details

E.R. Sharifullina
Perm National Research Polytechnic University, Perm, Russian Federation
A.I. Shveykin
Perm National Research Polytechnic University, Perm, Russian Federation
P.V. Trusov
Perm National Research Polytechnic University, Perm, Russian Federation

https://doi.org/10.15593/perm.mech/2025.6.10

Advanced manufacturing and thermomechanical processing technologies of critical industrial products require high precision and reliability of parts under extreme conditions. The internal structure of materials has a significant impact on mechanical and operational characteristics of parts and structures, thus the structural evolution during technological processes has to be considered. Grain boundaries and intermetallic particles play an important role in transforming material structure; the latter are formed due to introduction of alloying elements into the base metal, particles have different sizes, proportion and distribution in materials. Complex patterns of interaction between boundaries and particles with different deformation mechanisms, in particular, intragranular dislocation sliding, grain boundary sliding, can lead to different scenarios depending on temperature-strain rate conditions and material structures. Therefore, during modeling and optimization of complex multi-stage thermomechanical processing and manufacturing, it is necessary to take into account the designated mechanisms and structure characteristics. The article formulates a modified statistical three-level constitutive model based on crystal plasticity taking into account intragranular dislocation sliding, grain boundary sliding and the influence of intermetallic particles of various types. The equations describing deformation mechanisms take into account such particle characteristics as size, volume fraction and shear modulus. The results of numerical experiments for aluminum bicrystals without and with secondary phase particles show a significant influence of the latter on the deformation process.

Keywords

multilevel constitutive modelsmaterial structure evolutiongrain boundary slidingintragranular dislocation slidingintermetallic particles

ОПИСАНИЕ ДЕФОРМИРОВАНИЯ БИКРИСТАЛЛА АЛЮМИНИЯ С РЕАЛИЗАЦИЕЙ ЗЕРНОГРАНИЧНОГО СКОЛЬЖЕНИЯ В РАМКАХ МНОГОУРОВНЕВОЙ КОНСТИТУТИВНОЙ МОДЕЛИ С УЧЕТОМ ВЛИЯНИЯ ЛЕГИРУЮЩИХ ДОБАВОК

Современное проектирование технологических процессов изготовления и термомеханической обработки ответственных промышленных изделий требует высокой точности – вследствие необходимости обеспечения функциональности получаемого изделия в широкодиапазонных и/или экстремальных условиях. При этом одним из важнейших факторов является то, что внутренняя структура материалов оказывает существенное влияние на механические и эксплуатационные характеристики изготовленных из них деталей и конструкций, поэтому при проектировании необходимо учитывать ее изменение в ходе технологических процессов. Одну из ключевых ролей при трансформации структуры материала играют границы зерен и интерметаллидные частицы – последние образуются за счет введения в основной металл легирующих элементов, имеют различные размеры, долю и распределение в материале. Сложные закономерности взаимодействия границ и частиц с носителями различных механизмов деформирования, в частности, внутризеренного дислокационного скольжения, зернограничного скольжения, в зависимости от температурно-скоростных условий и структуры материала могут приводить к различным сценариям. Поэтому для моделирования и оптимизации комплексных многостадийных процессов термомеханической обработки и изготовления изделий необходимо явным образом учитывать обозначенные механизмы и характеристики структуры. В статье предлагается формулировка модифицированной статистической трехуровневой конститутивной модели на основе физической теории упруговязкопластичности с учетом внутризеренного дислокационного скольжения, зернограничного скольжения и влияния интерметаллидных частиц различного типа. В соотношениях для описания действия механизмов деформирования учитываются такие характеристики частиц, как размер, объемная доля и модуль сдвига. Полученные результаты численных экспериментов для бикристалла алюминия без и с учетом частиц вторичных фаз показывают значимое влияние последних на процесс деформирования.

Ключевые слова

многоуровневые конститутивные моделиэволюция структуры материалазернограничное скольжениевнутризеренное дислокационное скольжениеинтерметаллидные частицы

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

Description of Aluminum Bicrystal Deformation with Grain Boundary Sliding within Multilevel Constitutive Model Taking into Account the Influence of Alloying Additives

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