Dislocation based multilevel model for elastic-plastic deformation of polycrystalline materials

International Conference "Modern Technologies and Materials of New Generations"

Chechulina, E.A.^1 ; Trusov, P.V.^1

Department of Mathematical Modeling of Systems and Processes, Perm National Research Polytechnic University, 29 Komsomolsky prospekt, Perm

614990, Russia^1

关键词: Deformation mechanism;    Dislocation structures;    Dislocations densities;    Dynamic strain ageing;    Elastic-plastic deformation;    Evolutionary equation;    Interaction of dislocations;    Portevin-Le Chatelier effects;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/286/1/012023/pdf
DOI  :  10.1088/1757-899X/286/1/012023

来源: IOP

【 摘 要 】

The main aim of the work is to study the Portevin-Le Chatelier effect. The occurrence of the effect is closely connected to the phenomenon of dynamic strain ageing, i.e. the additional pinning of mobile dislocations by foreign atoms diffusing into the dislocation core during their arrest at obstacles, e.g. forest dislocation. The description of interaction of dislocation with impurities plays a great role, that's why it is necessary to develop a several submodels: dislocation submodel for the interaction between dislocations and dislocation submodel for the interaction between dislocations and impurities. The multilevel approach based on using the internal variables, i.e. parameters describing the evolution of meso- and microstructure of the material, was applied to construct the model. The approach to model the dislocation structure is based on introduction of homogeneous dislocations densities on each slip system and obtaining evolutionary equations describing the mechanisms of their generation and interaction. The deformation mechanisms are evaluated and evolution of structural parameters during the process of deformation is analyzed. The dislocation submodel for the interaction between dislocations and impurities will be described in the next papers.