Coupled quantitative modeling of microstructural evolution and plastic flow during continuous dynamic recrystallization. (September 2022)

• Record Type: Journal Article
• Authors: Chen, Fei; Tian, Xiao; Wu, Guangshan; Zhu, Huajia; Ou, Hengan; Cui, Zhenshan
• Is Part Of: International journal of plasticity. Volume 156(2022)
• Publication Date: 2022-09
• Subjects: Microstructures -- Thermomechanical processes -- Metallic material -- Probability and statistics -- Dynamic recrystallization; cDRX Continuous dynamic recrystallization -- SFE stacking fault energy -- MCA multilevel cellular automaton -- DRV dynamic recovery -- DRX dynamic recrystallization -- dDRX discontinuous DRX -- LABs low-angle grain boundaries -- HABs high-angle grain boundaries -- cDRX¸ continuous DRX -- gDRX geometric DRX -- GM Gourdet–Montheillet -- ISVs internal state variables -- VPSC visco-plastic self-consistent -- GBs grain boundaries -- CA cellular automaton -- 3D three-dimensional -- MCA multilevel CA; Plasticity -- Periodicals; Plasticité -- Périodiques; Plasticity; Periodicals; 620.11233
• DOI: 10.1016/j.ijplas.2022.103372
• Languages: English
• ISSNs: 0749-6419

Abstract

Highlights: A MCA-cDRX model coupled with matrix topology deformation technique was proposed. The evolution of microstructures in hot-working AA7075 aluminum alloy was studied. The macroscopic mechanical response of such materials with a high SFE was studied. The developed simulation framework offers an effective means for visualizing cDRX. Abstract: Continuous dynamic recrystallization (cDRX) dominates microstructural evolution during the hot working of metallic materials with high stacking fault energy (SFE), such as aluminum alloys. However, in reality, a lack of quantitative and visual modeling of the process hinders its widespread application in the hot working process. In this study, using a recently developed multilevel cellular automaton (MCA) that integrates the newly established cell switching rules and topology deformation technique, a novel mesoscale MCA-cDRX model was constructed to investigate the evolution of both microstructures and macroscopic mechanical response in the hot working of AA7075 aluminum alloy. By considering the evolution of dislocation density and the orientation angle of the local cells as the primary clues, the plastic flow, recrystallization kinetics, features of subgrain size and high-angle grain boundaries, and influence of initial matrix characteristics on the cDRX mechanism were analyzed. The model predictions are consistent with the experimental data. Quantitative analysis confirms that the incubation time for the initiation of subgrain formation is significantly short. The fine-grain matrix and high initial volume fraction of low-angle grain boundaries can significantly accelerate the progress of cDRX owing to a stronger accumulation of dislocations in the dislocation cell walls through the climb and cross-slip mechanisms in the deformed aluminum alloy. The subgrain size is dependent on the Zener-Hollomon parameter. The developed simulation framework offers an effective means to allow the visualization of the cDRX.