Xikuan Guo, Jun Chen, Quanan Li, Xiaoya Chen, Limin Zhu, Panpan Li
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引用次数: 0
Abstract
In this paper, the dynamic recrystallization behavior and microstructure evolution during thermal deformation were simulated by coupling finite element (FE) and cellular automaton (CA) models. The thermal deformation tests were conducted on Mg-8Gd-4Sm-1Zn-0.5Zr alloy at deformation temperatures of 350–470 °C and strain rates of 0.002–1 s−1. The true stress-strain curves were obtained under different deformation conditions, and the microstructure evolution of the alloy was investigated. On this basis, the dynamic recrystallization kinetic model, grain size model, and Laasraoui-Jonas model for CA simulation were established. Meanwhile, the dynamic recrystallization behavior of the alloy under different deformation conditions was simulated by inputting the relevant parameters of the model into the finite element CA simulation software. The simulation results show that the different strains, deformation positions, deformation temperatures, and strain rates have a significant effect on the dynamic recrystallization volume fraction and grain size of the alloy. The predicted DRX volume fraction and grain size are in good agreement with the experimental data, with errors mostly below 10%. These results confirm that the established CA models coupled with the FE analysis can accurately predict the dynamic recrystallization behavior and microstructure evolution of Mg-8Gd-4Sm-1Zn-0.5Zr alloy, the CA-FE coupled method provides accurate theoretical guidance for the dynamic recrystallization behavior study of high-Gd magnesium alloys in thermal deformation. In this paper, the dynamic recrystallization volume fraction model, the recrystallization grain size model, and the Laasraoui-Jonas model of the alloy were established by thermal compression data. The dynamic recrystallization behavior and microstructure evolution were simulated by coupling finite element (FE) and cellular automaton (CA) models during the thermal deformation process. The results show that the established CA models coupled with the FE analysis can accurately predict the variations of the dynamic recrystallization behavior during the thermal deformation of Mg-8Gd-4Sm-1Zn-0.5Zr alloys.
Graphical Abstract
In this paper, the DRX volume fraction model, recrystallized grain size model, and Laasraoui-Jonas model of Mg-8Gd-4Sm-1Zn-0.5Zr alloy have been established by thermal compression tests. By using the CA module in DEFORM-3D coupled with FE simulation, the dynamic recrystallization behavior under different deformation conditions during thermal deformation was investigated, and the microstructure evolution law was analyzed.
期刊介绍：
Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
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