Simulation of dynamic recrystallization of a magnesium alloy with a cellular automaton method coupled with adaptive activation energy and matrix deformation topology

Wang, Sibing; Wang, Xu; Wu, He; Yuan, Ranxu; Jin, Xueze; Shan, Debin

doi:10.1051/mfreview/2021009

Cited by 2 publications

(2 citation statements)

References 15 publications

(21 reference statements)

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“…At each time step, non-recrystallization cells or low-order recrystallized grains located at the grain boundary are taken as the target cells, and the growth distance ( L) of the recrystallized grains to the target cells is calculated as follows:

where V is the growth rate, and the calculation formula is:

where P is the driving force and can be calculated as follows [ 22 ]:

where

is the dislocation density of adjacent cells;

is the dislocation density of recrystallized grains respectively;

is the radius of the recrystallization grain.…”

Section: Ca Modelmentioning

confidence: 99%

Understanding Effects of Ultrasonic Vibration on Microstructure Evolution in Hot Forming Process via Cellular Automata Method

et al. 2022

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Compared with traditional forming technology, ultrasonic vibration-assisted plastic forming technology can improve the forming conditions and obtain better surface quality of the workpiece. However, the mechanism and theory of ultrasonic action have not formed a unified understanding. In this paper, ultrasonic-assisted thermal forming technology is taken as the research object. Through experimental research combined with cellular automata methods, based on the dislocation density model, nucleation and growth model, and dynamic recrystallization growth rule, a theoretical model for microstructure simulation of the ultrasonic-assisted thermal forming process was established. By introducing the ultrasonic energy field into the thermal forming process and correcting thermal activation energy and dynamic recovery coefficient, the reasons for flow stress reduction of 9310 steel and the influence of temperature, strain rate, and vibration amplitude on recrystallization were analyzed from the microscopic scale. The results show that the introduction of ultrasonic vibration reduces the dislocation activation energy, promotes dynamic recrystallization behavior, and finally leads to the reduction of flow stress. With an increase in vibration amplitude, the average grain size decreases faster, the recrystallization volume fraction increases faster, the stress decreases larger, and the ultrasonic softening phenomenon becomes more obvious. Decreasing the strain rate will promote the occurrence of dynamic recrystallization, the volume fraction and average grain size of dynamic recrystallization will increase, and the true stress will decrease.

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where V is the growth rate, and the calculation formula is:

where P is the driving force and can be calculated as follows [ 22 ]:

where

is the dislocation density of adjacent cells;

is the dislocation density of recrystallized grains respectively;

is the radius of the recrystallization grain.…”

Section: Ca Modelmentioning

confidence: 99%

Understanding Effects of Ultrasonic Vibration on Microstructure Evolution in Hot Forming Process via Cellular Automata Method

et al. 2022

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“…Understanding DRX in different materials is important for various reasons. In metals, it is essential in the automotive or aviation industries, where, for instance, it is used for grain refinement to make stronger and tougher metals and alloys (Wang et al., 2021; Zhang et al., 2022). In naturally deformed rocks, the relationship between the mean recrystallized grain size and flow stresses is used to constrain paleo‐stresses (Stipp & Tullis, 2003; Twiss, 1977).…”

Section: Introductionmentioning

confidence: 99%

The Onset of Recrystallization in Polar Firn

Ogunmolasuyi,

Murdza,

Baker

2023

Geophysical Research Letters

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Constraining the onset of dynamic recrystallization (DRX) and its effects on the mechanical properties of firn is crucial for firn densification modeling. To that end, samples from a depth of 13 m in a Summit, Greenland (72°35′N, 38°25′W) firn core were subjected to creep tests at −14°C and 0.21 MPa compressive stress to strains of 7%, 12%, 18%, and 29%. Microstructural analyses using thin‐section imaging and microcomputed x‐ray tomography (micro‐CT) revealed smaller grain sizes, reduced specific surface area and connectivity, and increased density in relation to reduced porosity as the strain increases. These results show that DRX occurs in firn under creep, with strain‐induced boundary migration (SIBM) and nucleation and growth starting at ∼7%. DRX leads to elongated grains, reduced grain size, and the development of a preferred crystallographic orientation, indicating that DRX occurs by both SIBM and nucleation and growth.

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Simulation of dynamic recrystallization of a magnesium alloy with a cellular automaton method coupled with adaptive activation energy and matrix deformation topology

Cited by 2 publications

References 15 publications

Understanding Effects of Ultrasonic Vibration on Microstructure Evolution in Hot Forming Process via Cellular Automata Method

Understanding Effects of Ultrasonic Vibration on Microstructure Evolution in Hot Forming Process via Cellular Automata Method

The Onset of Recrystallization in Polar Firn

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