Phase field simulation of solidification under supergravity

Zhang, Zhenhua; Hou, Xu; Zhang, Yong; Wang, Hua; Wang, Jie

doi:10.1007/s10409-022-22031-x

Cited by 3 publications

(4 citation statements)

References 23 publications

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“…In short, a gradient pressure has been established along the direction of supergravity (shown in figure 3), and larger pressure in the lower part makes nucleation much easier and enhances the nucleation rate to a much higher value. Which is consistent well with the theoretical analysis from Chen [12] and phase-field crystal simulation results reported by Hu [14] and Zhang [15] et al It is worth noting that the pressure at each inner point gradually increases and converges to a steady value, this phenomenon implies that supergravity needs a period of time to play its effect. Figure 4 exhibits the distribution of atom number density along the direction of supergravity at different times.…”

Section: Resultssupporting

confidence: 91%

“…The calculated results are shown in figure 9, which clearly shows that the critical growth pressure decreases with the size of nucleus as revealed by thermodynamic analysis, and a good linear relation can be observed. From the perspective of nucleation, this result reflects that pressure can reduce the critical size of nucleuses, which is in line with the results obtained from the phase-field simulation [15]. Therefore, increasing pressure can not only increase the nucleation rate, but also reduce the critical size of nucleuses.…”

Section: Resultssupporting

confidence: 88%

“…Moreover, the results clearly indicate that supergravity can increase the nucleation rate, which agrees well with Chen's model [12]. Using the phase-field method and phasefield crystal approach, Hu [14] and Zhang [15] et al studied the solidification under supergravity. Their results also reproduce the grain refinement phenomenon, and show that increasing the nucleation rate is a way of grain refinement by supergravity.…”

Section: Introductionsupporting

confidence: 73%

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The motion and growth behaviors of nucleuses in Al melt solidified under supergravity condition—molecular dynamics simulation

Gan

Huang

2023

Mater. Res. Express

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That supergravity can refine grains is verified in many materials. However, the underlying mechanism is still an open question. Although some convincing theories have been proposed, including the "crystal rain" theory and the dendrite fragmentation theory, there is a lack of solid evidence, especially from the atomic scale. Based on the presetting nucleuses method, this study investigates the motion and growth behaviors of nucleuses during the solidification process of Al melt under supergravity condition with molecular dynamics simulation. It is found that supergravity builds a gradient pressure in the samples along the direction of supergravity, and the gradient pressure results in the gradient distribution of sample density. The preset nucleuses move directionally along the direction of supergravity forming "crystal rain", while their directional moving velocity decreases due to the increase of buoyancy, which is caused by the increase of melt density in the motion path of the nucleuses. The supergravity-induced pressure not only decreases the critical size of nucleuses but also increases the growth velocity of nucleuses. The research results also indicate that larger nucleuses grow much faster than smaller ones at the same pressure. Owing to the gradient distribution of pressure, the nucleuses grow much faster along the direction of supergravity than other directions and evolve into an “inverted cone” shape. Therefore, these findings show that supergravity can change the nucleation, motion and growth of nucleuses by establishing a gradient pressure in the melt, thus affecting the microstructure of the casting. Our results provide solid support for the “crystal rain” theory and the nucleation rate rising theory from atomic scale.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 88%

Section: Introductionsupporting

confidence: 73%

See 1 more Smart Citation

The motion and growth behaviors of nucleuses in Al melt solidified under supergravity condition—molecular dynamics simulation

Gan

Huang

2023

Mater. Res. Express

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“…The current methods for microstructure simulation of the solidification process of continuous casting are deterministic methods [12], random method [13], and phase-field method [14]. The cellular automaton-finite element (CAFE) method is one of the random methods which combines crystallographic orientation with the dynamics of dendrite tip growth [15] using cellular automaton.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of solidification structures in continuous casting of a thin slab at high casting speed

Chang

Yang

et al. 2022

Ironmaking & Steelmaking

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The solidification structure of a thin slab during the continuous casting process at high casting speed was simulated based on the cellular automaton-finite element (CAFE) model. The simulations were consistent with the solidification structures of actual steel samples, and the influence of the continuous casting process parameters and alloy elements were further studied in detail. The optimum process parameters obtained are as follows: the casting speed at 5.2-5.4 m min −1 , the superheat at 20-25 °C, and the specific water flow at 1.62-1.64 L kg −1 . Meanwhile, the Si content in the thin slab was appropriately increased to refine the grains and improve the production efficiency. This study provides important theoretical data for practical thin slab production, improvement of the continuous casting efficiency, thereby reducing accidents.

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Plastic deformation of magnesium single crystal: a crystal plasticity coupled twinning phase field simulation

Hu,

Xu,

et al. 2024

Acta Mech. Sin.

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Phase field simulation of solidification under supergravity

Cited by 3 publications

References 23 publications

The motion and growth behaviors of nucleuses in Al melt solidified under supergravity condition—molecular dynamics simulation

The motion and growth behaviors of nucleuses in Al melt solidified under supergravity condition—molecular dynamics simulation

Numerical simulation of solidification structures in continuous casting of a thin slab at high casting speed

Plastic deformation of magnesium single crystal: a crystal plasticity coupled twinning phase field simulation

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