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NUMERICAL SIMULATION OF SUCCINONITRITE DENDRITIC GROWTH IN A FORCED FLOW

Acta Metallurgica Sinica(English Letters) 2008年第6期21卷 444-450页

作者： Z. Chen C.L. Chen L.M. Hao School of Science Department of Applied Physics Shaanxi Key Laboratory of Condensed Matter Structures and Properties Northwestern Polytechnical University Xi＇an 710072 China School of Science Xi＇an University of Science ＆ Technology Xi＇an 710054 China

Numerical simulation based on phase field method is performed to describe solidification process of pure material in a free or forced flow. The evolution of the interface is showed, and the effects of mesh grid and flow velocity on succinonitrite shape are studied. These results indicate that crystal grows into an equiaxial dendrite in a free flow and into an asymmetrical dendritic in a forced flow. With increasing flow velocity, the upstream dendritic arm tip grows faster and the downstream arm grows slower. However, the evolution of the perpendicular tip has no significant change. In addition, mesh grid has no influence on dendritic growth shape when mesh grid is above 300×300.

关键词： Phase field method Forced flow Dendritic Succinonitrite tip velocity

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Distinctions of dendritic behavior influenced by constant pressure and periodic pressure

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China Foundry 2021年第2期18卷 94-100页

作者： Shan Shang Zhi-peng Guo Zhi-qiang Han Xin-yu Zhang Yi-nuo Cheng Jun Li State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China School of Vehicle and Mobility Tsinghua UniversityBeijing 100084China Beijing Supreium Co. Ltd.Beijing 100089China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Beijing Jingwei Hirain Technologies Co. Inc.Beijing 100191China

The distinctions of dendritic morphology and sidebranching behavior when solidified under atmosphere pressure,constant pressure which is higher than atmosphere pressure (hereinafter referred to as constant pressure) and periodic pressure were investigated using 3-D phase field *** growing at atmosphere pressure,side branches (secondary dendritic arms) are *** solidified under constant pressure with a relatively high value,side branches are much more luxuriant,with more developed high-order side *** applied with periodic pressure,resonant sidebranching happens,leading to many more regular side branches and the smallest secondary dendritic arm spacing (SDAS) in the three *** significant difference in dendritic morphology is associated with tip velocity modulated by total undercooling including pressure and temperature *** the case of constant pressure,tip velocity increases linearly with total undercooling,and it varies periodically in periodic pressure *** different variation trend in tip velocity is the reason for the distinct dendrite growth behavior in different *** the phenomenon in constant pressure case where the dendrite grows faster with higher pressure,the dendrite grows slower under periodic pressure with higher amplitude,resulting in less developed primary dendrite and side *** is influenced by tip remelting due to low undercooling or even negative *** is revealed that the accelerated velocity of tip remelting increases with the decline of *** greater the amplitude of periodic pressure,the faster the tip remelting velocity during one *** is the reason why the average tip velocity decreases with the rise of amplitude of periodic pressure.

关键词： periodic pressure sidebranching amplitude tip velocity undercooling phase field method

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Phase field method simulation of faceted dendrite growth with arbitrary symmetries

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Transactions of Nonferrous Metals Society of China 2018年第2期28卷 290-297页

作者：陈志陈佩巩贺贺段培培郝丽梅金克新西北工业大学理学院应用物理系西安710129 西北工业大学软件与微电子学院西安710129 西安科技大学理学院应用物理系西安710054

A numerical simulation based on a regularized phase field model is developed to describe faceted dendrite growth morphology. The effects of mesh grid, anisotropy, supersaturation and fold symmetry on dendrite growth morphology were investigated, respectively. These results indicate that the nucleus grows into a hexagonal symmetry faceted dendrite. When the mesh grid is above 640×640, the size has no much effect on the shape. With the increase in the anisotropy value, the tip velocities of faceted dendrite increase and reach a balance value, and then decrease gradually. With the increase in the supersaturation value, crystal evolves from circle to the developed faceted dendrite morphology. Based on the Wulff theory and faceted symmetry morphology diagram, the proposed model was proved to be effective, and it can be generalized to arbitrary crystal symmetries.

关键词： phase field method strong anisotropy faceted dendrite Wulff theory tip velocity symmetry

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