SIMULATION OF NH4Cl-H2O DENDRITIC GROWTH IN DIRECTIONAL SOLIDIFICATION

doi:10.3724/SP.J.1037.2010.00642

Acta Metall Sin

2011, Vol. 47

Issue (5): 620-627 DOI: 10.3724/SP.J.1037.2010.00642

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SIMULATION OF NH₄Cl-H₂O DENDRITIC GROWTH IN DIRECTIONAL SOLIDIFICATION

SHI Yufeng, XU Qingyan, GONG Ming, LIU Baicheng

Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Department of Mechanical Engineering, Tsinghua University, Beijing 100084

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SHI Yufeng XU Qingyan GONG Ming LIU Baicheng. SIMULATION OF NH₄Cl-H₂O DENDRITIC GROWTH IN DIRECTIONAL SOLIDIFICATION. Acta Metall Sin, 2011, 47(5): 620-627.

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Abstract Studying the microstructure evolution mechanism of directional solidification by numerical simulation has the directive significance in the solidification theory and practical production. Taking account of constitutional undercooling, curvature undercooling, preferred growth orientation coefficient, temperature gradient and pulling velocity, a modified cellular automaton (MCA) model has been developed to simulate the influence of different temperature gradient directions, different preferred growth orientations and different pulling velocities on the morphologies of columnar dendrites. The simulation results well describe the influence of inclination angle between temperature gradient and growth direction on primary dendrite arm spacing (PDAS). Meanwhile the simulation results also reproduce the competitive growth of columnar dendrites with different preferred growth orientations and the splitting of the columnar dendritic tips. For the purpose of verifying this model, the relevant experiments have been carried out on an NH₄Cl-H₂O solution. The experimental results are compared critically with the simulation ones from the MCA model.

Key words: cellular automaton NH₄Cl-H₂O transparent alloy directional solidification numerical simulation

Received: 01 December 2010

ZTFLH:

O781

Fund:

Supported by National Natural Science Foundation of China (No.10477010), National Basic Research Program of China (Nos. 2005CB724105 and
2011CB706801), High Technology Research and Development Program of China (No.2007AA04Z141) and Important National Science & Technology Specific Projects (No.2009ZX04006-041-04)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00642 OR https://www.ams.org.cn/EN/Y2011/V47/I5/620

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