Simulation of faceted dendrite growth of non-isothermal alloy in forced flow by phase field method |
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| Authors: | Zhi Chen Li-mei Hao Chang-le Chen |
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| Affiliation: | (1) Key Laboratory of Automobile Materials of Ministry of Education and Department of Materials Science and Engineering, Jilin University, No. 142 Renmin Street, Changchun, 130025, P.R. China;(2) Department of Materials Science and Engineering, Inner Mongolia Polytechnic University, No. 226 Aimin Road, Huhhot, 010062, P.R. China; |
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| Abstract: | Numerical simulation based on a new regularized phase field model was presented to simulate the dendritic shape of a non-isothermal alloy with strong anisotropy in a forced flow. The simulation results show that a crystal nucleus grows into a symmetric dendrite in a free flow and into an asymmetry dendrite in a forced flow. As the forced flow velocity is increased, both of the promoting effect on the upstream arm and the inhibiting effects on the downstream and perpendicular arms are intensified, and the perpendicular arm tilts to the upstream direction. With increasing the anisotropy value to 0.14, all of the dendrite arms tip velocities are gradually stabilized and finally reach their relative saturation values. In addition, the effects of an undercooling parameter and a forced compound flow on the faceted dendrite growth were also investigated. |
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| Keywords: | phase field method forced flow strong anisotropy faceted dendrite steady state tip velocity |
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