Phase field simulation of dendrite growth under convection

金属学报(英文版), 2010, 23(2): 121-128.

^1, , ^2, , ^3, , ^4,

1.State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials,Lanzhou University of Technology,Lanzhou 730050,China

2.State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials,Lanzhou University of Technology,Lanzhou 730050,China

3.State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials,Lanzhou University of Technology,Lanzhou 730050,China

4.State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials,Lanzhou University of Technology,Lanzhou 730050,China

基金项目: the Doctoral Fund of Lanzhou University of Technology(SB01200606) the Lanzhou Science and Technology Bureau(2009-1-9)

Phase field simulation of dendrite growth under convection

Yutian DING ^1, , Xunfeng YUAN ^2, , Tingbiao GUO ^3, , Yong HU ^4,

1.State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials,Lanzhou University of Technology,Lanzhou 730050,China

2.State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials,Lanzhou University of Technology,Lanzhou 730050,China

3.State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials,Lanzhou University of Technology,Lanzhou 730050,China

4.State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials,Lanzhou University of Technology,Lanzhou 730050,China

Keywords： Phase field method

The phase-field model coupled with a flow field was used to simulate the solidification of pure materials by the finite difference method. The effects of initial crystal radius,the space step and the interface thickness on the dendrite growth were studied. Results indicate that the grain grows into an equiaxial dendrite during free flow and into a typical branched structure under forced flow. The radius of an initial crystal can affect the growth of side-branches but not the stability of the dendrite's tip whenan appropriate value is assigned to it. With an increase in space steps, side-branches appear at the upstream of the longitudinal principal branch and they grow rapidly.With an increase in the interface thickness, the trunk of the longitudinal upstream and lateral principal branches grow longer and become more slender while the number of secondary branches increases.

参考文献

[1]	H.-J. DIEPERS;C. BECKERMANN;I. STEINBACH .SIMULATION OF CONVECTION AND RIPENING IN A BINARY ALLOY MUSH USING THE PHASE-FIELD METHOD[J].Acta materialia,1999(13):3663-3678.
[2]	C.W. Lan;C.J. Shih .Phase field simulation of non-isothermal free dendritic growth of a binary alloy in a forced flow[J].Journal of Crystal Growth,2004(1/3):472-482.

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Phase field simulation of dendrite growth under convection

参考文献