| Title |
Dendritic Growth in an Undercooled Liquid Containing Randomly Distributed Second Particles |
| Authors |
김원태(Won Tae Kim); 김성균(Seong Gyoon Kim) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Phase field model; Dendritic growth; Composites; Solidification |
| Abstract |
Phase field modeling is applied to simulate the scale of solidification microstructure of particular reinforced composite material. Dendritic growth in an undercooled liquid containing randomly distributed second particles has been simulated by using phase field modeling for the first time. The particles ahead of advancing solid/liquid interface disturbed the diffusion field and act as a noise, causing the change in growing direction as well as the occurrence of side branching. The composites show finer scale of solidification microstructure (segregation scale) Than the monolithic alloy. The microstructures of the composites are dependent on the relative scales of primary arm spacing(λ_1) in well-developed dendrite, secondary arm spacing(λ_2) near a growing tip and average distance(λ_p) between particles. In case of λ_p≥λ_1, the scale of segregation in solidification microstructure is mainly controlled by λ_1, while it is controlled by λ_2 in case of λ_p＜λ_2. Also fractal patterns appears when dendrite grows in an undercooled liquid containing secondary particles with λ_p＜λ_1. |