Open AccessPhase field modeling of the growth and competition behavior of tilted dendrites in directional solidification
Author(s) -
Yaqin Wang,
Jincheng Wang,
Junjie Li
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.118103
Subject(s) - supercooling , directional solidification , materials science , dendrite (mathematics) , tilt (camera) , orientation (vector space) , phase (matter) , position (finance) , condensed matter physics , field (mathematics) , grain boundary , mechanics , optics , geometry , composite material , thermodynamics , microstructure , physics , mathematics , quantum mechanics , pure mathematics , finance , economics
The multi-phase field model is employed to simulate the growth of tilted dendrites during directional solidification. In this simulation, the evolution of a single oriented dendritic array and the overgrowth behavior between two converging grains with different orientations are studied. The simulated results show that the dendritic tip undercooling increases with the tilt angle, which means that the tip position of tilted dendrite is always lower than that of the non-tilted in the same condition. The favorably oriented grain always blocks the unfavorably oriented one in the case of converging growth. However, when the pulling velocity is low, the growth of the preferred crystalline orientation dendrites at the grain boundary is lagged by the immediate unfavorably ones because of the solutal interaction, which may result in the fact that the unfavorably oriented grain overgrows the favorably oriented one.