Phase field modeling of dendritic coarsening during isothermal solidification |
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Authors: | Zhang Yutuo Zhang Wanning Wang Tie Fan Liyan Wang Chengzhi |
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Affiliation: | 1. Shenyang Ligong University, Shenyan8 110159, China 2. Shenyang Government Investment Project Evaluation Center, Shenyang 110014, China 3. Dalian Jinzhou Cable Co., Ltd., Liaoning Baolin Group, Dal ian 116100, China |
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Abstract: | Dendritic coarsening in Al-2mol%Si alloy during isothermal solidification at 880K was investigated by phase field modeling.Three coarsening mechanisms operate in the alloy:(a) melting of small dendrite arms; (b) coalescence of dendrites near the tips leading to the entrapment of liquid droplets; (c) smoothing of dendrites.Dendrite melting is found to be dominant in the stage of dendritic growth,whereas coalescence of dendrites and smoothing of dendrites are dominant during isothermal holding.The simulated results provide a better understanding of dendrite coarsening during isothermal solidification. |
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Keywords: | phase field dendritic coarsening Al-Si alloy isothermal solidification |
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