首页|Dendritic tip selection during solidification of alloys:Insights from phase-field simulations
Dendritic tip selection during solidification of alloys:Insights from phase-field simulations
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The effect of undercooling △T and the interface energy anisotropy parameter ε4 on the shape of the equiaxed dendritic tip has been investigated by using a quantitative phase-field model for solidification of binary alloys.It was found that the tip radius p increases and the tip shape amplitude coefficient A4 decreases with the increase of the fitting range for all cases.The dendrite tip shape selection parameter σ*decreases and then stabilizes with the increase of the fitting range,and σ*increases with the increase of ε4.The relationship between σ* and ε4 follows a power-law function σ* ∝ εα4,and α is independent of △T but dependent on the fitting range.Numerical results demonstrate that the predicted σ*is consistent with the curve of microscopic solvability theory(MST)for ε4＜0.02,and σ* obtained from our phase-field simulations is sensitive to the undercooling when ε4 is fixed.
phase-field simulationsdendritic structureinterface energy anisotropytip shape selection param-eter
张清杰、邢辉、王灵杰、翟薇
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School of Physical Science and Technology,Northwestern Polytechnical University,Xi'an 710072,China
Research & Development Institute of Northwestern Polytechnical University in Shenzhen,Shenzhen 518063,China
National Key Research and Development Program of ChinaShenzhen Science and Technology Program
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