Dendritic solidification of highly undercooled dilute alloys

Dendritic solidification of highly undercooled dilute alloys
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高过冷稀合金的枝晶凝固

DOI:
10.3139/146.111792
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发表时间:
2019-08
影响因子:
0.8
通讯作者:
Hua Hou
Hua Hou
中科院分区:
材料科学4区
文献类型:
--
作者:
Xiaolong Xu;Yuhong Zhao;Hua Hou

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摘要基于现有的枝晶非平衡生长模型和稀合金局部非平衡溶质捕获模型,建立了稀合金枝晶快速凝固模型。在本工作中,我们考虑了非平衡枝晶生长模型的结果,凝固的稀释过冷熔体具有不同的浓度,以揭示浓度效应。在考虑流体流动效应的基础上,应用扩展的化学过热模型预测了稀相过冷熔体的枝晶重熔过程。该模型预测,当枝晶生长速度超过界面液相溶质扩散速度时,枝晶重熔将突然消失。
Abstract Based on a current non-equilibrium dendrite growth model and a local non-equilibrium solute trapping model for dilute alloys, a model for rapid dendritic solidification of dilute alloys was developed. In the present work, we considered the results of the non-equilibrium dendrite growth model for solidification of dilute undercooled melts with different concentrations in order to reveal the concentration effect. Incorporating the fluid flow effect, we applied an extended chemical superheating model to predict the dendrite remelting of dilute undercooled melts. This model predicted that the dendrite remelting will disappear abruptly once the dendrite growth velocity exceeded the solute diffusion velocity in the liquid phase at the interface.
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