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Analysis of free dendritic growth considering both relaxation effect and effect of nonisothermal and nonisosolutal interface

机译:同时考虑弛豫效应和非等温和非等温界面的自由树突生长

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Through considering both the relaxation effect of local nonequilibrium solute diffusion in bulk liquid and the effect of nonisothermal and nonisosolutal nature of the solid-liquid interface, a further improved version of free dendritic growth model was proposed, for binary alloys. Comparative analysis indicates that the effect of the nonisothermal nature of the interface is significant and this effect should be taken into account in modeling the free dendritic growth. It is also concluded that the effect of the nonisosolutal nature of interface is very slight and really negligible. Thus, the simplified version of free dendritic growth model taking into account the nonisothermal nature of the interface and with an isosolutal interface assumption is reasonable. Furthermore, experimental comparison demonstrates that it is necessary to introduce the diffusion relaxation effect for achieving a good agreement between the model predictions with the available experiment data, especially at high undercoolings, for the Cu70Ni30, alloy. (C) 2019 Elsevier Ltd. All rights reserved.
机译:通过考虑散装液体中局部非平衡溶质扩散的弛豫效果以及固液界面的非等温和非等温性质的影响,针对二元合金提出了进一步改进的自由枝晶生长模型。对比分析表明,界面的非等温性质的影响是显着的,在模拟自由树突生长时应考虑该影响。还得出结论,界面的非隔离性质的影响非常小,实际上可以忽略不计。因此,考虑到界面的非等温特性并采用等界面界面假设,自由树突状生长模型的简化版本是合理的。此外,实验比较表明,有必要引入扩散弛豫效应,以使模型预测与可用的实验数据(尤其是在过冷度较高的情况下,对于Cu70Ni30合金)在可用的实验数据之间取得良好的一致性。 (C)2019 Elsevier Ltd.保留所有权利。

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