Abstract

Numerical simulation of the solidification of a modified (Al–Cu) aluminum melt in a cylindrical crucible is performed. The model used describes thermodynamic processes, heterogeneous nucleation, and solidification of α and β components of the melt. A crystalline phase nucleates at the surface of spherical particles upon cooling of the melts below the liquidus temperature that changes in accordance with the concentration of dissolved alloying component. The relation between the supercooling and size of nuclei formed at the surface of nanosized particles is demonstrated. During cooling of the melt from the liquidus temperature to the eutectic temperature, the α component of the melt solidifies; during subsequent cooling, the eutectic solidification of the β component takes place. The nucleation conditions, solidification rate, and solidification time were found to differ substantially within the melt. The reliability of the suggested model is confirmed by comparison of numerical computation results with physical experiment data.

中文翻译：

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改性熔体中形核和凝固过程的数值研究

摘要

对圆柱形坩埚中改性 (Al-Cu) 铝熔体的凝固进行了数值模拟。使用的模型描述了熔体中 α 和 β 组分的热力学过程、异相成核和凝固。当熔体冷却到液相线温度以下时，结晶相在球形颗粒的表面成核，液相线温度根据溶解的合金成分的浓度而变化。证明了过冷度与纳米粒子表面形成的核大小之间的关系。在熔体从液相线温度冷却到共晶温度的过程中，熔体的α组分凝固；在随后的冷却过程中，β组分发生共晶凝固。成核条件、凝固速率、发现熔体中的凝固时间和凝固时间有很大差异。通过数值计算结果与物理实验数据的比较，证实了建议模型的可靠性。