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arXiv 2104.09928cond-mat.mtrl-sci
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二元系向无扩散凝固转变的动力学phase diagram

Kinetic phase diagram for a binary system near the transition to diffusionless solidification

G. L. Buchbinder

摘要:

在局部非平衡方法的框架内,考虑了二元混合物在界面速度$V$接近于液相$V_D$的扩散速度的区域中的快速凝固。在此高速区,不用平衡相图的概念,导出了代表动力学相图的响应函数“温度-速度”的解析表达式。分析了无拖曳和有拖曳时界面的运动模式。结果表明,拖曳效应可以伴随着局部界面温度最大值在$V = V_D$。

英文摘要:

The rapid solidification of a binary mixture in the region of the interface velocities $V$ close to the diffusion speed in the bulk of the liquid phase $V_D$ is considered within the framework of the local nonequilibrium approach. In this high-speed region the derivation of the analytical expression for the response function "temperature-velocity" representing kinetic phase diagram is given without using the concept of the equilibrium phase diagram. The modes of movement of the interface both without and with the drag effect are analyzed. It is shown that the drag effect can be accompanied by a local interface temperature maximum at $V = V_D$.

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