Modeling rapid liquid/solid and solid/liquid phase transformations in Al alloys
Modeling rapid liquid/solid and solid/liquid phase transformations in Al alloys
复制标题
模拟铝合金中的快速液/固和固/液相变
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
M. Buchmann
中科院分区：
文献类型：
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作者：
M. Rettenmayr;M. Buchmann
摘要最近开发的热力学模型描述的“接触条件”（浓度在界面上的两个相邻的阶段）实施的动力学模型的液/固相变。由此产生的集成模型描述了在大范围的凝固前沿速度的相变过程中的液相和固相中的浓度分布。示出了在铝合金中的稳态凝固的例子。计算结果与文献中的实验数据和Aziz的连续增长模型符合得很好。除了早期的模型，瞬态可以描述。一个例子是示出的凝固前沿，是暂时干扰，即。e.使平衡失调结果之一是界面处局部再平衡的时间，其对于凝固为20 μs量级。描述熔化的第一个结果也显示和讨论。
Abstract A recently developed thermodynamic model for describing the ‘contact conditions’ (concentrations at an interface of the two adjacent phases) is implemented in a kinetic model for liquid/solid phase transformations. The resulting integrated model describes the concentration profiles in the liquid and solid phase during the phase transformation over a large range of solidification front velocities. Examples are shown for steady state solidification in aluminum alloys. The results are in good agreement with experimental data from the literature and the well known continuous growth model by Aziz. In addition to earlier models, transient states can be described. An example is shown for a solidification front that is momentarily disturbed, i. e. set off-equilibrium. One of the results is the time for local re-equilibration at the interface which is of the order of 20 μs for solidification. First results for describing melting are also shown and discussed.