Al-Cu合金瞬态定向凝固过程中的间距特征
Spacing Characterization in Al-Cu Alloys Directionally Solidified Under Transient Growth Conditions
摘要：
研究了Al-Cu合金在瞬态生长条件下定向凝固的间距选择。新的实验结果表明，枝晶间距与凝固速率的演变几乎是逐步的方式，与以前的理论预测兰格和同事。动态生长条件与实验结果相近的定向凝固相场模拟结果证实了这一点。枝晶臂间距的变化被证明是一致的枝晶不稳定性局限，最初，子域，而不是整个系统。这是由于生长条件的快速变化，这阻止了系统作为一个整体而适应，而是在一系列准孤立的域中。
英文摘要：
We study spacing selection in directional solidification of Al-Cu alloys under transient growth conditions. New experimental results are presented which reveal that dendritic spacing versus solidification rate evolves in an almost step-wise fashion, consistent with previous theoretical predictions of Langer and co-workers. Phase field simulations of directional solidification with dynamical growth conditions approximating those in the experiments confirm this behavior. Changes in dendrite arm spacing is shown to be consistent with dendrite instabilities confined, initially, to sub-domains, rather than the entire system. This is due to the rapid variation in growth conditions, which prevent the system from adapting as a whole but, rather, in a succession of quasi-isolated domains.
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