The transition from the dendritic to the seaweed growth morphology during the solidification of deeply undercooled metallic melts
The transition from the dendritic to the seaweed growth morphology during the solidification of deeply undercooled metallic melts
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DOI：
10.1016/j.msea.2003.10.139
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发表时间：
2004-07
期刊：
影响因子：
6.4
通讯作者：
A. Mullis;K. Dragnevski;R. Cochrane
中科院分区：
文献类型：
--
作者：
A. Mullis;K. Dragnevski;R. Cochrane
本文介绍了深过冷纯熔体凝固的相场模型的计算结果。这表明，随着过冷度的增加，发生形态转变，枝晶尖端分裂（双晶形成），导致正常枝晶形态被枝晶“海藻”形态所取代。有人认为，这种海藻形态的重熔引起深过冷熔体中的自发晶粒细化。从一个高纯度的铜样品过冷280 K的实验证据，这似乎显示海藻形态。
The results of a phase-field model for the solidification of deeply undercooled pure melts are presented. This shows that as the undercooling is increased a morphological transition takes place with dendrite tip-splitting (doublon formation) resulting in the normal dendrite morphology being replaced by the dendritic ‘seaweed’ morphology. It is argued that remelting of this seaweed morphology gives rise to spontaneous grain refinement in deeply undercooled melts. Experimental evidence from a high purity Cu sample undercooled by 280K is presented which appears to show the seaweed morphology.