Deformation of dendrites by fluid flow during rapid solidification
Deformation of dendrites by fluid flow during rapid solidification
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DOI：
10.1016/s0921-5093(00)01477-5
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发表时间：
2001-05
期刊：
影响因子：
6.4
通讯作者：
A. Mullis;D. J. Walker;S. Battersby;R. Cochrane
中科院分区：
文献类型：
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作者：
A. Mullis;D. J. Walker;S. Battersby;R. Cochrane
枝晶和它们的母体熔体之间的机械相互作用通常被认为是微不足道的。然而，在快速凝固过程中，可能存在产生机械损伤所需的高流速和非常细的枝晶的双重条件。一个模型的皮肤应力所造成的流动周围的一个家庭的真实形状的树枝状。我们发现，在一个狭窄的过冷度范围内的局部最小的尖端半径，机械变形是可能的。实验证据来自Cu-3 wt.% Sn合金过冷73 K，这似乎显示出变形枝晶结构的证据。
Mechanical interactions between dendrites and their parent melt are normally considered insignificant. However, during rapid solidification the twin conditions of high flow velocities and very fine dendrites required to produce mechanical damage may exist. A model for the skin stress resulting from flow around a family of realistically shaped dendrites is presented. We find that within a narrow undercooling range about a local minimum in the tip radius, mechanical deformation is likely. Experimental evidence is presented from a Cu–3wt.% Sn alloy undercooled by 73K which appears to show evidence of a deformed dendritic structure.