Seaweed pattern formation in the non-axially directional solidification of 2D-like and 3D Al-3 wt.% Mg single crystal
Seaweed pattern formation in the non-axially directional solidification of 2D-like and 3D Al-3 wt.% Mg single crystal
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DOI：
10.1016/j.jmst.2022.10.067
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Yumin Wang;Bin Yang;Shuangming Li;Xin-Ling Cao;Z. Liu;Hui-juan Xing
中科院分区：
文献类型：
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作者：
Yumin Wang;Bin Yang;Shuangming Li;Xin-Ling Cao;Z. Liu;Hui-juan Xing
通过控制 Al-3 wt.% Mg 合金定向凝固过程中与取向相关的界面能各向异性，研究了准二维 (2D) 和三维 (3D) 样品中的海藻状微观结构。在这里，我们在 (0 1 1)[111] 和 (2 11)[111] 方向的二维样本中生成不对称形状的海藻和退化海藻图案。在 3D 样品凝固过程中，[111] 方向形成超支化海藻。这些生长模式的比较表明形态特征在性质上是相似的。此外，海藻图案中尖端分裂的间距（λ）和频率（f）遵循关于生长速度的幂律。与 2D 样品相比，3D 样品表现出更小的尖端间距和更高的频率。增长动态与样本量作用之间的这些定量关系值得关注。我们的结果清楚地表明，海藻图案可以在3D金属合金中稳定生存和生长，并且未来探索这种复杂形态的应用是可行的。
The seaweed-like microstructure in quasi-two-dimensional (2D) and three-dimensional (3D) samples is studied by controlling the orientation-dependent interface energy anisotropy during directional solidification of an Al-3 wt.% Mg alloy. Here, we produce asymmetrically shaped seaweed and degenerate seaweed patterns in 2D samples for the (0 1¯ 1)[111] and (2¯ 11)[111] orientations. During solidification in the 3D sample, a hyperbranched seaweed formation prevails for the [111] orientation. The comparison of these growth patterns shows that the morphologic features are qualitatively similar. In addition, the spacing (λ) and frequency (ƒ) of tip splitting in seaweed patterns follow a power law with respect to growth velocity. The 3D sample exhibits a lower tip spacing and higher frequency than the 2D sample. These quantitative relationships between growth dynamics and the role of sample size deserve attention. Our results clearly show that the seaweed pattern could survive and grow stably in 3D metallic alloys, and the exploration of this complex morphology for application is feasible in the future.