Two-dimensional phase-field study of competitive grain growth during directional solidification of polycrystalline binary alloy
Two-dimensional phase-field study of competitive grain growth during directional solidification of polycrystalline binary alloy
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DOI：
10.1016/j.jcrysgro.2016.01.036
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发表时间：
2016-05-15
影响因子：
1.8
通讯作者：
Aoki, Takayuki
中科院分区：
文献类型：
--
作者：
Takaki, Tomohiro;Ohno, Munekazu;Aoki, Takayuki
采用二维相场法对二元多晶合金定向凝固过程中生长晶体的选择进行了数值模拟。为了加速模拟，使用东京工业大学的GPU丰富的超级计算机TSUBAME2.5进行并行图形处理单元（GPU）模拟。二十模拟与五组不同的种子取向分布和四个不同的温度梯度覆盖的树枝状和细胞生长区域的组合进行。异常的晶粒选择现象，其中不利取向的晶粒优先生长，而不是有利取向的晶粒，经常被观察到。这种不寻常的选择在细胞结构中比在树枝状结构中更显著。(C)2016爱思唯尔B.V.保留所有权利。
Selections of growing crystals during directional solidification of a polycrystalline binary alloy were numerically investigated using two-dimensional phase-field simulations. To accelerate the simulations, parallel graphics processing unit (GPU) simulations were performed using the GPU-rich supercomputer TSUBAME2.5 at the Tokyo Institute of Technology. Twenty simulations with a combination of five sets of different seed orientation distributions and four different temperature gradients covering dendritic and cellular growth regions were performed. The unusual grain selection phenomenon, in which the unfavorably oriented grains preferentially grow instead of the favorably oriented grains, was observed frequently. The unusual selection was more remarkable in the cellular structure than in the dendritic structure. (C) 2016 Elsevier B.V. All rights reserved.