Journal
JOURNAL OF CRYSTAL GROWTH
Volume 442, Issue -, Pages 14-24Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jcrysgro.2016.01.036
Keywords
Computer simulation; Dendrites; Directional solidification; Crystal morphology
Funding
- Iron and Steel Institute of Japan (ISIJ)
- Japan Society for the Promotion of Science (JSPS) [25289006, 25289266]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) [26220002]
- Joint Usage/Research Center for Interdisciplinary Large-scale Information Infrastructures (JHPCN)
- High Performance Computing Infrastructure (HPCI) in Japan
- Computational Materials Science Initiative (CMSI)
- Grants-in-Aid for Scientific Research [15K20995, 26220002, 25289006] Funding Source: KAKEN
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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.
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