期刊
ACTA MATERIALIA
卷 60, 期 15, 页码 5501-5507出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2012.07.012
关键词
Orientation; Dendrite formation; Crystal growth; Computer simulation; Phase-field crystal model
资金
- Nature Science Foundation of China [10974228, 51071128]
- National Basic Research Program of China [2011CB610401]
- fund of the State Key Laboratory of Solidification Processing in NWPU [SKLSP201001]
- Program for New Century Excellent Talents in University
- Doctorate Foundation of Northwestern Polytechnical University [CX201106]
Using the phase-field crystal model, we investigate the orientation selection of the cubic dendrite growth at the atomic scale. Our simulation results reproduce how a face-centered cubic (fcc) octahedral nucleus and a body-centered cubic (bcc) truncated-rhombic dodecahedral nucleus choose the preferred growth direction and then evolve into the dendrite pattern. The interface energy anisotropy inherent in the fcc crystal structure leads to the fastest growth velocity in the < 100 > directions. New {111} atomic layers prefer to nucleate at positions near the tips of the fcc octahedron, which leads to the directed growth of the fcc dendrite tips in the < 100 > directions. A similar orientation selection process is also found during the early stage of bcc dendrite growth. The orientation selection regime obtained by phase-field crystal simulation is helpful for understanding the orientation selection processes of real dendrite growth. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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