Orientation selection process during the early stage of cubic dendrite growth: A phase-field crystal study

Sai Tang, Zhijun Wang, Yaolin Guo, Jincheng Wang, Yanmei Yu, Yaohe Zhou

科研成果: 期刊稿件文章同行评审

49 引用 (Scopus)

摘要

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 〈1 0 0〉 directions. New {1 1 1} 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 〈1 0 0〉 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.

源语言英语
页(从-至)5501-5507
页数7
期刊Acta Materialia
60
15
DOI
出版状态已出版 - 9月 2012

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