Phase field crystal study of the crystallization modes within the two-phase region

Using the phase field crystal approach, the crystallization process within the liquid-solid coexistence region is inves- tigated for a square lattice on an atomic scale. Two competing growth modes, i.e., the diffusion-controlled growth through long-range atomic migration in liquid and the diffusionl...

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Bibliographic Details
Published in:Chinese physics B 2014-08, Vol.23 (8), p.572-578
Main Authors: Yang, Tao, Zhang, Jing, Long, Jian, Long, Qing-Hua, Chen, Zheng
Format: Article
Language:English
Subjects:
Anisotropy
Crystal lattices
Crystallization
Crystals
Density
Diffusion
Diffusion rate
Lattice vibration
原子尺度
扩散控制
晶体形态
正方形晶格
界面迁移
相位
相区域
结晶过程
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Summary:Using the phase field crystal approach, the crystallization process within the liquid-solid coexistence region is inves- tigated for a square lattice on an atomic scale. Two competing growth modes, i.e., the diffusion-controlled growth through long-range atomic migration in liquid and the diffusionless growth through local atom rearrangement, which give rise to two completely different crystallization behaviors, are compared. In the diffusion-controlled regime, the interface migrates in a layerwise manner, leading to a gradual change of crystal morphology from truncated square to four-fold symmetric dendrite with the increase of driving force. For the diffusionless growth mode, a single crystal with no significant density change occupies the whole system at a faster rate while exhibiting a small growth anisotropy. The competition between these two modes is also discussed from the key input of the phase field crystal model： the correlation function.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/23/8/088109