Abstract Using the phase field crystal approach, the crystallization process within the liquid-solid coexistence region is investigated 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.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51174168 and 51274167) and the Foundation for Fundamental Research of Northwestern Polytechnical University, China (Grant No. JC20120222).
Corresponding Authors:
Yang Tao
E-mail: 420929211@163.com
Cite this article:
Yang Tao (杨涛), Zhang Jing (张静), Long Jian (龙建), Long Qing-Hua (龙清华), Chen Zheng (陈铮) Phase field crystal study of the crystallization modes within the two-phase region 2014 Chin. Phys. B 23 088109
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