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Phase field crystal study of the crystallization modes within the two-phase region |
Yang Tao (杨涛), Zhang Jing (张静), Long Jian (龙建), Long Qing-Hua (龙清华), Chen Zheng (陈铮) |
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University (NPU), Xi'an 710072, China |
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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.
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Received: 13 December 2013
Revised: 18 January 2014
Accepted manuscript online:
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PACS:
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81.10.Fq
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(Growth from melts; zone melting and refining)
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64.70.dg
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(Crystallization of specific substances)
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61.50.Ah
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(Theory of crystal structure, crystal symmetry; calculations and modeling)
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07.05.Tp
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(Computer modeling and simulation)
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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
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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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