›› 2014, Vol. 23 ›› Issue (8): 88109-088109.doi: 10.1088/1674-1056/23/8/088109

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

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

杨涛, 张静, 龙建, 龙清华, 陈铮   

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University (NPU), Xi'an 710072, China
  • 收稿日期:2013-12-13 修回日期:2014-01-18 出版日期:2014-08-15 发布日期:2014-08-15
  • 基金资助:
    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).

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)   

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University (NPU), Xi'an 710072, China
  • Received:2013-12-13 Revised:2014-01-18 Online:2014-08-15 Published:2014-08-15
  • Contact: Yang Tao E-mail:420929211@163.com
  • Supported by:
    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).

摘要: 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.

关键词: phase field crystal, diffusion-controlled, diffusionless, dendrite

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.

Key words: phase field crystal, diffusion-controlled, diffusionless, dendrite

中图分类号:  (Growth from melts; zone melting and refining)

  • 81.10.Fq
64.70.dg (Crystallization of specific substances) 61.50.Ah (Theory of crystal structure, crystal symmetry; calculations and modeling) 07.05.Tp (Computer modeling and simulation)