›› 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
杨涛, 张静, 龙建, 龙清华, 陈铮
Yang Tao (杨涛), Zhang Jing (张静), Long Jian (龙建), Long Qing-Hua (龙清华), Chen Zheng (陈铮)
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.
中图分类号: (Growth from melts; zone melting and refining)